US Gold Corporation 22,000,000 Shares Common Stock (no par value per share) Underwriting Agreement May 12, 2009

US Gold Corporation

22,000,000 Shares

Common Stock

(no par value per share)

Underwriting Agreement

May 12, 2009

GMP Securities L.P.

Xxxxxxx Xxxx & Company, LLC

c/o GMP Securities L.P.

000 Xxxx Xxxxxx Xxxx

Xxxxx 000

Xxxxxxx XX X0X 0X0

Ladies and Gentlemen:

US Gold Corporation, a corporation organized under the laws of State of Colorado (the “Company”), proposes to sell to GMP Securities L.P. (“GMP”), and through its Agent Affiliate in the United States, Xxxxxxxxx XxXxxxxx Corp., and Xxxxxxx Xxxx & Company, LLC (“Xxxxxxx,” together with GMP, the “Underwriters”) an aggregate of twenty two million (22,000,000) shares of common stock, no par value per share (“Common Stock”), of the Company (said shares to be issued and sold by the Company being hereinafter called the “Underwritten Securities”). The Company also proposes to grant to the Underwriters an option to purchase up to an additional three million three hundred thousand (3,300,000) shares of Common Stock to cover over-allotments (the “Option Securities”; the Option Securities, together with the Underwritten Securities, being hereinafter called the “Securities”).

Any reference herein to the Registration Statement, the Base Prospectus, any Preliminary Prospectus, the Final Prospectus or any Issuer Free Writing Prospectus shall be deemed to refer to and include the documents incorporated by reference therein pursuant to Item 12 of Form S-3 that were filed under the Exchange Act on or before the Effective Date of the Registration Statement or the issue date of the Base Prospectus, any Preliminary Prospectus, the Final Prospectus or any Issuer Free Writing Prospectus, as the case may be (the “Incorporated Documents”); and any reference herein to the terms “amend,” “amendment” or “supplement” with respect to the Registration Statement, the Base Prospectus, any Preliminary Prospectus or the Final Prospectus shall be deemed to refer to and include the filing of any document under the Exchange Act after the Effective Date of the Registration Statement or the issue date of the Base Prospectus, any Preliminary Prospectus or the Final Prospectus, as the case may be, deemed to be incorporated therein by reference pursuant to the Securities Act of 1933, as amended.

The Company has filed the Registration Statement, the related multijurisdictional disclosure system preliminary shelf prospectus (the “Preliminary Canadian MJDS Base Prospectus”) and the related multijurisdictional disclosure system final shelf prospectus (the

“Canadian MJDS Base Prospectus”), with securities regulatory authorities in each of the Canadian provinces other than Quebec (such provinces being referred to herein as the “Canadian Jurisdictions” and such regulators being referred to herein as the “Canadian Regulators”), pursuant to and in each case in accordance with the Canadian Securities Administrators’ National Instrument 71-101 - The Multijurisdictional Disclosure System (“NI 71-101”) and applicable securities laws in the Canadian Jurisdictions (collectively, the “MJDS Rule”), and has received a receipt for the Preliminary Canadian MJDS Base Prospectus and the Canadian MJDS Base Prospectus from or on behalf of each of the Canadian Regulators.

Certain terms used herein are defined in Section 18 hereof.

1. Representations and Warranties.

The Company represents and warrants to, and agrees with, each Underwriter as set forth below in this Section 1:

(a) The Company meets the requirements for use of Form S-3 under the Act and has prepared and filed with the Commission a shelf registration statement (file number 333-157998) on Form S-3, including a related base prospectus, for registration under the Act of the offering and sale of the Securities. The Registration Statement and any amendments thereto, each in the form heretofore delivered or to be delivered to you and excluding exhibits to the Registration Statement and any amendment thereto have been declared effective by the Commission. The Company may have filed with the Commission pursuant to Rule 424(b), one or more Preliminary Prospectuses relating to the Securities, each of which has previously been furnished to you. The Company will file with the Commission the Final Prospectus relating to the Securities in accordance with Rule 424(b). As filed, the Final Prospectus shall contain all information required by the Act, and, except to the extent that the Underwriters shall agree in writing to a modification, shall be in all substantive respects in the form furnished to you prior to the Execution Time or, to the extent not completed at the Execution Time, shall contain only such specific additional information and other changes (beyond that contained in the Base Prospectus and any Preliminary Prospectus) as the Company has advised you, and to which you have agreed, prior to the Execution Time, will be included or made therein. The Registration Statement, at the Execution Time, meets the requirements set forth in Rule 415(a)(1)(x). The initial Effective Date of the Registration Statement was not earlier than the date three years before the Execution Time. The Company has not received from the Commission any order preventing or suspending the effectiveness of the Registration Statement or the use of the Base Prospectus, any Preliminary Prospectus or any Issuer Free Writing Prospectus and no proceedings for such purpose have been initiated or, to the Company’s knowledge, are contemplated by the Commission. The Company has not received from the Canadian Regulators any order preventing or suspending the use of the Canadian MJDS Base Prospectus or any Preliminary Canadian MJDS Supplement and no proceedings for such purpose have been initiated or, to the Company’s knowledge, are contemplated by the Canadian Regulators.

(b) The Company meets and will at all times during the offer and sale of Securities pursuant to this underwriting agreement (the “Agreement”) continue to meet the requirements and remain qualified for use of NI 71-101 and has, prior to the Execution Time, prepared, executed and filed the Preliminary Canadian MJDS Base Prospectus, the Canadian MJDS Base Prospectus and the Preliminary Canadian MJDS Supplement thereto in each of the Canadian Jurisdictions, along with all other required documents, and has received a receipt from or on behalf of each of the Canadian Regulators for the Canadian MJDS Base Prospectus and has fulfilled all requirements to enable the Securities to be offered for sale and sold to the public in the Canadian Jurisdictions.

(c) On the Effective Date, the Registration Statement did, and when the Final Prospectus is first filed in accordance with Rule 424(b) and on the Closing Date (as defined herein) and on any date on which Option Securities are purchased, if such date is not the Closing Date (a “settlement date”), the Final Prospectus (and any supplement thereto) will, comply in all material respects with the applicable requirements of the Act and the Exchange Act; on the date of filing with the Canadian Regulators, the Preliminary Canadian MJDS Base Prospectus, the Canadian MJDS Base Prospectus and the Preliminary Canadian MJDS Supplement did, and when the Final Canadian MJDS Supplement is first filed in accordance with the MJDS Rule and on the Closing Date and any settlement date, the Final Canadian MJDS Supplement (and any supplement thereto) will, comply in all material respects with the applicable requirements of Canadian Securities Laws; on the date of filing with the Canadian Regulators and at the Execution Time, the Canadian MJDS Base Prospectus did not and will not contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary in order to make the statements therein not misleading; on the Effective Date and at the Execution Time, the Registration Statement did not and will not contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary in order to make the statements therein not misleading; and on the date of any filing pursuant to Rule 424(b) or NI 71-101 and on the Closing Date and any settlement date, the Preliminary Prospectus, the Final Prospectus, the Preliminary Canadian MJDS Supplement and the Final Canadian MJDS Supplement (in each case, together with any supplement thereto) will not include any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided, however, that the Company makes no representations or warranties as to the information contained in or omitted from the Registration Statement or the Final Prospectus (or any supplement thereto) or the Canadian MJDS Base Prospectus or the Final Canadian MJDS Supplement (or any supplement thereto) in reliance upon and in conformity with information furnished in writing to the Company by or on behalf of any Underwriter specifically for inclusion in the Registration Statement or the Final Prospectus (or any supplement thereto) or the Canadian MJDS Base Prospectus or the Final Canadian MJDS Supplement (or any supplement thereto), as the case may be, it being understood and agreed that the only such information furnished by or on

behalf of any Underwriter consists of the information described as such in the letter agreement between you and the Underwriters dated the date hereof. Each Incorporated Document, at the time each of the documents listed in this Section 1(c) was filed, or will be filed, with the Commission or at the time such document became or becomes effective, as applicable, complied or will comply, in all material respects, with the requirements of the Exchange Act and did not or will not, as applicable, include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

(d) The Preliminary Canadian MJDS Base Prospectus, as of its filing date, did not contain any misrepresentation (as defined by Canadian Securities Laws) and constituted full, true and plain disclosure of all material facts relating to the Securities and the Company and its subsidiaries, taken as a whole, as required by Canadian Securities Laws; the Canadian MJDS Base Prospectus, as of its filing date did not contain any misrepresentation (as defined by Canadian Securities Laws) and constituted full, true and plain disclosure of all material facts relating to the Securities and the Company and its subsidiaries, taken as a whole, as required by Canadian Securities Laws; the Preliminary Canadian MJDS Supplement (or any supplement thereto) as of its filing date, did not contain any misrepresentation (as defined by Canadian Securities Laws) and constituted full, true and plain disclosure of all material facts relating to the Securities and the Company and its subsidiaries, taken as a whole, as required by Canadian Securities Laws; and the Final Canadian MJDS Supplement (or any supplement thereto), as of its filing date, the Closing Date and any settlement date, will not contain any misrepresentation (as defined by Canadian Securities Laws) and will constitute full, true and plain disclosure of all material facts relating to the Securities and the Company and its subsidiaries, taken as a whole, as required by Canadian Securities Laws; provided, however, in each case that the Company makes no representations or warranties as to the information contained in or omitted from the Preliminary Canadian MJDS Base Prospectus, the Preliminary Canadian MJDS Supplement (or any supplement thereto), the Canadian MJDS Base Prospectus or the Final Canadian MJDS Supplement (or any supplement thereto) in reliance upon and in conformity with information furnished in writing to the Company by or on behalf of any Underwriter specifically for inclusion in the Preliminary Canadian MJDS Base Prospectus, the Preliminary Canadian MJDS Supplement (or any supplement thereto), the Canadian MJDS Base Prospectus or the Final Canadian MJDS Supplement (or any supplement thereto), as the case may be, it being understood and agreed that the only such information furnished by or on behalf of any Underwriter consists of the information described as such in the letter agreement between you and the Underwriters dated the date hereof. For the purposes of this Section 1(d), the Preliminary MJDS Canadian Base Prospectus, the Preliminary Canadian MJDS Supplement (or any supplement thereto), the Canadian MJDS Base Prospectus or the Final Canadian MJDS Supplement (or any supplement thereto) shall include the Incorporated Documents.

(e) The Preliminary Canadian MJDS Supplement and Final Canadian MJDS Supplement conforms and will conform to the Preliminary Prospectus and Final Prospectus, as applicable, except for such deletions and additions as are permitted or required under applicable Canadian Securities Laws.

(f) As of the Applicable Time, the Closing Date, and each settlement date, the Disclosure Package (i) complies or will comply in all material respects with the requirements of the Act and the Exchange Act, and applicable Canadian Securities Laws, as applicable and (ii) does not and will not contain any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. Sub-section (ii) of the preceding sentence does not apply to statements in or omissions from the Disclosure Package based upon and in conformity with written information furnished to the Company by any Underwriter specifically for use therein, it being understood and agreed that the only such information furnished by or on behalf of any Underwriter consists of the information described as such in the letter agreement between you and the Underwriters dated the date hereof.

(g) Within 180 days prior to the execution of this Agreement, the Company has not, directly or indirectly, offered or sold any Securities by means of any “prospectus” (within the meaning of the Act) or used any “prospectus” (within the meaning of the Act) in connection with the offer and sale of the Securities, in each case other than any Preliminary Prospectus and any Issuer Free Writing Prospectus, if any; the Company has not, directly or indirectly, prepared, used or referred to any Issuer Free Writing Prospectus except in compliance with Rule 163 or with Rules 164 and 433 under the Act. Each Issuer Free Writing Prospectus does not include any information that conflicts with the information contained in the Registration Statement, including any document incorporated therein by reference pursuant to the Act and any prospectus supplement deemed to be a part thereof that has not been superseded or modified. The foregoing sentence does not apply to statements in or omissions from any Issuer Free Writing Prospectus based upon and in conformity with written information furnished to the Company by any Underwriter specifically for use therein, it being understood and agreed that the only such information furnished by or on behalf of any Underwriter consists of the information described as such in the letter agreement between you and the Underwriters dated the date hereof.

(h) The Company is not the subject of a cease trade order, management cease trade order, de-listing or any other order preventing or suspending trading of any securities of the Company issued by the Commission, Canadian Regulators, the NYSE Amex or the Toronto Stock Exchange, or any of them, and the Company is, to the best of its knowledge, not aware of any such order being contemplated or threatened by the Commission, Canadian Regulators, the NYSE Amex or the Toronto Stock Exchange, or any of them.

(i) The Company is a reporting issuer, or the equivalent thereof, under the Canadian Securities Laws, is not in default of any requirement of the Canadian Securities Laws, and the Company is not included on a list of defaulting reporting issuers maintained by any of the Canadian Regulators that maintain such lists.

(j) All disclosure and filings on the public record and fees required to be made and paid by the Company and its subsidiaries pursuant to the Canadian Securities Laws have been made and paid, and the Company has not filed any confidential material change reports.

(k) Each of the Company and its subsidiaries has been duly incorporated or organized, as the case may be, and is validly existing in good standing under the laws of the jurisdiction of its incorporation or organization with full corporate power and authority to own or lease it assets, as the case may be, and to operate its properties and conduct its business as described in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement, and is duly qualified to do business as a foreign corporation and is in good standing under the laws of each jurisdiction which requires such qualification and in which the failure to qualify would have a Material Adverse Effect.

(l) All the outstanding shares of capital stock of each subsidiary of the Company have been duly and validly authorized and issued and are fully paid and non-assessable, and all outstanding shares of capital stock of the Company’s subsidiaries other than US Gold Canadian Acquisition Corporation are owned by the Company, either directly or through wholly owned subsidiaries, free and clear of any security interests, claims, liens or encumbrances. The outstanding shares of capital stock of each subsidiary of the Company were issued in compliance with all applicable securities laws and in accordance with the organizing documents of each entity, as applicable, and were not issued in violation of any preemptive rights, resale rights, rights of first refusal or similar rights.

(m) The Company’s authorized equity capitalization is as set forth in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement. The share capital of the Company conforms in all material respects to the description thereof contained in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement. The outstanding shares of Common Stock have been duly and validly authorized and issued and are fully paid and non-assessable and have been issued in compliance with all applicable securities laws and in accordance with the Company’s organizing documents. The Securities being sold hereunder by the Company have been duly and validly authorized, and, when issued and delivered to and paid for by the Underwriters pursuant to this Agreement, will be fully paid and non-assessable and will not be issued in violation of any preemptive rights, resale rights, rights of first refusal or similar rights. The holders of outstanding shares of capital stock of the Company are not entitled to preemptive rights, resale rights, rights of first refusal or similar rights to subscribe for the Securities, except as set forth in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement.

(n) Neither the Company nor any of its subsidiaries has sustained since the date of the latest audited financial statements included or incorporated by reference in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement any material loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor dispute or court or governmental action, order or decree, otherwise than as set forth or contemplated in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement; and, since the respective dates as of which information is given in the Registration Statement, the Canadian MJDS Base Prospectus, the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement, there has not been (i) any change in the capital stock or long-term debt of the Company or any of its subsidiaries (other than the conversion of exchangeable shares of US Gold Canadian Acquisition Corporation as may be effected from time to time, as set forth in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement), or (ii) any material adverse change, or any development involving a prospective material adverse change, in or affecting the general affairs, management, financial position, stockholders’ equity or results of operations of the Company and its subsidiaries, or (iii) any transactions entered into by the Company or any of its subsidiaries, other than in the ordinary course of business, which are material with respect to the Company and its subsidiaries, taken as a whole, or (iv) any dividend or distribution of any kind declared, paid or made by the Company on any class of its share capital, except in each case as set forth in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement.

(o) There is no franchise, contract or other document of a character required to be described in the Registration Statement, the Disclosure Package or the Final Prospectus, or to be filed as an exhibit thereto, that is not described or filed as required; and the statements in any Preliminary Prospectus, the Preliminary Canadian MJDS Supplement, the Final Prospectus and the Final Canadian MJDS Supplement under the headings “Risk Factors — Risks Related to Our Company — Our ongoing operations and past mining activities are subject to environmental risks, which could expose us to significant liability and delay, suspension or termination of our operations”, “— Legislation has been proposed that would significantly affect the mining industry” and “— Gain recognized by non-U.S. holders and non-U.S. persons holding any interest in the Company other than solely as a creditor (including, for example, convertible debt) on the sale or other disposition of our securities may be subject to U.S. federal income tax,” “Description of Common Stock” and “Material United States Federal Income Tax Considerations for Non-U.S. Holders” and in the Base Prospectus and the Canadian MJDS Base Prospectus under the headings “Description of Securities We May Offer,” and “Description of Capital Stock” insofar as such statements summarize legal matters, agreements, documents or proceedings discussed therein, are accurate and fair summaries of such legal matters, agreements, documents or proceedings.

(p) The Company is not and, after giving effect to the offering and sale of the Securities and the application of the proceeds thereof as described in the Disclosure Package and the Final Prospectus, will not be an “investment company” as defined in the Investment Company Act of 1940, as amended.

(q) No consent, approval, authorization, filing with or order of any court or governmental agency or body, or the approval of the Company’s shareholders, is required in connection with the transactions contemplated herein, except (1) such as have been obtained under the Act, (2) such as may be required by the Financial Industry Regulatory Authority, the NYSE Amex and the Toronto Stock Exchange, (3) such as may be required under the blue sky laws of any jurisdiction in connection with the purchase and distribution of the Securities by the Underwriters in the manner contemplated herein and in the Disclosure Package and the Final Prospectus, and (4) such as may be required with the Canadian Regulators in each of the Canadian Jurisdictions pursuant to Canadian Securities Laws.

(r) None of the issue and sale of the Securities, the execution and delivery by the Company of this Agreement and the consummation of any other of the transactions herein contemplated or the fulfillment of the terms hereof will conflict with, result in a breach or violation of, or result in the imposition of any lien, charge or encumbrance upon any property or assets of the Company or any of its subsidiaries pursuant to (1) the organizational documents of the Company or any of its subsidiaries, (2) the terms of any indenture, contract, lease, mortgage, deed of trust, note agreement, loan agreement or other agreement, obligation, condition, covenant or instrument to which the Company or any of its subsidiaries is a party or bound or to which its or their property is subject, (3) any statute, law, rule, or regulation, or (4) any judgment, writ, injunction, ruling, order or decree of any court, regulatory body, administrative agency, governmental body, arbitrator or other authority, domestic or foreign, having jurisdiction over the Company or any of its subsidiaries or any of its or their properties.

(s) The consolidated historical financial statements and notes thereto of the Company and its subsidiaries included or incorporated by reference in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus present fairly in all material respects the consolidated financial condition, results of operations and cash flows of the Company and its subsidiaries as of the dates, for the periods indicated and on the basis stated therein, comply as to form with the applicable accounting requirements of the Act and the Exchange Act and the MJDS Rule (as modified by the exemptive relief, received by or on behalf of the Canadian Regulators, from the Canadian generally accepted accounting principles (such generally accepted accounting principles of any jurisdiction begin referred to herein as “GAAP”) reconciliation requirement in NI 71-101) and have been prepared in all material respects in conformity with U.S. GAAP applied on a consistent basis throughout the periods involved (except as otherwise noted therein). The selected consolidated financial data set forth under the caption

“Selected Financial Data” in the Final Prospectus, the Final Canadian MJDS Supplement and the Disclosure Package fairly present, on the basis stated in the Final Prospectus, the Final Canadian MJDS Supplement and the Disclosure Package, the information included therein in all material respects and has been compiled in all material respects on a basis consistent with that of the Company’s unaudited and audited financial statements, as applicable. The other financial and statistical data contained or incorporated by reference in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus are accurately and fairly presented and prepared on a basis consistent with the financial statements and books and records of the Company; there are no financial statements (historical or pro forma) that are required to be included in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus that are not included or will not be included as required; and the Company and its subsidiaries do not have any material liabilities or obligations, direct or contingent (including any off-balance sheet obligations), not described in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus that would otherwise be required to be described therein; and all disclosures contained or incorporated by reference in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus regarding “non-GAAP financial measures” (as such term is defined by the rules and regulations of the Commission) comply with Regulation G of the Exchange Act and Item 10 of Regulation S-K promulgated under the Act and Exchange Act, to the extent applicable.

(t) No action, suit, investigation or proceeding by or before any court or governmental agency, authority or body, domestic or foreign, or any arbitrator involving the Company or any of its subsidiaries or its or their property is pending or, to the knowledge of the Company, threatened that could reasonably be expected to have a Material Adverse Effect, except as set forth in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement (in each case, exclusive of any supplements thereto). The aggregate of all pending legal or governmental proceedings to which the Company or any subsidiary is a party or of which any of their respective properties or assets is the subject that are not described in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus, including ordinary routine litigation incidental to the business, could not reasonably be expected to have a Material Adverse Effect.

(u) Each of the Company and each of its Significant Subsidiaries owns or leases all such properties as are necessary to the conduct of its operations as presently conducted; the Company and its Significant Subsidiaries have good and marketable title to all real property owned by them in fee simple, defensible title to all unpatented mining claims owned by them (subject, as applicable, to the paramount title of the U.S.), and good and marketable title to all personal property

owned by them, in each case free and clear of all liens, encumbrances and defects of any kind (including mining, zoning, use or building code restrictions that would prohibit or prevent the continued effective ownership, leasing, licensing or use of such property in the business of the Company and its Significant Subsidiaries); and any real property and buildings held under lease by the Company and its Significant Subsidiaries are held by them under valid, subsisting and enforceable leases with such exceptions as are not material and do not interfere with the use made and proposed to be made of such property and buildings by the Company and its Significant Subsidiaries. The Company and its Significant Subsidiaries hold either freehold title, mining leases, mining concessions, mining claims or participating interests or other conventional property or proprietary interests or rights, recognized in the jurisdiction in which a particular property is located, in respect of the ore bodies and minerals located in properties in which the Company and its Significant Subsidiaries have an interest as described in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus under valid, subsisting and enforceable title documents or other recognized and enforceable agreements or instruments, sufficient to permit the Company or applicable Significant Subsidiary to explore the minerals relating thereto. All property, leases or claims in which the Company or any Significant Subsidiary has an interest or right have been validly located and recorded in accordance with all applicable laws and are valid and subsisting where the failure to be so would have a Material Adverse Effect. The Company and its Significant Subsidiaries have all necessary surface rights, access rights and other necessary rights and interests relating to the properties in which the Company and its Significant Subsidiaries have an interest as described in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus granting the Company or applicable Significant Subsidiary the right and ability to explore for minerals, ore and metals for development purposes as are appropriate in view of the rights and interest therein of the Company or applicable Significant Subsidiary, with only such exceptions as do not interfere with the use made by the Company or applicable subsidiary of the rights or interest so held, and each of the proprietary interests or rights and each of the documents, agreements and instruments and obligations relating thereto referred to above is currently in good standing in the name of the Company or a subsidiary where the failure to be so would have a Material Adverse Effect. The Company is not aware of any reason that it is not or would not be entitled to extract minerals from its mines as set forth in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus and to do all of the exploration and development contemplated in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus.

(v) No relationship, direct or indirect, exists between or among the Company or any of its subsidiaries, on the one hand, and the directing officers, stockholders or affiliates of the Company or any of its subsidiaries, on the other hand, that are

required by the Act or applicable Canadian Securities Laws to be described in the Disclosure Package, the Base Prospectus, the Final Prospectus, the Registration Statement, the Canadian MJDS Base Prospectus or the Final Canadian MJDS Supplement that is not so described in such documents.

(w) Neither the Company nor any subsidiary of the Company is in violation or default of (1) any provision of its organizational documents, (2) the terms of any indenture, contract, lease, mortgage, deed of trust, note agreement, loan agreement or other agreement, obligation, condition, covenant or instrument to which it is a party or bound or to which its property is subject, or (3) any statute, law, rule, regulation, judgment, order or decree of any court, regulatory body, administrative agency, governmental body, arbitrator or other authority having jurisdiction over the Company or such subsidiary or any of its properties, as applicable, any of which defaults or violations described in clauses (2) through (3) will have, or after any required notice and passage of any applicable grace period, would have, a Material Adverse Effect.

(x) KPMG LLP (Toronto, Canada), KPMG LLP (Denver, U.S.) and Xxxxx Winter Xxxxxxxxx & Co, LLP, who have each audited certain financial statements of the Company and its consolidated subsidiaries and delivered their respective report with respect to the audited consolidated financial statements and schedules included or incorporated by reference in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement, are each an independent registered public accounting firm with respect to the Company within the meaning of the Act and the Exchange Act and the applicable published rules and regulations thereunder the MJDS Rule and the applicable published rules and regulations thereunder.

(y) The Company and each of its subsidiaries has filed all foreign, federal, state and local tax returns that are required to be filed or has requested extensions thereof (except in any case in which the failure so to file would not have a Material Adverse Effect), and has paid all taxes required to be paid by it and any other assessment, fine or penalty levied against it, to the extent that any of the foregoing is due and payable, except for any such assessment, fine or penalty that is currently being contested in good faith or as would not have a Material Adverse Effect.

(z) No labor problem or dispute with the employees of the Company or any of its Significant Subsidiaries exists or is threatened or imminent, and the Company is not aware of any existing or imminent labor disturbance by the employees of any of its or its Significant Subsidiaries’ principal suppliers, contractors or customers, that could have a Material Adverse Effect.

(aa) The Company and each of its Significant Subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as are prudent and customary in the businesses in which they are engaged, other than as described in the Registration Statement, the Base

Prospectus, any Preliminary Prospectus or the Final Prospectus; all policies of insurance and fidelity or surety bonds insuring the Company or any of its Significant Subsidiaries or their respective businesses, assets, employees, officers and directors are in full force and effect; the Company and its Significant Subsidiaries are in compliance with the terms of such policies and instruments in all material respects; there are no claims by the Company or any of its subsidiaries under any such policy or instrument as to which any insurance company is denying liability or defending under a reservation of rights clause; neither the Company nor any such Significant Subsidiary has been refused any insurance coverage sought or applied for; and neither the Company nor any such Significant Subsidiary has any reason to believe that it will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business at a cost that would not have a Material Adverse Effect.

(bb) No subsidiary of the Company is currently prohibited, directly or indirectly, from paying any dividends to the Company, from making any other distribution on such subsidiary’s capital stock, from repaying to the Company any loans or advances to such subsidiary from the Company or from transferring any of such subsidiary’s property or assets to the Company or any other subsidiary of the Company.

(cc) Except as set forth in the Disclosure Package, the Final Prospectus Supplement and the Final Canadian MJDS Supplement, the Company and its subsidiaries possess all licenses, concessions, certificates, permits and other authorizations issued by the appropriate federal, state or foreign regulatory authorities necessary to conduct their respective businesses (“Permits”); the Company and its subsidiaries have fulfilled and performed in all material respects all of their respective obligations with respect to such Permits, and neither the Company nor any such subsidiary has received any notice of proceedings relating to the revocation or modification of any such Permit which, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would have a Material Adverse Effect, except as set forth in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement (in each case, exclusive of any supplement thereto). All Permits are valid and in full force and effect, except where the invalidity of such Permits or failure of such Permits to be in full force and effect would not have a Material Adverse Effect.

(dd) The Company and each of its subsidiaries maintains and will maintain a system of internal accounting controls sufficient to provide reasonable assurance that (1) transactions are executed in accordance with management’s general or specific authorizations; (2) transactions are recorded as necessary to permit preparation of financial statements in conformity with U.S. GAAP and to maintain asset accountability; (3) access to assets is permitted only in accordance with management’s general or specific authorization; and (4) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences. The

Company and its subsidiaries’ internal controls over financial reporting are effective, and the Company and its subsidiaries are not aware of any material weakness or unremediated significant deficiencies in their internal controls over financial reporting. The Company maintains and will maintain disclosure controls and procedures (as defined as Rule 13a-15 and 15d-15(e) of the Exchange Act); such disclosure controls and procedures are effective to perform the function for which they were established.

(ee) The Company has not taken, directly or indirectly, any action designed to or that would constitute or that might reasonably be expected to cause or result in, under the Exchange Act or otherwise, stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Securities.

(ff) Except as set forth in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement, and except as would not reasonably be expected to result in a Material Adverse Effect, (1) the Company and its subsidiaries have been and are in compliance with any and all applicable foreign, federal, state and local laws and regulations relating to the protection of human health and safety (with respect to exposure to hazardous or toxic substances), the environment, hazardous or toxic substances or wastes, pollutants or contaminants (“Environmental Laws”); (2) the Company and its subsidiaries have received and have been and are in compliance with all permits, licenses or other approvals required of them under applicable Environmental Laws to conduct their respective businesses; (3) the Company and its subsidiaries have not received written notice of any actual or potential liability under any Environmental Law. Except as set forth in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement, and except as would not reasonably be expected to result in a Material Adverse Effect (exclusive of any supplement thereto); (4) neither the Company nor any of its subsidiaries has been named as a “potentially responsible party” under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended, or any similar state or foreign Environmental Laws, or is subject to any pending or threatened proceeding in which a governmental entity is a party. There are no events or circumstances that might reasonably be expected to form the basis of an order for cleanup or remediation, or an action, suit or proceeding by any private party or governmental body or agency, against or affecting the Company or any of its subsidiaries relating to any Environmental Laws, except as would not reasonably be expected to result in a Material Adverse Effect.

(gg) In the ordinary course of its business, the Company periodically reviews the effect of Environmental Laws on the business, operations and properties of the Company and its subsidiaries, in the course of which it identifies and evaluates associated costs and liabilities of the Company and its subsidiaries. On the basis of such review, the Company has reasonably concluded that such associated costs and liabilities would not, singly or in the aggregate, have a Material Adverse Effect, except as set forth in the Disclosure Package, Final Prospectus and the

Final Canadian MJDS Supplement (in each case, exclusive of any supplement thereto).

(hh) Neither the Company nor any of its subsidiaries has or maintains a “pension plan” (as defined in Section 3(2) of ERISA).

(ii) There is and has been no failure on the part of the Company and any of the Company’s directors or officers, in their capacities as such, to comply in all material respects with any provision of the U.S. Sarbanes Oxley Act of 2002 and the rules and regulations promulgated in connection therewith (the “Sarbanes Oxley Act”), including Section 402 related to loans and Sections 302 and 906 related to certifications.

(jj) Neither the Company nor any of its Significant Subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee or affiliate of the Company or any of its Significant Subsidiaries is aware of or has taken any action, directly or indirectly, that would result in a violation by such persons of the U.S. Foreign Corrupt Practices Act of 1977, as amended, and the rules and regulations thereunder (the “FCPA”), including, without limitation, making use of the mails or any means or instrumentality of interstate commerce corruptly in furtherance of an offer, payment, promise to pay or authorization of the payment of any money, or other property, gift, promise to give, or authorization of the giving of anything of value to any “foreign official” (as such term is defined in the FCPA) or any foreign political party or official thereof or any candidate for foreign political office, in contravention of the FCPA, and the Company and its Significant Subsidiaries have conducted their businesses in compliance with the FCPA.

(kk) The operations of the Company and its Significant Subsidiaries are and have been conducted at all times in compliance in all material respects with applicable financial recordkeeping and reporting requirements of the U.S. Currency and Foreign Transactions Reporting Act of 1970, as amended, the money laundering statutes of all jurisdictions, the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency, domestic or foreign, (collectively, the “Money Laundering Laws”), and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its Significant Subsidiaries with respect to the Money Laundering Laws is pending or, to the knowledge of the Company, threatened.

(ll) Neither the Company nor any of its Significant Subsidiaries nor, to the knowledge of the Company, any director, officer, agent or employee of the Company or any of its Significant Subsidiaries is currently (1) a person or entity designated by the U.S. Government as a Specially Designated National and Blocked Person (“SDN”) on the most current list published by the U.S. Treasury Department’s Office of Foreign Assets Control (“OFAC”) at its official website, xxxx://xxx.xxxxx.xxx/xxxxxxx/xxxxxxxxxxx/xxxx, with which a person or entity subject to U.S. jurisdiction cannot deal or otherwise engage in business

transactions or (2) owned or controlled by (including without limitation by virtue of such person being a director or owning voting shares or interests) or acting for or on behalf of any person or entity identified in clause (1) above; and the Company will not use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner for the purpose of financing the activities of any person currently subject to any U.S. sanctions administered by OFAC.

(mm) The Company and its subsidiaries own, possess, license or have other rights to use, on reasonable terms, all patents, patent applications, trade and service marks, trade and service xxxx registrations, trade names, copyrights, licenses, inventions, trade secrets, technology, know-how and other intellectual property (collectively, the “Intellectual Property”) necessary for the conduct of the Company’s business as now conducted or as proposed in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement to be conducted, except as where the failure to do so would reasonably be expected to have a Material Adverse Effect. (1) There are no rights of third parties to any such Intellectual Property that is owned exclusively by the Company or any of its subsidiaries except such rights as may have been granted in the ordinary course of business; (2) to the Company’s knowledge, there is no material infringement by third parties of any such Intellectual Property; (3) there is no pending or, to the Company’s knowledge, threatened action, suit, proceeding or claim by others challenging the Company’s rights in or to any such Intellectual Property, and the Company is unaware of any facts which would form a reasonable basis for any such claim; (4) there is no pending or, to the Company’s knowledge, threatened action, suit, proceeding or claim by others challenging the validity or scope of any such Intellectual Property, and the Company is unaware of any facts which would form a reasonable basis for any such claim; (5) there is no pending or, to the Company’s knowledge, threatened action, suit, proceeding or claim by others that the Company infringes or otherwise violates any patent, trademark, copyright, trade secret or other proprietary rights of others, and the Company is unaware of any other fact which would form a reasonable basis for any such claim that would reasonably be expected to have a Material Adverse Effect; and(6) to the Company’s knowledge, there is no U.S. or foreign patent or published U.S. patent application which contains claims that dominate or may dominate any Intellectual Property described in the Disclosure Package, the Final Prospectus or the Final Canadian MJDS Supplement as being owned by or licensed to the Company or that interferes with the issued or pending claims of any such Intellectual Property. Neither the Company nor any of its subsidiaries holds any U.S. or Canadian patents.

(nn) Except as disclosed in the Registration Statement, the Canadian MJDS Base Prospectus, the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement, the Company (1) does not have any material lending or other relationship with any bank or lending affiliate of any Underwriter and (2) does not intend to use any of the proceeds from the sale of the Securities hereunder to repay any outstanding debt owed to any affiliate of any Underwriter.

(oo) The offering is of a class of securities for which a bona fide independent market exists as of the date of the filing of the Registration Statement and as of the Effective Date.

(pp) With respect to information set forth in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus: (i) information relating to the Company’s estimates of mineral reserves and resources as at the date they were prepared has been reviewed and verified by the Company or independent consultants to the Company as being consistent with the Company’s mineral reserve and mineral resource estimates as at the date they were prepared; (ii) the mineral reserve and mineral resource estimated have been prepared in accordance with Industry Guide 7 under the Act and/or National Instrument 43-101 — Standards of Disclosure for Mineral Projects, as applicable, by or under the supervision of a qualified person as defined therein; and (iii) the methods used in estimating the Company’s mineral reserves and mineral resources are in accordance with accepted mineral reserve and mineral resource estimation practices.

(qq) The Company has full right, power and authority to execute and deliver this Agreement and to perform its obligations hereunder; and all corporate action required to be taken for the due and proper authorization, execution and delivery by it of this Agreement and the Preliminary Canadian MJDS Base Prospectus, the Canadian MJDS Base Prospectus, the Preliminary Canadian MJDS Supplement and the Final Canadian MJDS Supplement and the consummation by it of the transactions contemplated hereby and thereby has been duly and validly taken. This Agreement and each of the Preliminary Canadian MJDS Base Prospectus, the Canadian MJDS Base Prospectus, the Preliminary Canadian MJDS Supplement and the Final Canadian MJDS Supplement has been duly authorized, executed and delivered by the Company and the Agreement constitutes a valid and binding obligation of the Company enforceable against the Company in accordance with its terms, except as enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium and other laws relating to or affecting the rights of creditors generally and except as limited by the application of equitable principles when equitable remedies are sought, and by the fact that rights to indemnity, contribution and waiver, and the ability to sever unenforceable terms, may be limited by applicable law.

(rr) Except as disclosed in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus as at the date thereof, and except for (1) options to acquire 2,698,167 shares of Common Stock; (2) options to acquire 585,293 exchangeable shares of Canadian Exchange Co.; and (3) warrants to purchase 8,851,000 additional shares of Common Stock outstanding as of the date hereof, no person has any right, agreement, option, warrant or other rights to purchase, present or future, contingent or absolute, or any right capable of becoming a right, agreement or option, warrant or other rights to purchase, for the issue or allotment

of any shares of the Company or any other agreement, option, warrant or other rights to purchase, for the issue or allotment of any shares of the Company or any other security convertible into or exchangeable for any such shares or to require the Company to purchase, redeem or otherwise acquire any of the issued and outstanding shares of the Company, as the case may be.

(ss) All statistical, market-related or forward-looking data included or incorporated by reference in the Disclosure Package, the Final Prospectus, the Registration Statement, the Final Canadian MJDS Supplement and the Canadian MJDS Base Prospectus are based on or derived from sources that the Company reasonably believes to be reliable and accurate in all material respects and represent its good faith estimate that is made on the basis of data derived from such sources, and the Company has obtained the written consent to the use of such data from such sources to the extent required.

(tt) The Common Stock, including the Securities, are duly listed, and admitted and authorized for trading, on the NYSE Amex and the Toronto Stock Exchange, subject, in the case of the Securities, (i) with respect to the NYSE Amex, to receipt of an approval letter and (ii) with respect to the Toronto Stock Exchange, to the satisfaction of customary conditions required by such exchange.

(uu) Except pursuant to this Agreement and as set forth in the Registration Statement, neither the Company nor any of its subsidiaries has incurred any liability for any finder’s or broker’s fee or agent’s commission in connection with the execution and delivery of this Agreement or the consummation of the transactions contemplated hereby or by the Registration Statement.

(vv) Computershare Shareholder Services, Inc., at its office in the City of Lakewood, Colorado, has been duly appointed as registrar and transfer agent for the Common Stock of the Company.

(ww) There are no reports or information that in accordance with the Canadian Securities Laws must be made publicly available or filed in connection with the offering of the Common Stock that have not been made publicly available as required.

Any certificate signed by any officer of the Company and delivered to the Underwriters or counsel for the Underwriters in connection with the offering of the Securities shall be deemed to be a representation and warranty by the Company, as to matters covered thereby, to each Underwriter.

2. Purchase and Sale.

(a) Subject to the terms and conditions and in reliance upon the representations and warranties herein set forth, the Company agrees to sell to each Underwriter, and each Underwriter agrees, severally and not jointly, to purchase from the Company, at the purchase price of US$1.88 per share, the amount of the Underwritten

Securities set forth opposite such Underwriter’s name in Schedule I to this Agreement.

(b) Subject to the terms and conditions and in reliance upon the representations and warranties herein set forth, the Company hereby grants an option to the Underwriters to purchase, severally and not jointly, up to three million three hundred thousand (3,300,000) Option Securities at the same purchase price per share as the Underwriters shall pay for the Underwritten Securities. Such option may be exercised in whole or in part (but in no event shall there be more than two settlement dates unless otherwise agreed to by the parties) to cover over-allotments at any time on or before the 30th day after the date of this Agreement upon written or telegraphic notice by the Underwriters to the Company setting forth the number of shares of the Option Securities as to which the Underwriters are exercising the option and the settlement date. The number of Option Securities to be purchased by each Underwriter shall be the same percentage of the total number of shares of the Option Securities to be purchased by the several Underwriters as such Underwriter is purchasing of the Underwritten Securities, subject to such adjustments as you in your absolute discretion shall make to eliminate any fractional shares.

3. Delivery and Payment. Delivery of and payment for the Underwritten Securities and the Option Securities (if the option provided for in Section 2(b) hereof shall have been exercised on or before the third Business Day prior to the Closing Date) shall be made at 10:00 AM, New York City time, on May 19, 2009, or at such time on such later date not more than three Business Days after the foregoing date as the Underwriters shall designate, which date and time may be postponed by agreement between the Underwriters and the Company or as provided in Section 9 hereof (such date and time of delivery and payment for the Securities being herein called the “Closing Date”). Delivery of the Securities shall be made to the Underwriters for the respective accounts of each Underwriter against payment by each Underwriter of the respective aggregate purchase prices of the Securities being sold by the Company to or upon the order of the Company by wire transfer payable in same-day funds to the account specified by the Company. Delivery of the Underwritten Securities and the Option Securities shall be made through the facilities of The Depository Trust Company unless the Underwriters shall otherwise instruct.

If the option provided for in Section 2(b) hereof is exercised after the third Business Day prior to the Closing Date, the Company will deliver the Option Securities (at the expense of the Company) to the Underwriters, at 000 Xxxx Xxxxxx Xxxx, Xxxxx 000, Xxxxxxx, Xxxxxxx, Xxxxxx M5H 1J8, on the date specified by the Underwriters (which shall be within three Business Days after exercise of such option) for the respective accounts of the Underwriters, against payment by each Underwriter of the purchase price thereof to or upon the order of the Company by wire transfer payable in same-day funds to the account specified by the Company. If settlement for the Option Securities occurs after the Closing Date, the Company will deliver to the Underwriters on the settlement date for the Option Securities, and the obligation of the Underwriters to purchase the Option Securities shall be conditioned upon receipt of, supplemental opinions, certificates and

letters confirming as of such date the opinions, certificates and letters delivered on the Closing Date pursuant to Section 6 hereof.

4. Offering by Underwriters. It is understood that the Underwriters propose to offer the Securities for sale to the public as set forth in the Disclosure Package, Final Prospectus and the Final Canadian MJDS Supplement and any such offer shall be in accordance with the selling restrictions set forth in Exhibit A hereto.

5. Agreements.

The Company agrees with the Underwriters that:

(a) Prior to the termination of the offering of the Securities, the Company will not file any amendment to the Registration Statement or supplement (including the Final Prospectus or any Preliminary Prospectus) to the Base Prospectus or supplement to the Canadian MJDS Base Prospectus (including the Final Canadian MJDS Supplement or any Preliminary Canadian MJDS Supplement) unless the Company has furnished you a copy for your review prior to filing and will not file any such proposed amendment or supplement to which you reasonably object, unless otherwise required by the Act, the Exchange Act or the MJDS Rule. Subject to the foregoing sentence, the Company will cause the Final Prospectus and the Final Canadian MJDS Supplement, properly completed, and any supplement thereto to be filed in a form approved by the Underwriters with the Commission or the Canadian Regulators, as the case may be, pursuant to the applicable paragraph of Rule 424(b) or the MJDS Rule within the time period prescribed and will provide evidence satisfactory to the Underwriters of such timely filing. The Company will promptly advise the Underwriters (1) when the Final Prospectus and the Final Canadian MJDS Supplement, and any supplement thereto, shall have been filed (if required) with the Commission pursuant to Rule 424(b), or the Canadian Regulators pursuant to the MJDS Rule, as the case may be, (2) when, prior to termination of the offering of the Securities, any amendment to the Registration Statement shall have been filed or become effective, (3) of any request by the Commission or its staff for any amendment of the Registration Statement, or for any supplement to the Final Prospectus or for any additional information, (4) any request by the Canadian Regulators for any amendment to the Final Canadian MJDS Supplement or for any additional information, (5) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or of any notice objecting to its use or the institution or threatening of any proceeding for that purpose, and (6) of the receipt by the Company of any notification with respect to the suspension of the qualification of the Securities for sale in any jurisdiction or the institution or threatening of any proceeding for such purpose. The Company will use its best efforts to prevent the issuance of any such stop order or the occurrence of any such suspension or objection to the use of the Registration Statement and, upon such issuance, occurrence or notice of objection, to obtain as soon as possible the withdrawal of such stop order or relief from such occurrence or objection, including, if necessary, by filing an amendment to the Registration Statement or a new

registration statement and using its best efforts to have such amendment or new registration statement declared effective as soon as practicable.

(b) If, at any time prior to the filing of the Final Prospectus pursuant to Rule 424(b) or the filing of the Final Canadian MJDS Supplement pursuant to the MJDS Rule, any event occurs as a result of which the Disclosure Package, as of the Applicable Time, would include any untrue statement of a material fact or omit to state any material fact necessary to make the statements therein in the light of the circumstances under which they were made or the circumstances then prevailing not misleading, the Company will (1) notify promptly the Underwriters so that any use of the Disclosure Package may cease until it is amended or supplemented, (2) subject to the first sentence of paragraph (a) of this Section 5, amend or supplement the Disclosure Package to correct such statement or omission, and (3) supply any amendment or supplement to you in such quantities as you may reasonably request.

(c) If, at any time when a prospectus relating to the Securities is required to be delivered under the Act (including in circumstances where such requirement may be satisfied pursuant to Rule 172) or the Canadian Securities Laws, any event occurs as a result of which the Final Prospectus as then supplemented or the Final Canadian MJDS Supplement as then supplemented would include any untrue statement of a material fact or omit to state any material fact necessary to make the statements therein in the light of the circumstances under which they were made at such time not misleading, or if it shall be necessary to amend the Registration Statement or the Canadian MJDS Base Prospectus, file a new registration statement, a new Canadian MJDS base prospectus or supplement the Final Prospectus or the Final Canadian MJDS Supplement to comply with the Act or the Exchange Act or the respective rules thereunder or Canadian Securities Laws, as the case may be, including in connection with the use or delivery of the Final Prospectus and the Final Canadian MJDS Supplement, the Company promptly will (i) notify the Underwriters of any such event, (ii) prepare and file with the Commission or the Canadian Regulators, as applicable, subject to the first sentence of paragraph (a) of this Section 5, an amendment or supplement, new registration statement, or new Canadian MJDS Base Prospectus which will correct such statement or omission or effect such compliance, (iii) use its best efforts to have any amendment to the Registration Statement or new registration statement declared effective, or amendment to the Canadian MJDS Base Prospectus or new Canadian MJDS base prospectus receipted, as applicable as soon as practicable in order to avoid any disruption in use of the Final Prospectus and the Final Canadian MJDS Supplement and (iv) supply any supplemented Final Prospectus and any supplemented Final Canadian MJDS Supplement to you in such quantities as you may reasonably request.

(d) No later than the due date for the Company’s next quarterly report on Form 10-Q under the Exchange Act (as such date may be extended pursuant to and in compliance with Rule 12b-25 of the Exchange Act), the Company will make generally available to its security holders and to the Underwriters an earnings

statement or statements of the Company and its subsidiaries which will satisfy the provisions of Section 11(a) of the Act and Rule 158.

(e) The Company will use the net proceeds received by it from the sale of the Securities pursuant to this Agreement in the manner specified in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement under the caption “Use of Proceeds.”

(f) The Company will use its best efforts to list the Securities on the NYSE Amex and the Toronto Stock Exchange, maintain the listing of the Common Stock, including the Securities listed on the NYSE Amex, the Toronto Stock Exchange, and maintain its status as a “reporting issuer” under the applicable securities laws of the Canadian Jurisdictions and Quebec.

(g) Concurrently with the filing of the Final Prospectus with the Commission as described in Section 1(a) above, the Company will fulfill all requirements of applicable Canadian Securities Laws to enable to the Securities to be offered for sale and sold to the public in the Canadian Jurisdictions and will file with the Canadian Regulators the Final Canadian MJDS Supplement relating to the Securities and substantially in the form of the Final Prospectus with whatever additional items are required pursuant to the MJDS Rule.

(h) The Company will furnish to the Underwriters and counsel for the Underwriters signed copies of the Registration Statement (including exhibits thereto) and to each other Underwriter a copy of the Registration Statement (without exhibits thereto) and signed copies of the Canadian MJDS Base Prospectus and, so long as delivery of a prospectus by an Underwriter or dealer may be required by the Act (including in such circumstances where such requirement may be satisfied pursuant to Rule 172) or Canadian Securities Laws, as many copies of each Preliminary Prospectus, the Preliminary Canadian MJDS Supplement, the Final Prospectus, the Final Canadian MJDS Supplement, each Issuer Free Writing Prospectus and any supplement thereto as the Underwriters may reasonably request.

(i) The Company will arrange, if necessary, for the qualification of the Securities for sale under the laws of such jurisdictions as the Underwriters may designate and will maintain such qualifications in effect so long as required for the distribution of the Securities; provided that in no event shall the Company be obligated to qualify to do business in any jurisdiction where it is not now so qualified or to take any action that would subject it to service of process in suits, other than those arising out of the offering or sale of the Securities, in any jurisdiction where it is not now so subject.

(j) The Company will not without the prior written consent of the Underwriters, issue, offer, sell, contract to sell, pledge, or otherwise dispose of (or enter into any transaction which is designed to, or might reasonably be expected to, result in the disposition (whether by actual disposition or effective economic disposition due

to cash settlement or otherwise) by the Company or any affiliate of the Company, directly or indirectly, including the filing (or participation in the filing) of a registration statement or prospectus with the Commission or any Canadian Regulator or the Autorite des marches financiers in Quebec in respect of, or establish or increase a put equivalent position or liquidate or decrease a call equivalent position within the meaning of Section 16 of the Exchange Act, with respect to any other shares of Common Stock or any securities convertible into, or exercisable or exchangeable for, such Common Stock, or publicly announce an intention to effect any such transaction, for a period of 90 days after the date of this Agreement, except that the Company may (i) file a registration statement or prospectus with the Commission or the Canadian Regulators in respect of the Securities and sell the Securities to the Underwriters pursuant to this Agreement, (ii) issue and sell Common Stock or grant performance shares, stock appreciation rights, options or other equity-based awards pursuant to any employee stock option plan, stock ownership plan or dividend reinvestment plan of the Company in effect at the Execution Time, (iii) issue Common Stock issuable upon the conversion of securities or the exercise of warrants or options outstanding at the Execution Time.

(k) The Company has, and will, comply with all applicable securities (including Canadian Securities Laws) and other applicable laws, rules and regulations, including, without limitation, the Sarbanes Oxley Act, and will use its best efforts to cause the Company’s directors and officers, in their capacities as such, to comply with such laws, rules and regulations, including, without limitation, the provisions of the Sarbanes Oxley Act.

(l) The Company will not take, and will cause its subsidiaries not to take, directly or indirectly, any action designed to or that would constitute or that might reasonably be expected to cause or result in, under the Exchange Act or otherwise, stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Securities.

(m) The Company will pay at the time of closing on the Closing Date all reasonable costs and expenses incident to the performance of its obligations under this Agreement, including (i) the preparation, printing and filing with the Commission or the Canadian Regulators, as the case may be, of (a) the Registration Statement (including financial statements and exhibits), each Preliminary Prospectus, the Final Prospectus and each Issuer Free Writing Prospectus, and each amendment and supplement to any of the foregoing, and (b) each Preliminary Canadian MJDS Base Prospectus, Canadian MJDS Base Prospectus, the Preliminary Canadian MJDS Supplement, the Final Canadian MJDS Supplement and each amendment and supplement to any of the foregoing, (ii) the preparation, printing and delivery to the Underwriters of this Agreement, any Agreement among Underwriters and such other documents as may be required in connection with the offering, purchase, sale, issuance or delivery of the Securities, (iii) the preparation, issuance and delivery of the certificates, as applicable, for any transfer taxes and any stamp or other duties payable upon the sale, issuance or delivery of the

Securities to the Underwriters, (iv) the fees and disbursements of the Company’s legal counsel, accountants and other advisors, (v) the qualification of the Securities under applicable securities laws, and the NYSE Amex and the Toronto Stock Exchange, including filing fees and, subject to Section 7 herein, the reasonable fees and disbursements of legal counsel for the Underwriters in connection therewith and in connection with the preparation of any Blue Sky Survey and any supplement thereto, (vi) the printing and delivery to the Underwriters of copies of each Preliminary Prospectus, the Final Prospectus, each Issuer Free Writing Prospectus, each Preliminary Canadian MJDS Base Prospectus, the Canadian MJDS Base Prospectus, the Preliminary Canadian MJDS Supplement, the Final Canadian MJDS Supplement and all amendments or supplements to any of them and any costs associated with electronic delivery of any of the foregoing by the Underwriters to investors, (vii) the preparation, printing and delivery to the Underwriters of copies of the Blue Sky Survey and any supplement thereto, (viii) the fees and expenses of any transfer agent or registrar for the Securities, and (ix) the costs and expenses of the Company relating to investor presentations on any “road show” undertaken in connection with the marketing of the Securities, including without limitation, expenses associated with the production of road show slides and graphics, fees and expenses of any consultants engaged in connection with the road show presentations, travel and lodging expenses of the representatives and officers of the Company and any such consultants. Notwithstanding anything contained in this Agreement to the contrary, the Underwriters agree that they shall not be entitled to any underwriting discount or commission with respect to any Underwritten Securities purchased by Xxxxxx X. XxXxxx.

(n) The Company agrees that, unless it has or shall have obtained the prior written consent of each Underwriter, and each Underwriter, severally and not jointly, agrees with the Company that, unless it has or shall have obtained the prior written consent of the Company, it has not made and will not make an offer relating to the Securities that would constitute an Issuer Free Writing Prospectus or that would otherwise constitute a “free writing prospectus” (as defined in Rule 405) required to be filed by the Company with the Commission or retained by the Company under Rule 433; provided that the prior written consent of the parties hereto shall be deemed to have been given in respect of the free writing prospectuses included in Schedule II hereto. Any such free writing prospectus consented to by the Underwriters or the Company is hereinafter referred to as a “Permitted Free Writing Prospectus.” The Company agrees that (1) it has treated and will treat, as the case may be, each Permitted Free Writing Prospectus as an Issuer Free Writing Prospectus and (2) it has complied and will comply, as the case may be, with the requirements of Rules 164 and 433 applicable to any Permitted Free Writing Prospectus, including in respect of timely filing with the Commission, legending and record keeping.

6. Conditions to the Obligations of the Underwriters. The obligations of the Underwriters to purchase the Underwritten Securities and the Option Securities, as the case may be, shall be subject to the accuracy of the representations and warranties on the part of the

Company contained herein as of the Execution Time, the Closing Date and any settlement date pursuant to Section 3 hereof, to the accuracy of the statements of the Company made in any certificates pursuant to the provisions hereof, to the performance by the Company of its obligations hereunder and to the following additional conditions:

(a) The Final Prospectus and the Final Canadian MJDS Supplement and any supplement thereto have been filed with the Commission or the Canadian Regulators, as the case may be, in the manner and within the time period required by Rule 424(b) or the MJDS Rule, as the case may be; any other material required to be filed by the Company pursuant to Rule 433(d) shall have been filed with the Commission within the applicable time periods prescribed for such filings by Rule 433; any materials required to be filed by the Company pursuant to the MJDS Rule shall have been filed by the Company with the Canadian Regulators within the applicable time periods; and no stop order, or equivalent, suspending the effectiveness of the Registration Statement or the Canadian MJDS Base Prospectus or any notice objecting to its use shall have been issued and no proceedings for that purpose shall have been instituted or threatened.

(b) The Underwriters shall have reviewed confirmation from each of Xxxxx & Xxxxxxx L.L.P., Xxxxxxx & Xxxxx, P.C. and Fraser Xxxxxx Casgrain LLP that there are no claims to which its representation has been sought and that are outstanding in respect of the Company.

(c) The Company shall have requested and caused each of Xxxxx & Xxxxxxx L.L.P. and Xxxxxxx & Xxxxx, P.C., each U.S. counsel for the Company, and Fraser Xxxxxx Casgrain LLP, Canadian counsel for the Company, to have furnished to the Underwriters their opinions substantially in the forms set forth in Exhibits B-1 (U.S. Counsel opinion) and B-2 (Canadian counsel opinion) hereto, respectively, dated the Closing Date and any settlement date and addressed to the Underwriters. In the case of the opinion to be provided by Fraser Xxxxxx Casgrain LLP, they may rely on the opinions of local counsel acceptable to the Underwriters, acting reasonably, as to the qualification of the Securities for sale to the public and as to other matters governed by the laws of jurisdictions in Canada other than the provinces in which they are qualified to practice.

(d) The Company shall have caused the Underwriters to receive favorable title opinions dated the Closing Date regarding the Tonkin property, the Limosine Butte property, the New Pass property, the Gold Bar property, including the Gold Pick/Ridge, Hunter and Cabin Creek locations, the Magistral property, the El Xxxxx Project and the Palmarito Project, each in form and substance reasonably satisfactory to the Underwriters and counsel for the Underwriters.

(e) The Company shall have furnished to the Underwriters a certificate of the Company, signed by the Chief Executive Officer and the Chief Financial Officer of the Company or any other officers of the Company acceptable to the Underwriters in their discretion, dated the Closing Date and any settlement date, to the effect that the signers of such certificate have carefully examined the

Registration Statement, the Disclosure Package, the Final Prospectus, the Canadian MJDS Base Prospectus and the Final Canadian MJDS Supplement and any supplements or amendments thereto and this Agreement and that:

(i) the representations and warranties of the Company in this Agreement are true and correct on and as of the Closing Date and any settlement date with the same effect as if made on the Closing Date and any settlement date and the Company has complied with all the agreements and satisfied all the conditions on its part to be performed or satisfied at or prior to the Closing Date and any settlement date;

(ii) no stop order or equivalent suspending the effectiveness of the Registration Statement or the Canadian MJDS Base Prospectus or any notice objecting to its use has been issued and no proceedings for that purpose have been instituted or, to the Company’s knowledge, threatened;

(iii) since the date of the most recent financial statements included or incorporated by reference in the Disclosure Package, the Final Prospectus and the Final Canadian MJDS Supplement (exclusive of any supplement thereto), there has been no Material Adverse Effect; and

(iv) the Company has complied with the terms and conditions of this Agreement on its part to be complied with up to the time of closing on the Closing Date.

(f) The Underwriters shall have received on and as of the Closing Date and any settlement date, as the case may be, satisfactory evidence of the good standing of the Company and its subsidiaries in its jurisdiction of organization in writing from the appropriate governmental authority of such jurisdiction.

(g) The Company shall have requested and caused KPMG, LLP (Toronto, Canada) to have furnished to the Underwriters, at the Execution Time and at the Closing Date and any settlement date, letters (which may refer to letters previously delivered to the Underwriters), dated respectively as of the Execution Time and as of the Closing Date and any settlement date, in form and substance satisfactory to the Underwriters, confirming that it is an independent registered public accounting firm within the meaning of the Act and the Exchange Act and covering, without limitation, the Company’s audited financial statements for the year ended December 31, 2008 and the various financial disclosures related thereto contained in the Registration Statement, the Preliminary Prospectus, the Final Prospectus and the Issuer Free Writing Prospectuses, if any.

(h) The Company shall have requested and caused KPMG, LLP (Denver, U.S.) to have furnished to the Underwriters, at the Execution Time and at the Closing Date and any settlement date, letters (which may refer to letters previously delivered to the Underwriters), dated respectively as of the Execution Time and as of the Closing Date and any settlement date, in form and substance satisfactory to the

Underwriters, confirming that it is an independent registered public accounting firm within the meaning of the Act and the Exchange Act and covering, without limitation, the Company’s audited financial statements for the year ended December 31, 2007 and the various financial disclosures related thereto contained in the Registration Statement, the Preliminary Prospectus, the Final Prospectus and the Issuer Free Writing Prospectuses, if any.

(i) The Company shall have requested and caused Xxxxx Winter Xxxxxxxxx & Co, LLP to have furnished to the Underwriters, at the Execution Time and at the Closing Date and any settlement date, letters (which may refer to letters previously delivered to the Underwriters), dated respectively as of the Execution Time and as of the Closing Date and any settlement date, in form and substance satisfactory to the Underwriters, confirming that it is an independent registered public accounting firm within the meaning of the Act and the Exchange Act and covering, without limitation, the Company’s audited financial statements for the year ended December 31, 2006 and the various financial disclosures related thereto contained in the Registration Statement, the Preliminary Prospectus, the Final Prospectus and the Issuer Free Writing Prospectuses, if any.

(j) Subsequent to the Execution Time or, if earlier, the dates as of which information is given in the Registration Statement and Canadian MJDS Base Prospectus (exclusive of any amendment thereof) and the Final Prospectus and Final Canadian MJDS Supplement (exclusive of any amendment or supplement thereto), there shall not have been (A) any change or decrease specified in the letters referred to in paragraphs (g), (h) and (i) of this Section 6 or (B) any Material Adverse Effect, the effect of which, in any case referred to in clause (A) or (B) above, is, in the sole judgment of the Underwriters, so material and adverse as to make it impractical or inadvisable to proceed with the offering or delivery of the Securities as contemplated by the Registration Statement (exclusive of any amendment thereof), the Disclosure Package and the Final Prospectus (exclusive of any amendment or supplement thereto).

(k) Prior to the Closing Date and any settlement date, the Company shall have furnished to the Underwriters such further information, certificates and documents as the Underwriters may reasonably request.

(l) The Securities shall have been approved for listing on the NYSE Amex and, prior to the Closing Date, the Securities shall have been conditionally approved for listing, subject to the satisfaction of the customary conditions, on the Toronto Stock Exchange, subject only to official notice of issuance, and satisfactory evidence of such actions shall have been provided to the Underwriters.

(m) At the Execution Time, the Company shall have furnished to the Underwriters a letter substantially in the form of Exhibit C to this Agreement from each officer and director of the Company.

If any of the conditions specified in this Section 6 shall not have been fulfilled when and

as provided in this Agreement, or if any of the opinions and certificates mentioned above or elsewhere in this Agreement shall not be reasonably satisfactory in form and substance to the Underwriters and counsel for the Underwriters, this Agreement and all obligations of the Underwriters hereunder may be canceled at, or at any time prior to, the Closing Date by the Underwriters. Notice of such cancellation shall be given to the Company in writing or by telephone or facsimile confirmed in writing.

The documents required to be delivered by this Section 6 shall be delivered at the office of Xxxxxxxx Xxxxxxx LLP, counsel for the Underwriters, at 000 Xxxxxxxxx Xxxxxx, Xxx Xxxx, Xxx Xxxx 00000, on the Closing Date.

7. Reimbursement of Underwriters’ Expenses. Whether or not the transactions contemplated herein shall be completed, the Company shall reimburse the Underwriters on demand for all documented out-of-pocket costs and expenses (including reasonable fees and disbursements of U.S. and Canadian legal counsel in an amount not to exceed $250,000) that shall have been incurred by them in connection with the proposed purchase and sale of the Securities.

8. Indemnification and Contribution.

(a) The Company agrees to indemnify and hold harmless each Underwriter, the directors, officers, employees and agents of each Underwriter and each person who controls any Underwriter within the meaning of either the Act or the Exchange Act against any and all losses, claims, damages or liabilities, joint or several, to which they or any of them may become subject under the Act, the Exchange Act, the applicable Canadian Securities Laws or other federal, state or provincial statutory law or regulation, at common law or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon (1) any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, or Base Prospectus, any Preliminary Prospectus or any other preliminary prospectus supplement relating to the Securities, the Final Prospectus or any Issuer Free Writing Prospectus, the Preliminary Canadian MJDS Base Prospectus, the Canadian MJDS Base Prospectus, the Preliminary Canadian MJDS Supplement and the Final Canadian MJDS Supplement, or in any amendment thereof or supplement thereto, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, and (2) any misrepresentation (as defined by Canadian Securities Laws) contained in the Preliminary Canadian MJDS Base Prospectus, the Canadian MJDS Base Prospectus, the Preliminary Canadian MJDS Supplement and the Final Canadian MJDS Supplement, or in any amendment thereof or supplement thereto, and agrees to reimburse each such indemnified party, as incurred, for any legal or other expenses reasonably incurred by them in connection with investigating or defending any such loss, claim, damage, liability or action; provided, however, that the Company will not be liable in any such case to the extent that any such loss, claim, damage or liability arises out of or is based upon any such untrue statement or alleged untrue statement or omission or alleged

omission made therein in reliance upon and in conformity with written information furnished to the Company by or on behalf of any Underwriter through the Underwriters specifically for inclusion therein. This indemnity agreement will be in addition to any liability that the Company may otherwise have.

(b) Each Underwriter severally and not jointly agrees to indemnify and hold harmless the Company, each of its directors, each of its officers who signs the Registration Statement, and each person who controls the Company within the meaning of either the Act or the Exchange Act to the same extent as the foregoing indemnity from the Company to each Underwriter, but only with reference to written information relating to such Underwriter furnished to the Company by or on behalf of such Underwriter specifically for inclusion in the documents referred to in the foregoing indemnity, it being understood and agreed that the only such information furnished by or on behalf of any Underwriter consists of the information described as such in the letter agreement between you and the Underwriters dated the date hereof. This indemnity agreement will be in addition to any liability that any Underwriter may otherwise have.

(c) Promptly after receipt by an indemnified party under this Section 8 of notice of the commencement of any action, such indemnified party will, if a claim in respect thereof is to be made against the indemnifying party under this Section 8, notify the indemnifying party in writing of the commencement thereof, but the failure so to notify the indemnifying party (i) will not relieve it from liability under paragraph (a) or (b) above unless and to the extent it did not otherwise learn of such action and such failure results in the forfeiture by the indemnifying party of substantial rights and defenses and (ii) will not, in any event, relieve the indemnifying party from any obligations to any indemnified party other than the indemnification obligation provided in paragraph (a) or (b) above. The indemnifying party shall be entitled to appoint counsel of the indemnifying party’s choice at the indemnifying party’s expense to represent the indemnified party in any action for which indemnification is sought (in which case the indemnifying party shall not thereafter be responsible for the fees and expenses of any separate counsel retained by the indemnified party or parties except as set forth below); provided, however, that such counsel shall be satisfactory to the indemnified party. Notwithstanding the indemnifying party’s election to appoint counsel to represent the indemnified party in an action, the indemnified party shall have the right to employ separate counsel (including local counsel), and the indemnifying party shall bear the reasonable fees, costs and expenses of such separate counsel if (i) the use of counsel chosen by the indemnifying party to represent the indemnified party would present such counsel with an irreconcilable conflict of interest, (ii) the actual or potential defendants in, or targets of, any such action include both the indemnified party and the indemnifying party and the indemnified party shall have reasonably concluded that there may be legal defenses available to it and/or other indemnified parties which are different from or additional to those available to the indemnifying party, (iii) the indemnifying party shall not have employed counsel satisfactory to the indemnified party to represent the indemnified party within a reasonable time after notice of the

institution of such action or (iv) the indemnifying party shall authorize the indemnified party to employ separate counsel at the expense of the indemnifying party. An indemnifying party will not, without the prior written consent of the indemnified parties, settle or compromise or consent to the entry of any judgment with respect to any pending or threatened claim, action, suit or proceeding in respect of which indemnification or contribution may be sought hereunder (whether or not the indemnified parties are actual or potential parties to such claim or action) unless such settlement, compromise or consent (A) includes an unconditional release of each indemnified party from all liability arising out of such claim, action, suit or proceeding, and (B) does not include a statement as to, or an admission of, fault, culpability or a failure to act by, or on behalf of, any indemnified party.

(d) In the event that the indemnity provided in paragraph (a) or (b) of this Section 8 is unavailable to or insufficient to hold harmless an indemnified party for any reason, the Company and the Underwriters severally agree to contribute to the aggregate losses, claims, damages and liabilities (including legal or other expenses reasonably incurred in connection with investigating or defending the same) (collectively “Losses”) to which the Company and one or more of the Underwriters may be subject in such proportion as is appropriate to reflect the relative benefits received by the Company and by the Underwriters from the offering of the Securities (except as may be provided in any agreement among underwriters relating to the offering of the Securities); provided, however, that in no case shall any Underwriter be responsible for any amount in excess of the underwriting discount or commission applicable to the Securities purchased by such Underwriter hereunder. If the allocation provided by the immediately preceding sentence is unavailable for any reason, the Company and the Underwriters severally shall contribute in such proportion as is appropriate to reflect not only such relative benefits but also the relative fault of the Company and of the Underwriters in connection with the statements or omissions which resulted in such Losses, as well as any other relevant equitable considerations. Benefits received by the Company shall be deemed to be equal to the total net proceeds from the offering (before deducting expenses) received by it, and benefits received by the Underwriters shall be deemed to be equal to the total underwriting discounts and commissions, in each case as set forth on the cover page of the Final Prospectus. Relative fault shall be determined by reference to, among other things, whether any (1) untrue or any alleged untrue statement of a material fact or the omission or alleged omission to state a material fact or (2) a misrepresentation (as defined by Canadian Securities Laws) relates to information provided by the Company on the one hand or the Underwriters on the other, the intent of the parties and their relative knowledge, access to information and opportunity to correct or prevent such untrue statement or omission. The Company and the Underwriters agree that it would not be just and equitable if contribution were determined by pro rata allocation or any other method of allocation which does not take account of the equitable considerations referred to above. Notwithstanding the provisions of this paragraph (d), no person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Act)

shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. For purposes of this Section 8, each person who controls an Underwriter within the meaning of either the Act or the Exchange Act and each director, officer, employee and agent of an Underwriter shall have the same rights to contribution as such Underwriter, and each person who controls the Company within the meaning of either the Act or the Exchange Act, each officer of the Company who shall have signed the Registration Statement and each director of the Company shall have the same rights to contribution as the Company, subject in each case to the applicable terms and conditions of this paragraph (d).

9. Default by an Underwriter. If an Underwriter shall fail to purchase and pay for any of the Securities agreed to be purchased by such Underwriter hereunder and such failure to purchase shall constitute a default in the performance of its obligations under this Agreement, the remaining Underwriter shall not be obligated to take up and pay for the Securities which the defaulting Underwriter agreed but failed to purchase; provided, however, the remaining Underwriter shall have the right to purchase some or all, but shall not be under any obligation to purchase any, of the Securities, in its sole discretion and if such non-defaulting Underwriter does not purchase some of the Securities, this Agreement will terminate without liability to the non-defaulting Underwriter or the Company. In the event of a default by any Underwriter as set forth in this Section 9, the Closing Date and any settlement date shall be postponed for such period, not exceeding five Business Days, as the non-defaulting Underwriter shall determine in order that the required changes in the Registration Statement and the Final Prospectus or in any other documents or arrangements may be effected. Nothing contained in this Agreement shall relieve any defaulting Underwriter of its liability, if any, to the Company and any non-defaulting Underwriter for damages occasioned by its default hereunder.

10. Termination.

(a) This agreement shall be subject to termination in the absolute discretion of the Underwriters, by notice given to the Company prior to delivery of and payment for the Securities, if at any time prior to such time (a) trading in the Company’s Common Stock shall have been suspended by the Commission, the NYSE Amex or the Toronto Stock Exchange or trading in securities generally on the New York Stock Exchange or the NYSE Amex or the Toronto Stock Exchange shall have been suspended or limited or minimum prices shall have been established on such exchange, or (b) a general banking moratorium shall have been declared by Canadian or U.S. federal, New York State or Ontario provincial authorities or (c) there shall have occurred any outbreak or escalation of hostilities, or a declaration by the United States or Canada of a national emergency or war, major terrorist attack in a world commercial financial center, or other calamity or crisis, including a health epidemic, the effect of which on financial markets is such as to make it, in the sole judgment of the Underwriters, impracticable or inadvisable to proceed with the offering or delivery of the Securities as contemplated by any Preliminary Prospectus, any Preliminary Canadian MJDS Supplement, the Final

Prospectus or the Final Canadian MJDS Supplement (exclusive of any amendment or supplement thereto)

(b) Exercise of Termination Rights. The rights of termination contained in Section 10(a) may be exercised by either of the Underwriters and are in addition to any other rights or remedies any of the Underwriters may have in respect of any default, act or failure to act or non-compliance by the Company in respect of any of the matters contemplated by this Agreement or otherwise. In the event of any such termination, there shall be no further liability on the part of the Underwriters to the Company or on the part of the Company to the Underwriters except in respect of any liability which may have arisen prior to or arise after such termination under Sections 8 and 14. A notice of termination given by an Underwriter under Section 10(a) shall not be binding upon any other Underwriter who has not also executed such notice.

11. Representations and Indemnities to Survive. The respective agreements, representations, warranties, indemnities and other statements of the Company or its officers and of the Underwriters set forth in or made pursuant to this Agreement will remain in full force and effect, regardless of any investigation made by or on behalf of any Underwriter or the Company or any of the officers, directors, employees, agents or controlling persons referred to in Section 8 hereof, and will survive delivery of and payment for the Securities. The provisions of Sections 7 and 8 hereof shall survive the termination or cancellation of this Agreement.

12. Notices. All communications hereunder will be in writing and effective only on receipt, and, if sent to the Underwriters, will be mailed, delivered or telefaxed to (a) GMP Securities L.P., 000 Xxxx Xxxxxx Xxxx, Xxxxx 000, Xxxxxxx, Xxxxxxx, Xxxxxx M5H 1J8, attention: Xxxxx Xxxx (fax no.: (000) 000-0000) and (b) Xxxxxxx Xxxx & Company, LLC, 000 Xxxx 00xx Xxxxxx, 00xx Xxxxx, Xxx Xxxx, XX 00000, attention: Xxxxxx Xxxxxxxx (fax no.: (000) 000-0000), with a copy to Xxxxxxxx Xxxxxxx LLP 000 Xxxxxxx Xxxx Xxx, Xxxxx 0000, Xxxxxxxx Xxxxx, Xxxxxxxx 00000, attention: Xxxxxx X. Xxxx (fax no.: (000) 000-0000); or, if sent to the Company, will be mailed, delivered or telefaxed to US Gold Corporation, 00 Xxxxxx Xxxxxx 0xx Xxxxx, Xxxxxxx, Xxxxxxx, Xxxxxx XX0 0X0, attention: Xxx XxXxxx, (fax no.: (000) 000-0000), with a copy to Xxxxx & Xxxxxxx, L.L.P., 0000 Xxxxxxxxxxx Xxxxxx, Xxxxx 0000, Xxxxxx, Xxxxxxxx 00000, attention: Xxxxxx Xxxxxxx (fax no.: (000) 000-0000) and to Fraser Xxxxxx Casgrain LLP, 1 First Canadian Place, 000 Xxxx Xxxxxx Xxxx, Xxxxxxx, Xxxxxxx, Xxxxxx X0X 0X0, Attention: Xxxxxxx Xxxxxxxx, (fax no.: (000) 000-0000).

13. Successors. This Agreement will inure to the benefit of and be binding upon the parties to this Agreement and their respective successors and the officers, directors, employees, agents and controlling persons referred to in Section 8 hereof, to the extent set forth in Section 8 hereof, and no other person will have any right or obligation hereunder.

14. Severability. If any provision of this Agreement is determined to be void or unenforceable in whole or in part, it shall be deemed not to affect or impair the validity of

any other provision of this Agreement and such void or unenforceable provision shall be severable from this Agreement.

15. Applicable Law. This Agreement will be governed by and construed in accordance with the laws of the State of New York applicable to contracts made and to be performed within the State of New York.

16. Counterparts. This Agreement may be signed in one or more counterparts, each of which shall constitute an original and all of which together shall constitute one and the same agreement.

17. Headings. The section headings used herein are for convenience only and shall not affect the construction hereof.

18. Definitions. The terms that follow, when used in this Agreement, shall have the meanings indicated.

“Act” shall mean the U.S. Securities Act of 1933, as amended, and the rules and regulations of the Commission promulgated thereunder.

“Applicable Time” shall mean 6:30 a.m. (New York City and Toronto time) on May 13, 2009.

“Base Prospectus” shall mean the base prospectus referred to in Section 1(a) hereof contained in the Registration Statement at the Effective Date.

“Business Day” shall mean any day other than a Saturday, a Sunday or a legal holiday or a day on which banking institutions or trust companies are authorized or obligated by law to close in New York City and Toronto.

“Canadian Securities Laws” means the securities acts or similar statues of the Canadian Jurisdictions and all applicable regulations, rules, policy statements, national instruments including the MJDS Rule, notices and blanket orders or rulings thereunder and includes any decision document providing for the eligibility of the Company to use the MJDS Rule;

“Commission” shall mean the U.S. Securities and Exchange Commission.

“Disclosure Package” shall mean (i) the Preliminary Prospectus or Preliminary Canadian MJDS Supplement used most recently prior to the Applicable Time, (ii) the Issuer Free Writing Prospectuses, if any, identified in Schedule II hereto, and (iii) any other Free Writing Prospectus that the parties hereto shall hereafter expressly agree in writing to treat as part of the Disclosure Package.

“Effective Date” shall mean each date and time that the Registration Statement, any post-effective amendment or amendments thereto became or becomes effective.

“Exchange Act” shall mean the U.S. Securities Exchange Act of 1934, as amended, and

the rules and regulations of the Commission promulgated thereunder.

“Execution Time” shall mean the date and time that this Agreement is executed and delivered by the parties to this Agreement.

“Final Canadian MJDS Supplement” shall mean the prospectus supplement relating to the Securities that was first filed pursuant to the MJDS Rule after the Execution Time, together with the Canadian MJDS Base Prospectus.

“Final Prospectus” shall mean the prospectus supplement relating to the Securities that was first filed pursuant to Rule 424(b) after the Execution Time, together with the Base Prospectus.

“Free Writing Prospectus” shall mean a free writing prospectus, as defined in Rule 405.

“Issuer Free Writing Prospectus” shall mean an issuer free writing prospectus, as defined in Rule 433.

“Material Adverse Effect” shall mean any event that (i) is reasonably likely to be expected to have a material adverse effect on the performance of this Agreement or the consummation of any of the transactions contemplated hereby; or (ii) could reasonably be expected to have a material adverse effect on the condition (financial or otherwise), prospects, earnings, business, assets, liabilities (contingent or otherwise) or properties of the Company and its subsidiaries, taken as a whole, whether or not arising from transactions in the ordinary course of business.

“Preliminary Canadian MJDS Supplement” shall mean any preliminary prospectus supplement to the Canadian MJDS Base Prospectus, including any amendment thereto, referred to in the preamble of this Agreement, which is used prior to the filing of the Final Canadian MJDS Supplement, together with the Canadian MJDS Base Prospectus.

“Preliminary Prospectus” shall mean any preliminary prospectus supplement to the Base Prospectus referred to in Section 1(a) hereof that is used prior to the filing of the Final Prospectus, together with the Base Prospectus.

“Registration Statement” shall mean the registration statement referred to in Section 1(a) hereof including exhibits and financial statements and any prospectus supplement relating to the Securities that is filed with the Commission pursuant to Rule 424(b) and deemed part of such registration statement pursuant to Rule 430B, as amended, on each Effective Date and, in the event any post-effective amendment thereto becomes effective prior to the Closing Date, shall also mean such registration statement as so amended.

“Rule 158”, “Rule 163”, “Rule 164”, “Rule 172”, “Rule 405”, “Rule 415”, “Rule 424”, “Rule 430B”, “Rule 433”refer to such rules under the Act.

“Significant Subsidiary” shall mean each significant subsidiary of the Company as defined by Rule 1-02 of Regulation S-X or listed on Exhibit D attached hereto.

19. Arm’s Length Transaction. The Company acknowledges and agrees that the Underwriters are acting solely in the capacity of an arm’s length contractual counterparty to the Company with respect to the offering of Securities contemplated hereby (including in connection with determining the terms of the offering) and not as a financial advisor or a fiduciary to, or an agent of, the Company or any other person. Additionally, neither Underwriter is advising the Company or any other person as to any legal, tax, investment, accounting or regulatory matters in any jurisdiction. The Company shall consult with its own advisors concerning such matters and shall be responsible for making its own independent investigation and appraisal of the transactions contemplated hereby, and the Underwriters shall have no responsibility or liability to the Company with respect thereto. Any review by the Underwriters of the Company, the transactions contemplated hereby or other matters relating to such transactions will be performed solely for the benefit of the Underwriters and shall not be on behalf of the Company.

This Agreement supersedes all prior agreements and understandings (whether written or oral) between the Company and the Underwriters, or any of them, with respect to the subject matter hereof.

[Signature Page to follow]

If the foregoing is in accordance with your understanding of our agreement, please sign and return to us the enclosed duplicate hereof, whereupon this letter and your acceptance shall represent a binding agreement between the Company and the several Underwriters.

	Very truly yours,


	US GOLD CORPORATION


	By:	/s/ PERRY ING
		Name: Perry Ing
		Title: Chief Financial Officer

The foregoing Agreement is hereby confirmed and accepted as of the date first above written.

GMP SECURITIES L.P.


By:	/s/ XXXXX XXXX
	Authorized Signatory


XXXXXXX XXXX & COMPANY, LLC


By:	/s/ XXXXXX XXXXXXXX
	Authorized Signatory

SCHEDULE I

Underwriters		Number of Underwritten Securities to be Purchased

GMP Securities L.P.		11,000,000
Xxxxxxx Xxxx & Company, LLC		11,000,000
Total		22,000,000

SCHEDULE II

SCHEDULE OF FREE WRITING PROSPECTUSES INCLUDED IN THE

DISCLOSURE PACKAGE

None.

EXHIBIT A

Selling Restrictions

(a) The Company agrees that the Underwriters will be permitted to appoint, at their sole expense, other registered dealers or brokers as their agents to assist in the distribution of the Securities. The Underwriters shall, and shall require any such dealer or broker, other than the Underwriters, with which the Underwriters have a contractual relationship in respect of the distribution of the Securities (a “Selling Firm”), to comply with the Canadian Securities Laws and the applicable provisions of the Act in connection with the distribution of the Securities and shall offer the Securities for sale to the public directly and through Selling Firms upon the terms and conditions set out in the Final Prospectus, the Final Canadian MJDS Supplement and this Agreement. The Underwriters shall, and shall require any Selling Firm, to offer for sale to the public and sell the Shares only in those jurisdictions where they may be lawfully offered for sale or sold.

(b) Notwithstanding the foregoing, an Underwriter will not be liable for any breach under this Exhibit A by another Underwriter if the Underwriter first mentioned is not itself also in breach of this Exhibit A.

(d) For the purposes of this Exhibit A, GMP shall be entitled to assume that the Securities are qualified for distribution in any Canadian Jurisdiction.

EXHIBIT B-1

Company U.S. Counsel Opinion

Xxxxx & Xxxxxxx LLP

1. The Company has the necessary corporate power and authority to execute and deliver the (i) Agreement and (ii) each of the Registration Statement, the Base Prospectus, the Preliminary Prospectus, the Final Prospectus and any Issuer Free Writing Prospectus (collectively, the “Prospectuses”), and the Canadian MJDS Base Prospectus, the Preliminary Canadian MJDS Supplement, the Final Canadian MJDS Supplement and any Issuer Free Writing Prospectus which is required to be executed and delivered to the Canadian Regulators in any Canadian Jurisdiction, (collectively, the “Canadian Prospectuses”). All necessary corporate action has been taken by the Company to authorize the execution and delivery by it of the Agreement and each Prospectus and Canadian Prospectus and the performance by the Company of its obligations thereunder. The Agreement has been duly authorized, executed and delivered by the Company.

2. When issued in accordance with the provisions of the Agreement, the Securities will be validly issued, fully paid and non-assessable.

3. Based solely upon telephone communications between an attorney of this firm and a member of the Securities and Exchange Commission (“SEC”) staff, the Registration Statement has become effective under the Securities Act. To our knowledge, no stop order suspending the effectiveness of the Registration Statement or suspending or preventing the use of the preliminary prospectus filed with the SEC on April 29, 2009 or any other prospectus filed pursuant to Rule 424(b) promulgated pursuant to the Securities Act (collectively, the “Prospectus”) has been issued and no proceedings for that purpose have been instituted or are threatened by the SEC. The required filings of the Prospectus pursuant to Rule 424(b) have been made in the manner and within the time period required by Rule 424(b).

4. On the Effective Date, the Registration Statement (except for the financial statements and supporting schedules included therein, as to which we express no opinion) did, and when the Final Prospectus is first filed in accordance with Rule 424(b) and on the date hereof, the Final Prospectus (and any supplement thereto) (except for the financial statements and supporting schedules included therein, as to which we express no opinion) complied or will comply, as applicable, as to form in all material respects with the applicable requirements of the Act; as of the Applicable Time and the date hereof, the Disclosure Package (except for the financial statements and supporting schedules included therein, as to which we express no opinion), complied or will comply, as applicable, as to form in all material respects with the requirements of the Act.

5. The execution, delivery and performance on the date hereof by the Company of the Agreement do not (i) violate the Corporation Act or the Articles of Incorporation or Bylaws of the Company, or (ii) violate any provision of Applicable Federal Law or any provision of Applicable State Law.

6. No approval or consent of, or registration or filing with, any federal governmental agency or any Colorado governmental agency is required to be obtained or made by the Company under Applicable Federal Law or Applicable State Law or under the Corporation Act in connection with the execution, delivery and performance on the date hereof by the Company of the Agreement.

7. The Securities have been authorized for listing by the NYSE Amex.

8. The Company is not, and immediately following the issuance and sale of the Securities and the application of the proceeds thereof as described in the Final Prospectus will not be, an ‘investment company’ within the meaning of the Investment Company Act of 1940, as amended.

Xxxxxxx & Xxxxx, P.C. (or local counsel with respect to Significant Subsidiaries incorporated outside of Colorado)

1. Each of the Company and its U.S. Significant Subsidiaries has been duly incorporated or organized, as the case may be, and is in good standing under the laws of the jurisdiction of its incorporation or organization with full corporate power and authority to own or lease, as the case may be, and to operate its properties and conduct its business as described in the Disclosure Package and the Final Prospectus

2. Each of the Company and its U.S. Significant Subsidiaries is duly qualified to do business as a foreign corporation under the laws of each jurisdiction which requires such qualification and in which the failure to qualify would have a Material Adverse Effect.

3. None of the issue and sale of the Securities, the execution and delivery by the Company of the Agreement and the consummation of any other of the transactions contemplated by the Agreement or the fulfillment of the terms thereof will conflict with, result in a breach or violation of, or result in the imposition of any lien, charge or encumbrance upon any property or assets of the Company or any of its subsidiaries pursuant to (1) the organizational documents of the Company or its subsidiaries, (2) the terms of any indenture, contract, lease, mortgage, deed of trust, note agreement, loan agreement or other agreement, obligation, condition, covenant or instrument which is either described in the Registration Statement, Disclosure Package and the Final Prospectus or filed or incorporated by reference as an exhibit to the Registration Statement or any document incorporated by reference in the Registration Statement, Base Prospectus, any Preliminary Prospectus and the Final Prospectus and governed by

the laws of Colorado or the federal laws of the United States, (3) the Colorado Business Corporation Act, or any U.S. federal or to our knowledge, any other U.S. statute, law, rule or regulation, or (4) to our knowledge, any judgment, writ, injunction, ruling, order or decree of any U.S. court, regulatory body, administrative agency, governmental body, arbitrator or other authority having jurisdiction over the Company or its subsidiaries or any of its or their properties.

4. The authorized capital stock of the Company conforms in all material respects to the description thereof contained in the Disclosure Package and the Final Prospectus. As of ·, 2009, and to the best of our knowledge, · shares of common stock and one share of Series A Special Voting Preferred Stock of the Company are issued and outstanding and · exchangeable shares of US Gold Canadian Acquisition Corporation are issued and outstanding. The outstanding shares of Common Stock have been duly and validly authorized and issued and are fully paid and non-assessable.

5. The Common Stock, including the Securities, are free of statutory preemptive rights and preemptive rights under the Company’s organizational documents and, to our knowledge, contractual preemptive rights, resale rights, rights of first refusal and similar rights.

6. Computershare Shareholder Services, Inc. has been duly appointed by the Company as the Transfer Agent and registrar for the Common Stock, including the Securities.

7. To our knowledge, except as described in the Registration Statement, the Disclosure Package and the Final Prospectus, no person has the right, pursuant to the terms of any contract, agreement or other instrument, to cause the Company to register under the Act any additional Common Stock not already registered or shares of any other share capital or other equity interest of the Company, or to include any such shares or interest in the Registration Statement, the Disclosure Package or the Final Prospectus or the offering contemplated thereby.

8. To our knowledge, the Company is not an “ineligible issuer” (as defined in Rule 405 under the Act) as of the eligibility determination date for purposes of Rules 164 and 433 under the Act with respect to the offering of the Securities contemplated by the Registration Statement, any Preliminary Prospectus and the Final Prospectus.

9. The statements in any Preliminary Prospectus and the Final Prospectus under the headings “Risk Factors — Risks Related to Our Company — Our ongoing operations and past mining activities are subject to environmental risks, which could expose us to significant liability and delay, suspension or termination of our operations”, “— Legislation has been proposed that would significantly affect the mining industry” insofar as such statements summarize U.S. legal matters, agreements, documents or proceedings discussed therein, are accurate summaries of such legal matters, agreements, documents or proceedings.

10. The statements in any Preliminary Prospectus and the Final Prospectus under the headings “Description of Common Stock” and in the Base Prospectus under the heading “Description of Securities We May Offer,” and “Description of Capital Stock” insofar as such statements purport to summarize the terms of the Company’s capital stock and Common Stock, constitute accurate summaries of the terms of the Company’s capital stock and the Common Stock in all material respects.

11. To our knowledge, no action, suit or proceeding by or before any court or governmental agency, authority or body, domestic or foreign, or any arbitrator involving the Company or any of its Significant Subsidiaries or its or their property is pending or, to the knowledge of the Company, threatened that (i) challenges the validity or enforceability, or seeks to invalidate or enjoin the performance of the, Underwriting Agreement or (ii) could reasonably be expected to have a Material Adverse Effect, except as set forth in the Disclosure Package and the Final Prospectus.

12. The documents incorporated by reference in the Registration Statement, the Prospectus and the Disclosure Package (except for the financial statements and supporting schedules therein, as to which we express no opinion)), when they were filed with the SEC, complied as to form in all material respects with the requirements of the Exchange Act.

EXHIBIT B-2

Canadian Counsel Opinion

1. Each Canadian Significant Subsidiary has been duly incorporated or organized, as the case may be, and is validly existing in good standing under the laws of the jurisdiction of its incorporation or organization with full corporate power and authority to own or lease its assets, as the case may be, and to operate its properties and conduct its business.

2. Each Canadian Significant Subsidiary is duly qualified or registered to do business as a foreign corporation and is in good standing under the laws of each jurisdiction which requires such qualification.

3. The Company is a reporting issuer, or the equivalent thereof in each of the Canadian Jurisdictions that recognizes the concept of reporting issuer status, and the Company is not included on a list of defaulting reporting issuers maintained by any of the Canadian Regulators that maintain such lists.

4. All documents have been filed, all requisite proceedings have been taken and all legal requirements have been fulfilled by the Company to qualify the Securities for distribution and sale to the public in each of the Canadian Jurisdictions through investment dealers or brokers registered under the applicable laws of the Canadian Jurisdictions who have complied with the relevant provisions of such applicable laws.

5. None of the issue and sale of the Securities, the execution and delivery by the Company of the Agreement and the consummation of any other of the transactions contemplated by the Agreement or the fulfillment of the terms thereof will conflict with, result in a breach or violation of, or result in the imposition of any lien, charge or encumbrance upon any property or assets of the Company or any of its subsidiaries pursuant to (1) the organizational documents of the Canadian Significant Subsidiaries, (2) the terms of any indenture, contract, lease, mortgage, deed of trust, note agreement, loan agreement or other agreement, obligation, condition, covenant or instrument which is either described in the Canadian MJDS Base Prospectus, the Preliminary Canadian MJDS Supplement and the Final Canadian MJDS Supplement or any document incorporated by reference in the Canadian MJDS Base Prospectus, the Preliminary Canadian MJDS Supplement and the Final Canadian MJDS Supplement and governed by the laws of the provinces of Canada and the applicable federal laws therein and identified in this opinion, or (3) the MJDS Rule, or any other Canadian statute, law, rule, or regulation.

6. No consent, approval, authorization, filing with or order of any governmental agency or body, or, to our knowledge, any court, or the approval of the Company’s shareholders, is required in Canada in connection with the transactions contemplated by the Agreement, except (1) such exemptive relief as has been obtained by the Company from the Canadian Regulators in connection with the requirement with respect to reconciliation of the Company’s financial statements pursuant to NI 71-101, and (2) such as may be required by the Toronto Stock Exchange.

7. The listing of the Securities on the Toronto Stock Exchange has been conditionally approved by the Toronto Stock Exchange, subject to the Company filing all of the documentation referred to in the letter of the Toronto Stock Exchange dated , 2009 on or before , 2009.

EXHIBIT C

Form of Lock-Up Agreement

Lock-Up Agreement

May , 2009

GMP Securities L.P.

Xxxxxxx Xxxx & Company, LLC

Ladies and Gentlemen:

This agreement (“Lock-Up Agreement”) is being delivered to you in connection with the underwriting agreement (the “Underwriting Agreement”) entered into by US Gold Corporation, a Colorado corporation (the “Company”), and you with respect to the offering (the “Offering”) of common stock, no par value per share, of the Company (the “Common Stock”). Capitalized terms used herein without definition shall have the respective meanings ascribed to them in the Underwriting Agreement.

The execution and delivery by you of this Lock-Up Agreement is a condition to the closing of the Offering. In consideration of the closing of the Offering and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned agrees that, for a period (the “Lock-Up Period”) beginning on the date hereof and ending on, and including, the date that is 90 days after the date of the final prospectus supplement relating to the Offering, the undersigned will not, without the prior written consent of both of GMP Securities L.P. and Xxxxxxx Xxxx & Company, LLC (i) offer, sell, contract to sell, pledge, transfer, assign or otherwise dispose of (including, without limitation, by making any short sale, engage in any hedging, monetization or derivative transaction) or file (or participate in the filing of) a registration statement, prospectus or other Canadian securities offering document, with the U.S. Securities and Exchange Commission or any Canadian Regulator (the “Commissions”) in respect of, or establish or increase a put equivalent position or liquidate or decrease a call equivalent position within the meaning of Section 16 of the U.S. Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the rules and regulations of the Commissions promulgated thereunder with respect to, any Common Stock or any other securities of the Company that are substantially similar to Common Stock, or any securities convertible into or exchangeable or exercisable for, or any warrants or other rights to purchase, the foregoing, (ii) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of Common Stock or any other securities of the Company that are substantially similar to Common Stock, or any securities convertible into or exchangeable or exercisable for, or any warrants or other rights to purchase, the foregoing, whether any such transaction is to be settled by delivery of Common Stock or such other securities, in cash or otherwise or (iii) publicly announce an intention to effect any transaction specified in clause (i) or (ii). The foregoing sentence shall not apply to (a) transfers of shares of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock disposed of as bona fide gifts, (b) transactions by the undersigned relating to shares of Common Stock or other securities acquired in open market transactions after the

completion of the Offering, (c) entry into written trading plans for the sale or other disposition by the undersigned of Common Stock for purposes of complying with Rule 10b5-1 of the Exchange Act (“10b5-1 Plans”), provided that no sales or other distributions pursuant to a 10b5-1 Plan may occur until the expiration of the Lock-Up Period, (d) transfers by the undersigned of shares of Common Stock or any security convertible into or exercisable or exchange able for Common Stock as a result of testate, intestate succession or bona fide estate planning, (e) transfers by the undersigned to a trust, partnership, limited liability company or other entity, the majority of the beneficial interests of which are held, directly or indirectly, by the undersigned, (f) distributions by the undersigned of shares of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock to limited partners or stockholders of the undersigned and (g) the exercise of an option or warrant or the conversion of a security outstanding on the date of this Lock-up Agreement by the undersigned pursuant to the Company’s stock option and stock purchase plans; provided that in the case of any such permitted transfer or distribution pursuant to clause (a), (d), (e), (f) or (g), each transferee or distribute shall sign and deliver a lock-up letter substantially in the form of this Lock-Up Agreement.

In addition, the undersigned hereby waives any rights the undersigned may have to require registration of Common Stock in connection with the filing of any registration statement or prospectus to be filed with the Commission by the Company. The undersigned further agrees that, during the Lock-Up Period, the undersigned will not, without the prior written consent of both of GMP Securities L.P. and Xxxxxxx Xxxx & Company, LLC, make any demand for, or exercise any right with respect to, the registration (or equivalent) of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock, or warrants or other rights to purchase Common Stock or any such securities.

If (i) during the period that begins on the date that is 15 calendar days plus three business days before the last day of the Lock-Up Period and ends on the last day of the Lock-Up Period, the Company issues an earnings release or material news or a material event relating to the Company or any of its material mineral properties occurs; or (ii) if prior to the expiration of the Lock-Up Period, the Company announces that it will release earnings results during the 16-day period beginning on the last day of the Lock-Up Period, then the restrictions imposed by this Lock-Up Agreement shall continue to apply until the expiration of the date that is 15 calendar days plus three business days after the date on which the issuance of the earnings release or the material news or material event occurs; provided, however, this sentence will not apply if, within three days of the termination of the Lock-Up Period, the Company delivers to both GMP Securities L.P. and Xxxxxxx Xxxx & Company, LLC a certificate, signed by the Chief Financial Officer or Chief Executive Officer of the Company, certifying on behalf of the Company that the Company’s shares of Common Stock are, as of the date of delivery of such certificate, are “actively traded securities,” within the meaning of Conduct Rule 2711(f)(4) of Financial Industry Regulatory Authority, Inc. Such notice shall be delivered in accordance with Section 12 of the Underwriting Agreement.

The undersigned hereby confirms that the undersigned has not, directly or indirectly, taken, and hereby covenants that the undersigned will not, directly or indirectly, take, any action designed, or which has constituted or will constitute or might reasonably be expected to cause or result in the stabilization or manipulation of the price of any security of the Company

to facilitate the sale or resale of the shares of Common Stock. The undersigned hereby authorizes the Company and its transfer agent, during the Lock-Up Period, to decline the transfer of or to note stop transfer restrictions on the stock register and other records relating to shares of Common Stock or other securities subject to this Lock-Up Agreement of which the undersigned is the record holder, and, with respect to shares of Common Stock or other securities subject to this Lock-Up Agreement of which the undersigned is the beneficial owner but not the record holder, the undersigned hereby agrees to cause such record holder to authorize the Company and its transfer agent, during the Lock-Up Period, to decline the transfer of or to note stop transfer restrictions on the stock register and other records relating to such shares or other securities.

The undersigned hereby represents and warrants that it has full power and authority to enter into this Lock-Up Agreement and that such agreement is enforceable against it in accordance with its terms.

This Lock-Up Agreement constitutes the entire agreement and understanding between and among the parties with respect to the subject matter of this Lock-Up Agreement and supersedes any prior agreement, representation or understanding with respect to such subject matter.

This Lock-Up Agreement shall be governed by and construed in accordance with the laws of the State of New York applicable to contracts made and performed within the State of New York.

* * *

If (a) the Company notifies you in writing that it does not intend to proceed with the Offering, (b) the registration statement filed with the Commission with respect to the Offering is withdrawn or (c) for any reason the Underwriting Agreement shall be terminated prior to the “time of purchase” (as defined in the Underwriting Agreement), this Lock-Up Agreement shall be terminated and the undersigned shall be released from its obligations hereunder.

[Signature Page to Follow]

EXHIBIT D

Significant Subsidiaries

Tonkin Springs Gold Mining Company, a Colorado corporation

U.S. Environmental Corporation, a Colorado corporation

US Gold Alberta ULC, an Alberta corporation

US Gold Holdings Corporation, a Delaware corporation

US Gold Canadian Acquisition Corporation, an Alberta corporation

Nevada Pacific Gold Ltd, a British Columbia corporation

Tone Resources Limited, a British Columbia corporation

White Knight Resources Ltd., a British Columbia corporation

Tonkin Springs LLC, a Delaware limited liability company

Tonkin Springs Venture Limited Partnership, a Nevada limited partnership

Pangea Resources, Inc., an Arizona corporation

Minera Pangeo S.A. de C.V., a Mexican corporation

Nevada Pacific Gold (US) Inc.

Nevada Pacific Gold (Utah), Inc.

Tone Resources (US) Inc.

White Knight Gold (US) Inc.

Cun Minerals Inc.

Quito Gold Corp

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US Gold Corporation 22,000,000 Shares Common Stock (no par value per share) Underwriting Agreement May 12, 2009

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