Molycorp, Inc. 5619 DTC Parkway Suite 1000 Greenwood Village, CO 80111 The Selling Stockholders referred to in Schedule I hereto Computershare Trust Company, N.A., as Custodian 250 Royall Street Canton, MA 02021 Attention: Stephanie Manzanares Dear...

Exhibit 10.19

June 10, 2011

Molycorp, Inc.
0000 XXX Xxxxxxx Xxxxx 0000
Xxxxxxxxx Xxxxxxx, XX
00000

The Selling Stockholders referred to in Schedule I hereto

Computershare Trust Company, N.A., as Custodian
000 Xxxxxx Xxxxxx
Xxxxxx, XX 00000
Attention: Xxxxxxxxx Xxxxxxxxxx

Dear Sir/Madam:

As representatives of the several underwriters (the “Underwriters”) listed in Schedule III to the Underwriting Agreement dated June 9, 2011(the “Underwriting Agreement”) among Molycorp, Inc. (the “Company”), ourselves, as representatives of the Underwriters listed in Schedule III thereto, and the selling stockholders named in Schedule I thereto, we hereby advise you that the Underwriters have determined to exercise the option granted to them in the Underwriting Agreement to purchase 1,500,000 additional shares of the Company’s common stock.

The Underwriters designate June 15, 2011 as the Option Closing Date pursuant to the Underwriting Agreement.

[Signature Page Follows]

	Very truly yours, X.X. XXXXXX SECURITIES LLC XXXXXX XXXXXXX & CO LLC As representatives of the several Underwriters
	By:	X.X. Xxxxxx Securities LLC

		By:	/s/ Xxxx Xxxxxxxxx
		Name:	Xxxx Xxxxxxxxx
		Title:	Managing Director