0000950109-99-003342 Sample Contracts

CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, As Trustee FIRST SUPPLEMENTAL INDENTURE Dated as of September , 1999

First Supplemental Indenture • September 10th, 1999 • Mountain Gas Resources Inc/De • Natural gas transmission • New York

• Contract Type
  First Supplemental Indenture
• Filed
  September 10th, 1999
• Company
  Mountain Gas Resources Inc/De
• Industry
  Natural gas transmission
• Jurisdiction
  New York

EXHIBIT 1.1 Western Gas Resources, Inc. 10% Senior Subordinated Notes due 2009 guarancteed as to the payment of principal, premium, if any, and interest by

Purchase Agreement • September 10th, 1999 • Mountain Gas Resources Inc/De • Natural gas transmission

• Contract Type
  Purchase Agreement
• Filed
  September 10th, 1999
• Company
  Mountain Gas Resources Inc/De
• Industry
  Natural gas transmission

EXHIBIT 4.4 Western Gas Resources, Inc. 10% Senior Subordinated Notes due 2009 unconditionally guaranteed as to the payment of principal, premium, if any, and interest by

Exchange and Registration Rights Agreement • September 10th, 1999 • Mountain Gas Resources Inc/De • Natural gas transmission • New York

• Contract Type
  Exchange and Registration Rights Agreement
• Filed
  September 10th, 1999
• Company
  Mountain Gas Resources Inc/De
• Industry
  Natural gas transmission
• Jurisdiction
  New York

RECITALS

Exchange Agreement • September 10th, 1999 • Mountain Gas Resources Inc/De • Natural gas transmission • Texas

• Contract Type
  Exchange Agreement
• Filed
  September 10th, 1999
• Company
  Mountain Gas Resources Inc/De
• Industry
  Natural gas transmission
• Jurisdiction
  Texas