0000950152-06-002979 Sample Contracts

A.A.P.L. FORM 610 — 1989 MODEL FORM OPERATING AGREEMENT OPERATING AGREEMENT DATED October 1, 2005 OPERATOR: EnerVest Operating, L.L.C. CONTRACT AREA: Belden & Blake Corporation COUNTY OR PARISH OF __________, STATE OF MI, PA, OH, & NY

Operating Agreement • April 7th, 2006 • Belden & Blake Corp /Oh/ • Drilling oil & gas wells • Texas

• Contract Type
  Operating Agreement
• Filed
  April 7th, 2006
• Company
  Belden & Blake Corp /Oh/
• Industry
  Drilling oil & gas wells
• Jurisdiction
  Texas

This Addendum is attached to and made a part of that certain 1984 COPAS Onshore Model Accounting Procedure which is Exhibit C to that certain Operating Agreement dated October 1, 2005, by and between Belden and Blake Corporation and EnerVest Operating, L.L.C. (the contract operator).

FIRST AMENDMENT TO CREDIT AGREEMENT

Credit Agreement • April 7th, 2006 • Belden & Blake Corp /Oh/ • Drilling oil & gas wells • New York

• Contract Type
  Credit Agreement
• Filed
  April 7th, 2006
• Company
  Belden & Blake Corp /Oh/
• Industry
  Drilling oil & gas wells
• Jurisdiction
  New York

THIS FIRST AMENDMENT TO CREDIT AGREEMENT (this “First Amendment”) dated as of September 27, 2005, is among BELDEN & BLAKE CORPORATION, an Ohio corporation (“Borrower”); and BNP PARIBAS (“Lender”).