EXHIBIT 1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned persons hereby agree to the joint filing on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the common stock of HALLADOR PETROLEUM COMPANY and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filing. In evidence thereof each of the undersigned, being duly authorized, hereby execute this Agreement on the date set forth below.

Date: September 25, 2009

YORKTOWN ENERGY PARTNERS VIII, L.P.
By:	Yorktown VIII Company LP,
	its general partner
By:	Yorktown VIII Associates LLC,
	its general partner
By:	/s/ Bryan H. Lawrence Bryan H. Lawrence, Member
YORKTOWN VIII COMPANY LP
By:	Yorktown VIII Associates LLC,
	its general partner
By:	/s/ Bryan H. Lawrence Bryan H. Lawrence, Member
YORKTOWN VIII ASSOCIATES LLC
By:	/s/ Bryan H. Lawrence Bryan H. Lawrence, Member