Mid-Con Energy Partners (MCEP) SC 13D Mid-Con Energy Partners / Yorktown Energy Partners VI ownership change

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 units representing limited partner interests in MID-CON ENERGY PARTNERS, LP 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: December 30, 2011

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