Exhibit 1.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Class A common stock, par value $0.01 per share of BRIGHAM MINERALS, INC., a Delaware corporation, and further agree that this Joint Filing Agreement be included as an exhibit to such joint filings. In evidence thereof, each of the undersigned hereby executes this Joint Filing Agreement as of February 14, 2020.

Yorktown Energy Partners XI, L.P.
By:	Yorktown XI Company LP,
	Its general partner
By:	Yorktown XI Associates LLC,
	Its general partner

By:	/s/ W. Howard Keenan, Jr.
Name:	W. Howard Keenan, Jr.
Title:	Manager

Yorktown XI Company LP
By:	Yorktown XI Associates LLC,
	Its general partner

By:	/s/ W. Howard Keenan, Jr.
Name:	W. Howard Keenan, Jr.
Title:	Manager
Yorktown XI Associates LLC
By:	/s/ W. Howard Keenan, Jr.
Name:	W. Howard Keenan, Jr.
Title:	Manager