Exhibit 31.1

CERTIFICATION

I, Brent K. Bilsland, certify that:

1) I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K of Hallador Energy Company;

2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Date: June 12, 2020

/s/BRENT K. BILSLAND

Brent K. Bilsland, President, Chairman, and CEO