UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549 FORM 10-K Commission file number: 001-3473 "COAL KEEPS YOUR LIGHTS ON" "COAL KEEPS YOUR LIGHTS ON" HALLADOR ENERGY COMPANY (www.halladorenergy.com) Colorado 84-1014610 (State of incorporation) (IRS Employer Identification No.) 1183 East Canvasback Drive, Terre Haute, Indiana 47802 (Address of principal executive offices) (Zip Code) Issuer's telephone number: 812.299.2800 Securities registered pursuant to Section 12(b) of the Act: | Tit ...