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COLORADO <br />Division of Reclamation, <br />Mining( and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />September 1, 2015 <br />Brian Watterson, P.G. <br />Twentymile Coal Company <br />29515 Rout County Road #27 <br />Oak Creek, CO 80467 <br />RE: Foidel Creek Mine; C-1982-056 <br />Twentymile Mine Exploration Drill Hole Abandonment Report Review <br />Dear Mr. Watterson: <br />The Colorado Division of Reclamation, Mining, and Safety (Division) has reviewed the above reference <br />report dated June 8, 2015. The report documents the abandonment of the following exploration drill <br />holes: WC001, WC003, WC004, WC005, WC007, WC008, WC009, WC010, WCO11, WC012, WC013, <br />WC014, WC015, WC016, WC017, WC018, WC018R, WC019, WC019R, WCO20, WCO22, and WCO26. <br />The report was reviewed for compliance with Rule 4.07.3 of the Regulations of the Colorado Mined Land <br />Reclamation Board for Coal Mining. The report contains all of the required information from Rule <br />4.07.3(3) except for item (h). Please provide the name of the drilling contractor and the license number of <br />the drill and rig used to seal the coreholes. <br />The amount/volume of cement used for each hole was reported as gallons. Based on our discussion, it <br />appears the volume reported for each drill exceed the volume that was necessary for each hole and the <br />excess material was placed in an adjacent pit and then transported elsewhere to be used. hi the future, <br />please report only the volume used to seal each hole. <br />Rule 4.07.3(3) requires that proof of compliance of permanent sealing of drill holes be submitted within <br />60 days after abandoning a drill hole, specific drilling program or when requested by the Division. In the <br />future, please submit the required proof of compliance within the 60 day timeframe. <br />If you have any questions feel free to contact me at (303) 866-3567, extension 8120. <br />Sincerely, <br />CW - <br />Jared <br />Ebert <br />Environmental Protection Specialist <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />John W. Hickentooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />