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ENERGY COMPANY <br />1801 CALIFORNIA STREET. SURE 4646 <br />DENVER. CO 80242 <br />September 24, 2018 <br />Division of Reclamation, Mining and Safety <br />C/O Rob Zuber, PE <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Keenesburg 2017 ARR Revision <br />Dear Mr. Zuber, <br />RECEIVED <br />SEP 2 8 2018 <br />Division of Recl m Y ion, <br />Mining & <br />As Coors Energy (CEC) and the Division have been discussing, there were several changes made to the <br />Annual Reclamation Report (ARR) summary sheet used to outline acreages for differing land uses at the <br />Keenesburg site. This form, page 99, of the 2017 AHR has been modified based on several factors <br />including a different view on what areas fall into the performance areas, modifications to phase release <br />areas, and a better understanding of the current mine status. <br />Key changes to the ARR form include: <br />• Areas Disturbed changed to 179.18 acres <br />• Areas backfilled and graded changed to 68.06 acres <br />• Phase 1 released changed to 313.98 acres <br />• Phase 2 released changed to 272.07 acres <br />• Phase 3 released changed to 263.70 acres <br />• Long-term mining and reclamation facilities changed to 43.54 acres <br />• Active mining areas changed to 64.61 acres <br />These acreages are current to the survey completed in October of 2017. A detailed review will be <br />completed after the October 2018 survey to verify these areas and to acknowledge the substantial work <br />completed during 2018 with regards to grading and top sand application. <br />Please review these and let CEC know if you have any questions. We are willing to review to make sure <br />the Division agrees with the values presented by CEC. I can be contacted at 303-927-3680 <br />Sincerely, <br />J�"4_el' <br />Ben Moline <br />General Manager, Coors Energy Company <br />