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DESERADO MINE <br /> BLUE MOUNTAIN ENERGY <br /> 3607 County Rd. 65 <br /> Rangely, CO 81648 <br /> (970)675-4300 <br /> fax (970)675-4399 <br /> RECEIVED <br /> October 21, 2025 Qcj 2 4 2025 <br /> Colorado Division of Reclamation, <br /> Mr. Clayton Wein Mining and Saftey <br /> Division of Reclamation, Mining and Safety <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> RE: Technical Revision #75 — Construction of a new buried slurry line within existing <br /> disturbance. Technical Adequacy Response 10/9/2025. <br /> Deserado Mine—Permit No. C-1981-018 <br /> Dear Clayton, <br /> As requested by the technical adequacy review of October 9, 2025 regarding TR-75, Deserado <br /> Mine is enclosing a packet of materials that responds to and resolves the items identified in the <br /> letter. <br /> Your original adequacy items and Deserado's response to them have been included below: <br /> • Please clarify the location of the samples taken that are listed on the Comprehensive <br /> Water Quality Review Table provided. Specifically, the sample locations of the Metals and WET <br /> Testing results provided. <br /> Response: The information has been provided vertically to correspond to the locations <br /> listed in the heading line that reads "#029 - #029 - Clarified Water — Slurry. All <br /> information provided immediately below each of those locations is from that specific <br /> location. Sample dates are provided immediately above the different groups of analyses. <br /> To answer your question specifically, the metals analysis is provided for location #029 <br /> sampled on 5/27/2025 and Clarified Water sampled on 3/23/2023. The Clarified Water <br /> samples were taken from the clarifier basin that simulates the water quality of the slurry <br /> minus the settleable solids portion of the slurry. The WET testing results from both <br /> locations sampled on 6/25/2025 have been provided. <br /> • The BD 2-3 Ponds and DP-1 weren't originally designed as containment ponds for slurry. <br /> The suspended solids and total iron results of the slurry are multiple orders of magnitude higher <br /> than the samples taken at the 029 outfall. It is understood that it is unlikely that the slurry reaches <br /> the ponds if there is a break, but if it does will it overwhelm the system's ability to treat water? <br /> Response: The material moved by the slurry line is identical to the material moved to the <br /> refuse piles. The only difference in the material would be the moisture content of that material. <br />