2022-02-03_REVISION - C1981018 (2)

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subsidence. These structures are monitored at least twice per month for sampling, so any changes in stability, however unlikely, would be identified quickly. Rule 2.05.6(2)—Mitigation of Impacts of Mining/Fish and Wildlife 3. Please see the attached comment letter from the Bureau of Land Management regarding the restrictions on the timing of surface disturbances. Please address any comments or questions the BLM have outlined in their letter. Please provide the Division with any comments or responses to this letter. Deserado Mine Response: The applicable timing limitations for new disturbance of wildlife winter range habitat will not impact the areas of new disturbance as they will not be impacted until after May 1, 2022. Areas of new disturbance being affected will have a migratory bird nest survey, raptor survey, WRFO special status plant species survey, and prairie dog presence evaluation conducted prior to disturbance. Rule 4.05.9 Impoundments 4. Map 164 and Map 164A both need a scale bar. The designations "1 inch = 20 feet" or "1 inch= 100 feet" are not useful with digital maps. Please add this to the two maps. Deserado Mine Response: Scale bars have been added to both maps. 5. On Map 164A, it is not clear if the road should be shown as new disturbance with the dotted blue line. Please explain and update the map, if appropriate. Deserado Mine Response: Linear disturbances like roads are accounted for in a disturbance Table provided to assist in development of the cost estimate. Length of road between the existing disturbance area and the new disturbance area is included on the map and can be correlated with the value in the disturbance table. 6. In Illustration 61, page 3, the text states that the proposed pond will be on the north bank of Red Wash. That does not appear to be accurate. The text should be revised to say, "north bank of a tributary to Red Wash." Deserado Mine Response: The text has been revised as requested. 7. The text in Illustration 61 needs to explain how particle size distributions for the SEDCAD models were determined (both for the well pad and for the area draining to the pond). Deserado Mine Response: Information has been included in the sedimentology section of Illustration 61. This same issue has been raised and discussed previously, most recently with TR-72, and accepted by DRMS.