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TRAPPER MINING <br />INC. <br />F.O. Box 187 <br />January 17, 2017 <br />EMAILED <br />Craig, Colorado 81626 <br />Ms. Robin Reilley <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Dear Ms. Reilley: <br />Please accept this letter as our response to the adequacy review letter of December 13, 2016. <br />(970)824-4401 <br />Division Comment: Based on DRMS review of the current mine plan, areas associated with the <br />Deacon/Jeffway Diversion are permitted for future disturbance. As such DRMS requests that <br />Trapper either: <br />a) Provide an analysis showing worst case scenario for the ditch as per Rule 4.05.3(2) <br />b) or, provide revised pages incorporating language into the Trapper mine plan/permit <br />document explicitly stating that the construction of the sediment ponds will completed, <br />functioning and incorporated into the permit prior to any additional disturbance or pit <br />advancement above the Deacon/Jeffway diversion ditch. <br />Trapper Response: Rule 4.05.3(2) directly addresses temporary diversion ditch structures. The <br />design requirements of such structures require they pass a 2 -year precipitation event. While the <br />Deacon/Jeffway diversion ditch is intended to be a temporary structure, Trapper did design and <br />build the structure for a 10 year 24 hour event per the requirements of our permit (Section <br />4.8.1.2.) If the ditch is subjected to the 2 year event it would be more than adequate for the <br />intended disturbance above it. <br />The current design includes all possible disturbance permitted under the current permit term for <br />Trapper Mine. Map M10B shows the currently proposed stripping limits; the extent of which is <br />shown with the 2017 Term of Permit Disturbance Boundary stripping area. This area may or may <br />not be stripped in 2017, as proposed stripping is based upon a projected production rate of 2.6- <br />mty of coal production. Trapper has not been producing at this rate and pit advancement has <br />slowed. The previously submitted response to this matter demonstrated the Curve Numbers used <br />