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TRAPPER MINING INC. <br />P.O. Box 187 Craig, Colorado 81626 (970) 824-4401 <br /> <br /> <br /> <br /> <br />May 25, 2018 <br /> <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 /> <br />Re: Trapper Mining Inc., Permit No. C-1981-010, Technical Revision TR-119 <br /> Update to the 2018 Mine and Reclamation Plan <br /> Responses to DRMS Comments, Adequacy Review 1 and 2 <br /> <br />Dear Ms. Reilley: <br /> <br />Please accept this letter as our response to the adequacy review letters dated March 22 and April 9, 2018. <br />Items requiring a response have been copied below, Trapper’s comments follow each as applicable. <br /> <br />Revised permit materials have been included as follows: <br /> Page; 3-15a <br /> <br />DRMS Comments March 22, 2018 <br /> <br />1. For each topsoil stripping area, (haul road, N Pit and L Pit), please describe how stripped topsoil will be <br />handled and where it will be stored or deposited. <br /> <br />Trapper Response: Topsoil will be handled in accordance with Section 3.2 of the permit. In the L-Pit area <br />topsoil will either be removed and replaced on adjacent reclamation or stored in piles near future <br />reclamation west of the pit. In N-Pit topsoil will be removed and stored in nearby piles local to the pit <br />area. <br /> <br />2. Please describe and or illustrate where and how runoff from N Pit will be routed. <br /> <br />Trapper Response: All pit disturbance runoff will flow to the East Pyeatt sediment ponds. Minimal runoff <br />associated with the haulroad stripping and construction area will flow to the Grouse sediment ponds. <br />Some temporary diversion ditches may be used to carry flows from adjacent reclamation around the south <br />side of the pit during mining. Ditches would be temporary in nature and be designed and built using the <br />temporary ditch designs in section 4.8.1.2 of the permit. If larger structures are required they will be <br />evaluated at a later date. <br /> <br />3. Please demonstrate through SEDCAD or other means, the capacity of specified sediment ponds to treat <br />the runoff expected from N Pit stripped area. <br /> <br />Trapper Response: SEDCAD modelling for the East Pyeatt drainage was updated with the approval of <br />PR-05. Based on this model and the parameters used to complete it, new disturbance resulting from topsoil <br />stripping in 2018 will not be in excess of the original design. <br /> <br />A comparison was made of acres of active mining and disturbance in the SEDCAD model and current <br />conditions with N-Pit stripping included. In the model, active areas are given a curve number of 87. A