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L 0 R A D <br /> - td L t)'j 3-ICf and Sa to-ty <br /> 10 December 2019 <br /> TO: Steve Hinkemeyer,Forrest Luke and Graham Roberts,Trapper Mining, Inc. (TMI) <br /> CC: Jim Stark and Jared Ebert,Division of Reclamation,Mining and Safety(DBMS) <br /> Re: Trapper Mine,C-1981-010,Mine Plan Update(PR9) 10 December 2019 Meeting Discussion. <br /> Dear: Mr. Luke, <br /> Thank you for meeting with DBMS on Tuesday 10 December 2019 to discuss the mine plan update <br /> comprising PR9 and the N Pit mining scenario. As we discussed, below is a list of Rules applicable to our <br /> conversation pertaining to mining in the N Pit and backfilling and grading of the L Pit. Also,as we discussed <br /> DRMS is in the process of reviewing your latest submittal received on 27 November 2019 and will provide <br /> any applicable adequacy items to you as soon as possible. <br /> 1. N Pit highwall mining <br /> o Zero Subsidence, applicable performance standards of Rule 4.23 <br /> 2. N Pit out of pit spoil storage <br /> o Rule 4.14.1(2)(e) and(h) and Rule 4.14.2(1) <br /> o A certified engineering plan for the storage area addressing stability and drainage <br /> issues shall be submitted by TMI. <br /> 0 4.09 as applicable <br /> 0 4.10 as applicable <br /> 3. L Pit, approximate original contour (AOC) variance and the proposed revision to the post mine <br /> topography. The following rules shall be thoroughly addressed in any request for variance: <br /> 0 2.06.4—Requirements for Steep Slope Mining <br /> o Requires demonstration of compliance with Rule 4.27.3 <br /> 0 2.06.5—Variance from AOC for steep slope mining <br /> o Demonstrate compliance with Rule 2.06.5(2) <br /> ■ Requires demonstration of compliance with Rule 4.27.4 <br /> 0 4.14—Backfilling and Grading <br /> 0 4.27 Operations on Steep Slopes <br /> DRMS values the productive working relationship with TMI and looks forward to receiving your updated mine <br /> plan in the near future. <br /> Best Regards <br /> Robin Reilley,M.S. GISP <br /> Environmental Protection Specialist II <br /> 303.8663567 <br /> Robin.reilleykstate.co.us <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director * . <br />