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COLORADO <br /> Division of Reclamation, <br /> AV Mining and Safety <br /> Department of Natural Resources <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> September 30, 2014 <br /> Jason McGraw <br /> General Shale Brick, Inc. <br /> 1845 W. Dartmouth Ave. <br /> Denver, CO 80110 <br /> Re: Pioneer Mine; DRMS File No. -1977-252 <br /> Technical Revision No. 4,TR-0 <br /> Preliminary Adequacy Review <br /> Dear Mr. McGraw, <br /> The Division of Reclamation, Mining and Safety (Division) received Technical Revision — 4 <br /> (TR-04) for the above referenced site on September 17, 2014. The decision date for TR-04 is <br /> October 17, 2014. The Division has reviewed TR-04 and has the following comments: <br /> 1. Please provide a map which depicts the approximate location where the scrap brick will be <br /> backfilled. <br /> 2. Please indicate if the final contours which are depicted on the most recently approved <br /> Reclamation Plan Map will change. If so, provide a revised Reclamation Plan Map which <br /> shows the proposed topography of the area with contour lines of sufficient detail to portray <br /> the direction and rate of slope of all reclaimed lands. <br /> 3. The Division is concerned with the potential for sinkholes developing over the long term due <br /> to piping where voids occur and/or compaction is insufficient. The formation of sinkholes is <br /> not considered compatible with the a proved rangeland post-mining land use (reference Rule <br /> 3.1.5(9)(e). Per Construction Materi is Rule 3.1.5(9)(f), please provide additional detail on <br /> how the scrap brick will be blended with overburden material so that voids in the backfilled <br /> area do not occur. In addition, descr be how complete compaction of the backfilled material <br /> will be achieved with 5 to 10 foot lift . <br /> /w Ov.c0�O <br /> o <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br /> John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director \ 76 <br />