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DEPARTMENT OF NATURAL RESOURCES <br />D Mome Pascoa Eaecubve Dueclor <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />Ric na~tl D Lamm <br />Governor <br />M E M O RAN D U M <br />28 July 1983 <br />TO <br />FROM <br />RE <br />Susan Mowry <br />Jim Pendleton <br />Trapper Mi ng's R ponse to Stipulation No. 3 - Permit No. C-010-81 <br />Pursuant to your request, I have reviewed Trapper Mining's repsonse to <br />Stipulation No. 3 placed upon its Permit for the Trapper Mine, issued on <br />December 31, 1982. Stipulation No. 3 required the submission of "A PLAN FOR <br />VERIFICATION OF THE 25% OVERBURDEN SWELL FACTOR PROJECTED BY THE PERMITTEE <br />FOR THE TRAPPER MINE." <br />Trapper Mining, Inc. has proposed an aerophotogrammetric and survey <br />analysis proceedure to verify the projected swell factor. Briefly, the <br />proposal consists of comparing pre-mining and post-mining topographies in four <br />selected test areas totalling 188 acres. The analysis will compare cross- <br />sectional lines and topography developed from 1975 aerial photography of the <br />pre-mined area with cross-sectional lines and tmmpography generated from aerial <br />photography to be flown this fall (August or September), following this <br />season's reclamation work completion. Trapper anticipates that the digitized <br />computer analysis will require approximately 60 to 75 days to complete. It <br />is the operators intention to submit the study results in January, 1984, <br />concurrent with the submission of the first required post-mining topographic <br />map of the mined area. <br />The proposal is acceptable as presented by the operator. I recommend <br />its approval. <br />cc: Brian Munson <br />• <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />• iii iiiiiiiiniiiiii <br />999 <br />