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III IIIIIIIIIIIIIIII <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department o(Natural Resources <br />1313 Sherman 5t., Roam 215 <br />Denver, Colorado 80203 DIVISION O F <br />Phone: (303) 866-3567 MINERAL S <br />FAX: (303)832-8106 & <br />GEOLOGY <br />RECLAMATION <br />MINING•SAFETY <br />29 October 2001 Bill ovens <br /> Governor <br />Ms Kath Welt <br />y Greg E. Walther <br />ExecuUVe Director <br />Oxbow Mining, Ine. Michael B. Long <br />P.O. Box 535 Division Drredor <br />Somerset CO 81434 <br />RE: Additional PR-04 comments <br />Deaz Ms. Welt: <br />The Division has developed additional questions comments on the permit revision PR-04, <br />pertaining to those questions not completely addressed in the last comments. The <br />question numbers addressed by these comments are those concerning topsoil volume and <br />reclamation estimates, that is questions 33, 36, 38, 40, 50, 51, and 52. <br />The Division needs to know the contours underlying the topsoil piles as it is on such <br />steep terrain and we have no idea if the mine had cut any bench underneath the piles for' <br />increased storage. Therefore, if OMI can send a topo of the azeas where the topsoil piles <br />existed, we can perform our required calculations for the volume estimates.. <br />As far as a mass balance estimation, we will require an additional set of maps and -the <br />M-6 series (Final Topography). We request that OMI send these maps in electronic <br />format to harry.ranney@state.co.us. <br />Additionally, while viewing the maps in a cross section view, we have noted several <br />problems that would seriously affect any volume calculations if done with any CAD <br />program using this electronic map as a basis for their calculations. Some of these <br />problems are: <br />Numerous layers such as BLD-PRM, WALMSN, GRAVEL, etc had lines with <br />several different elevations associated with them, ie 3D lines. <br />2. The following layers are some of the layers that had lines with erroneous <br />elevations ranging from -6,290' to 13,695' <br />