Laserfiche WebLink
DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866 -3567 <br />FAX: (303) 832 -8106 <br />November 13, 2012 <br />Darren Gebhart <br />McAtee Construction Company <br />P.O. Box 1908 <br />Sterling, CO 80751 <br />STATE OF COLORADO <br />RE: Green Bros Pit No. 2; DRMS File No. M- 1995 -030; Adequacy Review — 02 (CN -01) <br />6.4.4 Exhibit D — Mining Plan <br />Mined Land Reclamation <br />COLORADO <br />D I V I S I O N O F <br />RECLAMATION <br />MINING <br />— &— <br />SAFETY <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Loretta E. Pined <br />Director <br />The Division has identified several other comments and questions that must be addressed prior to <br />the Division's decision due date. Please be advised that if you are unable to satisfactorily <br />address any concerns identified in this review before the decision date, it will be your <br />responsibility to request an extension of the review period. If there are outstanding issues <br />that have not been adequately addressed prior to the end of the review period, and no <br />extension has been requested, the Division will deny this application. <br />1. The Applicant has stated the natural angle of repose of the pit walls will be 2.5H:1V. Please <br />describe the basis for this assumption or otherwise demonstrate to the Division that the pit <br />walls will adhere to a 2.5H:1V grade during mining. Also, describe how the Operator will <br />verify that the mine face is maintained at 2.5H:1V for the proposed wet mining operation. <br />2. Please provide the Division with a typical cross section which shows the slope of the mining <br />face during active operations. The cross section should depict the point of maximum <br />disturbance when the top of the mine slope reaches the mining line. In addition, include the <br />25' offset and the permit boundary line. <br />3. The Applicant has stated that reject sand will pumped back into the pits. Please clarify if <br />there will be a single discharge point for each of the pits where the reject sand will be <br />pumped or if the sand will be pumped around the perimeter of the pits. If the reject sand will <br />be pumped at a single point, then specify the location. The Division recommends that reject <br />sand be pumped into the pits as far away from any permanent man -made structures as <br />possible, in order to increase the distance between blasting and said structures. <br />4. The Applicant has stated a 25' setback from the permit boundary will be maintained. In <br />addition, the Applicant has stated that the mining line will be maintained at a distance of 75' <br />inside of the 25' setback. Please commit to marking both the 25' setback and the mining line <br />in the field. <br />Office of Office of <br />Denver • Grand Junction • Durango Active and Inactive Mines <br />