2006-02-15_REVISION - M1995004 - Laserfiche WebLink

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DEPARTMENT OF ROAD & BRIDGE Ken Haynes • Road Superintendent Central Maintenance Facility 467 E. Topaz • P.O. Box 9 • Granby, Colorado 80446 Phone: 970-887-2123 Fax: 970-887-3168 February 10, 2006 TO: Carl Mount Division of Minerals and Geology RE: Amend Mining Plan Inspiration Point Pit FROM: Bill Clark Grand County Road & Bridge is requesting that EXI]IBIT D (Minine Plan) for the Inspiration Point Pit be amended to read in the following manner. The amended Plan will become active on April 15, 2006 and extend for the life of the mining operation. EXIIIBIT D Amended Mining Plan April I5, 2006 History of the Pit: This existing pit abuts a steep west facing slope on the east side of the permitted area. The previous mining method involved mining straight into the false slope until solid rock was encountered. As additional material [hen slid down the steep undermined slopes, that material would also be removed. This resulted in the creation of a steep, rock faced, highwall approximately 50' tall. Mining then progressed to the south, along the highwall. During the past yeaz the County has acted to rectify the situation by mining further back from the highwall leaving 2:1 slopes, and by placing fill material against the lower portions of the highwall. Mining Method to be Employed Effective April 15, 2006: The current pit boundaries encompass a total of 19.99 acres, as of January 2006 approximately ] 3.00 acres of this site has been disturbed. The potential material reserves of rock and soil are 500,000 cubic yards. Approximately 30,000 cubic yards will be mined and stockpiled per crushing event (crushing may be done annually or bi-annually to maintain sufficient stockpiles) In the future, Grand County will not mine any further into the hillside creating a highwall. Materials piled up against the existing highwall will not be removed. Mining will continue to the south a sufficient distance from the hillside to leave a slope no steeper than 1 3/.: 1(at no time shall the county mine at a degree of slope that is deemed to be unstable). The maximum seam thickness to be mined will be 25' - 30'. No mining will occur on slopes which are steeper than 57%. No permanent highwalls will be created. No slope steeper than 1 '/<: 1 will be created. The completed pit site will have a drainage grade to the northwest of at least 2%. During mining the existing 4X4 road to State Division of Wildlife lands will be kept open, though not necessarily in its present location.