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GRAND COUNTY, CO 93972 12/22/94 0337 PM • • 00 . Ott PAGE 10 OF 43 SARA L ROSENE,RECOP.DER P.EC-FEE DOC-FEE AFL ' Inspiration Point Pit ' EXHIBIT D ' ~ Mining Plan History of the Pit: ' a This existing pit abuts a steep west facing slope on the east side of the permitted area. The previous mining a method involved mining straight into the talus slope until solid rock was encountered. As additional o m material then slid down the steep, undermined slopes, that material would also be removed. This resulted o w in the creation of a steep, rock faced, highwall approximately 50' tall. Mining then progressed to the south ' ' ~' along the highwall. During the past year, the County has acted to rectify the situation by mining further v back from the highwall leaving 2:1 slopes, and by placing fill material against the lower portions of the ' o highwall. o ~ Mining Method to be Employed: .w ' ~ The existing pit is approximately five (5) acres in size. The pit will be expanded to a total of 13.61 acres a within the 9.99 acre tract. The potential mineral material reserves of rock and soil are 165,000 cubic yards. Approximately 15,000 cubic yards will be removed per year. ' In the future, Grand Counl will not mine any further into the hillside creating a highwall. Materials piled up ~ against the base of the existing highwall will not be removed. Mining will continue to the south a sufficient a distance from the hillside to leave a slope no steeper than 3:1. The maximum seam thickness to be mined o ~ will be 25 - 30'. No mining will occur on slopes which are steeper than 20%. No permanent highwalls will ' o a be created. No slopes steeper than 3:1 will be created. The completed pit will have a drainage grade to O the northwest of at least 2%. During mining the existing 4 x 4 road to State Division of Wildlife lands will be kept open, though not necessarily in its present location. ' ~a N ~ Topsoil will be stripped to a depth of at least 12" and will be stockpiled around the perimeter of the pit. N ~ Topsoil will be seeded with native grass species to help preserve the soil's viability and to protect it from ~ o wind and water erosion. Grass, shrubs, and small trees will be stripped and incorporated into the topsoil ' ~ a piles or will be stockpiled separately for later use as a mulch. ~ ~ The pit area receives approximately 11-14" of precipitation per year. Surtace water is generally not present ' .~ a in the permit area. The mining operation will not intersect any sources of groundwater. During operations ~ < , the pit will be bermed with material piles or topsoil piles to contain any overland flow from storm events. rn rn ' The mine Yife is approximately ten (10) years. No mining will occur from November 15 to April 15 to avoid o ~ conflict with wildlife on their wintering areas. Due to the small staging area and pit area there will be limited ~ ~ sequential reclamation during operations. As mining progresses to the south, the staging area will also shift ' F a. toward the south. Reclamation work will begin at the north end of the project area and will progress toward z o the south as mining progresses and as space allows. a ~ ~ Mining equipment will consist of one crusher with a capacity of 180 tons per hour and usually one front end ' loader and one crawler tractor. The crawler tractor will push material dawn the slope to the northwest ~ where it will be loaded into the crusher by the front end loader. Crushed material will be stockpiled at the a a northwest end of the pit. Typically no more than eight truckloads will be hauled per day. ' c~ a A steel gate with warning signs will be placed at the entrance to the pit to restrict access to unauthorized personnel. The pit will be patrolled on a regular basis to inspect for damage and to remove litter and illegal dumping. All noxious weeds will be controlled by Grand County through an authorization with the BLM. No t inoperable equipment or equipment not related to the mining operation will be stored at the site. 1