2002-07-31_REVISION - M1983033 - Laserfiche WebLink

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RECLAMATION COST ESTIMATE (EXISTING CONDITIONS) This estimate is in response to an inspection and bond evaluation request dated April 8, 2002. It will also serve at a document that can be used to compare current disturbance verses future disturbance on the permitted 50 acre limit. This reclama- tion cost estimate in based on the conditions that exist at the mine as of July 17, 2002. Figure L-1 shows how the east and north faces look at that time. The heavy lines are existing benches and the dashed line are the benches that would have to be constructed. Figures L-1, L-2 and L-3 should be used while reviewing TABLE 1. As of July 17 there were 38.19 acres t of disturbance in the mine, 20.55 acres t is commercial area needing only grading and shaping and 17.64 acres t is area needing resoiling and revegetation. Since the final reclamation plan calls for grading the floor of the mine as commercial area no topsoiling and revegetation is necessary on that area. At this time the activities that would be necessary to reclaim the mine, are grading and shaping the mine floor, blast- ing up to 6 benches on the mine face, resoiling the benches with 12 inches of growth medium and seeding the bench surfaces. in addition, the waste rock off the face would be piled and sloped along the base of the east face (toe slope) as the benches are created. Figure L-4 shows how we calculated the amount of grading needed to create this toe slope from the rough piles created ae the material is mined. The south and west sides of the mined area need no further work at this time. The south face (north side of Stage S) is stable according to the Geotechnical Report and the west area is currently benched as required by the Reclamation Plan. The growth medium area would need work on the slopes to reduce and stabilize them. Figure L-5 shows how we calculated the amount of work needed to grade the slopes on the growth medium pile. The material removed during the eloping would be used to resoil the benches and toe slope along with additional material needed from the pile. This will save the cost of having to handle it twice. Trees would then be planted on the benches. We have also included hauling costs to remove 35 loads of miscel- laneous equipment and scrap from the site and included demolition of 270 sq-ft of concrete pads (30 pads - 1•x3'x10•). Attached are sketch maps created from on site measurements take of exist benches and slopes for the north and east mine faces. The east face was broken into two areas for calculating the amount of material that will have to be removed to create the 8 benches. The benches are lettered A thru A in each figure and these designations match those in TABLE 1. Figures L-1 and L-2 show cross sections of the existing face configuration, how the face would look when benching is complete and how much material would have to be removed per linear foot for each bench. You can also see how the toe slope will be located on the bottom of the face. Since this toe slope is part of the wall area we have included it in the costs to resoil and revegetate it as if it were a bench.