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90 01124 08 57 3 S03 385 9947 sRK DENVER 02 <br />• <br />MEMORANDUM <br />Steve Renner, Colorado Mined Land Reclamation Division <br />Cl ~'.~' <br />rROM: Anne 8aldrige, Steffen Robertson and Kirsten (U.S.), Inc. <br />BATE: January 24, 199D <br />UB~ECT: 5AN_LUIS PERMIT AMENDMENT. FILE ND. M-88-112. EXHIBIT L. RE <br />Enclosed are costs that I have put together for the channel construction <br />~~ Year b of the mining operation. The costs are based on excavating material <br />to create a channel to the spillway. The excavated channel will have 3H:1V side <br />5'ones and a bottom slope of O.5Y. The upper control section of the spillway will <br />~• need to be excavated, Once the spillway drops over the side of the hill, <br />;angel will be required. Since the spillway excavation will require moving <br />~. the material, the costs propose to haul the excavated material to the low Spot <br />in the tailings and fill this spot to an elevation of 8604. All the accompanying <br />calculations are included with this submittal. <br />1f ~e reach an agreement on the costs, Exhibit L will be revised to include <br />them. <br />''.~ cost of constructing the drainage channel in Year 6 is calculated as <br />551,365. Adding this number to the current reclamation cost calculation of <br />53,345,468. <br />Finally, I would like to point out the extremely conservative nature of <br />the reclamation cost calculations presented in Exhibit L. The costs assume a <br />worst ,air. of maximum disturbance without any concurrent reclamation. BMR has <br />commi'•+•,. to achieving concurrent reclamation, when possible. Some examples of <br />the ccr,;ervative costs relative to concurrent reclamation include the waste rock <br />disposal areas, The East Pit disposal area will be backfilled in Year 2 of the <br />mining operation, with reclamation currently scheduled to be completed by the <br />end of Year 3. Both Waste Rock Disposal Areas B and C will be completed by Year <br />3 or early in Year 4 and reclaimed by the end of Year 4. In addition, Waste Rock <br />Disposal Area A will likely also be completed and reclaimed by Year 6. Without <br />including Waste Rock Disposal Area A, an excess of $310,699 of bond fc~r grading <br />of these areas will be available by Year 6. <br />Please call me if you have any questions about these calculations. <br />