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<br /> <br />London Mountain Clean Up <br />July 2025 D-1 <br /> <br /> <br />Exhibit D Mining Plan <br />The London Mountain Clean Up will excavate prelaw waste piles throughout Mosquito Gulch and <br />reclaim these areas, removing sources of metals and sediment from Mosquito Gulch for the first time in <br />decades. While the mining plans for the London Mine 110D area are unaltered by this application, the <br />London Mountain Clean Up hopes to expand the efforts of the previously approved London Mine 110D <br />permit, which can be viewed in Appendix 1. The number of piles and possible targets for cleanup <br />operations present in the area prevents the identification of rigid disturbed area limits as usually occurs <br />with the mining of typical surface ore deposits. Therefore, the mining plans outlined in this exhibit will be <br />applied based on common site conditions found within the affected area. The conditions in the affected <br />area are broken into four mining environments: Vegetated Loose Ground, Non-Vegetated Loose <br />Ground, Vegetated Competent Ground, and Non-Vegetated Competent Ground. When a waste pile is <br />identified for cleanup, its mining and reclamation plan will be based on which condition it is found in. <br />This standardizes mining and reclamation procedures for ease of operations and CDRMS enforcement. <br />As detailed in Exhibit C in the London Mine 110D attached in Appendix 1, the waste rock will be sorted <br />and hauled off site. <br />Given the variability of size and location of piles, the reclamation financial warranty (bond) will be based <br />on a total disturbance area and maximum material to be moved for each year. The operation will disturb <br />no more than 20 acres at any given time: the cumulative size of all piles disturbed yet unseeded must <br />add up to less than this limit at any time. Similarly, the operation will have no more than 10,000 CY of <br />waste pile material requiring removal or regrading: the cumulative quantity of prelaw waste material <br />requiring handling for reclamation must add up to less than this limit at any time. This approach allows <br />the operator flexibility to target waste piles as they are advantageous to excavate while maintaining <br />clear enforceable permit limits covered by the bond that are enforceable by CDRMS. The approach <br />facilitates the cleanup of a broad area of Park County of prelaw mine waste without constant <br />administrative hurdles and minimum paperwork. <br />The mining plan described in this exhibit is shown on the Exhibit C maps. <br />1. Description of the Material to be Mined and Underlying Geology <br />The affected area is located in Park County, situated in the heart of the Colorado Mineral Belt. The <br />region lies within the Southern Rocky Mountains physiographic province, specifically <br />encompassing portions of the Sawatch Range and the upper Arkansas Valley. The target material <br />being mined is waste rock from prelaw mining in the region found in piles of various sizes. All <br />material mined as part of this operation has already been excavated and piled on natural ground. <br />No mining of native material will take place. <br />The bedrock geology of the area represents a complex sequence spanning millions of years. At its <br />foundation, Precambrian metamorphic and igneous rocks form the core of the mountains. These <br />are overlain by Paleozoic sedimentary sequences, dating from the Cambrian through