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EXHIBIT D - Gillette Mine <br /> Technical Revision to Exhibit D of the Mining Plan <br /> This Technical Revision JR) has been prepared to replace Exhibit D of the Department of Reclamation, <br /> Mining and Safety (DRMS), Permit No. M-1992-009 for the Gillette Mine (the mine). Changes to the <br /> original mining plan include relocation and improvements to the process ponds. The improvements will <br /> mitigate any potential process water releases by improving the structural integrity and functionality of the <br /> ponds. The changes will also provide a buffer zone and secondary containment to the west. <br /> EXHIBIT D - Mining Plan <br /> Conventional surface aggregate mining is expected to continue beginning in spring 2020, with completion <br /> of mining activities anticipated in fall 2040. Resources will be extracted using bulldozers and front-end <br /> loaders (or equivalent), with transport by truck and/or conveyor. Depending on the material to be mined, <br /> it may be sized at the extraction site using a portable, self-contained screening plant and/or transported to <br /> the on-site process and wash plant(the plant)for classification and fines removal. <br /> Extraction <br /> Gravel extraction in the central part of the permit area will proceed in a general northerly direction, with <br /> localized extraction to the south and east of the central part of the mine. In the south pit area, extraction <br /> will proceed to the south,then to the west. Gravel will be mined from approximately 32 acres of the 49.78 <br /> acre site. The approximate 15 acre willow-sedge wetland that traverses the central part of the site will not <br /> be mined. Location and flow in the stream channel in this part of the site varies because of beaver <br /> activities. <br /> Prior to resource extraction, topsoil will be removed and stored in close proximity to the mine process <br /> plant site (the plant; Sediment Pond Schematic)to minimize disturbance during the mining operation. The <br /> site will be mined for gravel in areas outside of the wetlands illustrated in the Pre-Mining Map (Permit <br /> No. M-1992-009, Exhibit C). The Exhibit D map shows areas of previous gravel mining and topsoil <br /> salvage. <br /> In excess of 250,000 cubic yards of aggregate removal are anticipated to depths of approximately 15 feet <br /> using conventional bulldozers and loaders. The mined material will be classified at the extraction area <br /> using a portable screening plant. If necessary, it will be transported to the plant by truck or conveyor for <br /> additional processing. The processed aggregate will be stored at the plant site until it is hauled away with <br /> end dump tractor-trailers or similar equipment. <br /> Processing and support facilities will include two portable crushers with classifying screens, two portable <br /> stacking conveyors, a diesel generator, and one mobile service trailer for storing oil. A scale and a 250 <br /> square-foot scale house are located at the mine entrance. <br /> Page 1 of 3 <br />