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Chavers Mining Resource <br /> DRMS Permit No.M-2015-030 <br /> Amendment No.2(AM-02) <br /> November2022 <br /> Page 2 <br /> 6.4.4 EXHIBIT D - MINING PLAN <br /> 6.4.4 (A) DESCRIPTION OF THE METHOD(S) OF MINING <br /> Mining conducted employs conventional aggregate mining techniques including the use of <br /> excavators and loaders to excavate topsoil, overburden, and aggregate material. Mining is <br /> accomplished by utilizing dewatering trenches around the perimeter of the toe of mining slope to <br /> facilitate dry mining. Haul trucks move materials to be processed at a fixed gravel plant located <br /> on-site. Finished materials are stockpiled where they are loaded into trucks for removal off-site or <br /> to the concrete plant located in the southeastern corner of the site. <br /> 6.4.4 (B) EARTHMOVING <br /> The mining operation strips topsoil and overburden to expose the underlying raw aggregate <br /> material deposit. Topsoil is stockpiled on-site and seeded to establish a vegetated cover to <br /> minimize erosion until future reclamation use. Overburden material will be utilized as part of the <br /> mine backfill. Overburden material will typically be stockpiled temporarily(i.e., less than one [1) <br /> year) and used as backfill of earlier mine excavation areas. However, should mining operations <br /> call for overburden materials to be stored over one (1) year, the stockpiles will be seeded with <br /> reclamation seed mix to establish a vegetated cover to minimize erosion until future backfill use. <br /> The exposed raw aggregate material deposit will then be excavated and processed. <br /> The equipment used to conduct the earthmoving activities may include dozers,loaders,excavators, <br /> articulated haul trucks, water trucks, and scrapers for the mining and earth moving operations. <br /> Aggregate processing equipment includes feeders, a fixed plant gravel plant with crusher and <br /> screens, sand screw, wash plant, conveyors, stackers, and other miscellaneous processing <br /> equipment. <br /> 6.4.4 (C) WATER DIVERSIONS AND IMPOUNDMENTS <br /> The following discusses water diversions and impoundments at the Site: <br /> ■ Mine Pit Dewatering: Mining of the Site utilizes dewatering trenches around the <br /> perimeter of the toe of mining slope to facilitate dry mining. Water is directed into a <br /> pump basin(i.e., sedimentation pond) within the pit to settle out fines prior to being <br /> pumped for discharge(via enclosed pipe or dewatering trench)to the South Platte River <br /> at approved Outfalls 001-A or 003-A. <br /> ■ Wash Plant: Wash plant water is recycled in a continuous loop using on-site <br /> sedimentation ponds. Water for the wash plant is pumped from an on-site sedimentation <br /> pond. The used wash plant water is directed to another on-site sedimentation pond to <br /> allow suspended sediment to settle out. The settled wash plant water is then transferred <br />