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EXHIBIT D - Mining Plan <br /> a) It is anticipated that sand and gravel excavation,processing(rock crushing and screening),and stockpiling at the <br /> Koskie site will commence upon receipt of approval from the Colorado Division of Mining and Geology and <br /> receipt of other necessary permits. Gravel excavation and processing will be seasonal with stockpiling of gravel <br /> for later County uses depending upon the local road repair and construction needs. While gravel excavation and <br /> processing is expected to be seasonal, it is anticipated that the material stockpiles will be hauled out of the site <br /> year round. The Koskie site should not be considered an intermittent operation. <br /> b) Excavation and stockpiling volumes are anticipated to be approximately 100,000 tons per year. The Koskie site <br /> likely has only 10 years or less of gravel and sand reserves. Approximately 30 acres(15 acres for stockpiling <br /> and processing and 15 acres for mining)will be disturbed during the initial phase of the mining operation. The <br /> area will be stripped so that the crushing and screen plants can be set up on the west end of the permitted area. <br /> Mining will start on the east end of the permitted area and progress to the west. It is anticipated that mining will <br /> be done using excavators, front end loaders, dozers, scrapers, and haul trucks. <br /> c) Topsoil thicknesses at the Koskie site are thin,typically less than 12(twelve)inches. Topsoil will be stockpiled <br /> at the location shown on the mine plan map(see Exhibit C2). The topsoil piles will be seeded to prevent erosion <br /> and loss of soil. <br /> d) The gravel deposits proposed to be mined are stream channel deposits associated with Lone Tree Creek, an <br /> ephemeral stream that is located approximately't/2 mile to the east of the Koskie site. Therefore,the thickness of <br /> overburden to be removed during gravel extraction is expected to be minimal. Minimal stockpiling of <br /> overburden is anticipated. Mined soils unsuitable for construction use will be separated from the mined gravels <br /> and may be stockpiled at the site. These soil stockpiles will be utilized for excavation backfill and site <br /> reclamation. <br /> e) The estimated thickness of gravel-bearing zones varies from between 0 and 15 feet thick at the Koskie site. No <br /> high wall mining is anticipated. <br /> f) Alluvium materials similar to the material being mined are located beneath the material to be mined. The water <br /> table is approximately 2 feet below the level to which Weld County will mine. To prevent the exposure of <br /> ground water, Weld County will not mine the alluvium materials located beneath the material to be mined. <br /> g) The enclosed mine plan map (Exhibit C2) shows the proposed locations for the haul road, gravel processing <br /> (crusher location), soil and gravel product stockpile areas. <br /> h) The dimensions of any significant disturbances are shown on the mine plan map as `limit of gravel mining area' <br /> and the gravel processing and soil stockpiling areas(see Exhibit C2). <br /> i) Weld County Road 120 extends east-west along the north edge of the Koskie site(see Exhibit C2). The gravel <br /> excavation and processing areas will be accessed from that county road. <br /> j) The Koskie property is located approximately %2 mile west of Lone Tree Creek which is an intermittent stream <br /> that is typically dry most months of the year. There are no irrigation structures or surface water impoundments <br /> existing or planned at the site. There is one well that is used for stock watering within 200 feet of the mine <br /> permit area. Water needs for gravel mining and processing operations are expected to minimal;water for dust <br /> control can be obtained and hauled from existing County-owned wells that have been decreed for the appropriate <br /> uses. Water from the nearby well will not be used for any County operations. Water used in mining and <br /> crushing operations and for dust control is estimated to not exceed approximately 4000 gallons per month during <br /> those operations. <br /> M:\Mining\Koskie\DRMS Application\Koskie Application Exhibits 7-9-14.doc <br /> 7/9/2014 <br />