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6.4.4 Exhibit D <br /> Mining Plan <br /> The Ghost River Gravel Pit is an existing site of 9.9 acres. This application package will <br /> convert the current 110 Permit, M2003-002, to a Construction Materials 112C. In addition, 3.6 <br /> acres will be added to the permit to incorporate disturbed areas outside of the current <br /> permitted area. Access to the site will be from Huerfano County Road 110 at the southeast <br /> corner of the site. <br /> The site consists of the Manvel-Minnequa loams, 1 to 5 percent slopes, Kim fine sandy <br /> loan, 3 to 9 percent slopes, Penrose-Minnequa complex, 4 to 25 percent slopes and Penrose- <br /> Rock outcrop complex, 4 to 25 percent slopes. The target gravel source is located beneath <br /> limited topsoil of 0-6 inches and overburden of an additional 18 inches-8 feet. Topsoil and <br /> overburden will be saved for reclamation of the mine site. The primary commodities of this site <br /> are landscape aggregate, gravel and road base. Incidental materials not used for construction <br /> material will be used to reconstruct the pit floor and lessen the pit slopes. <br /> The life of the proposed operation is difficult to quantify due to the changing economic <br /> conditions in the construction industry. Extraction will be limited to 70,000 tons per year. At <br /> this rate, the life of the mine would be approximately 3-5 years depending on local economic <br /> conditions. <br /> Mining will proceed to the north of the current processing area. Extracted material will <br /> be moved to the processing area that is anticipated to be in the central portion of the pit. <br /> Earthmoving will be accomplished using front end loaders. Aggregate will be processed and <br /> sized using a crusher and screens. Mining will stay at least 25 feet from the San Isabel Power <br /> Pole located within the permit boundary. <br /> All plant growth material and topsoil will be salvaged and stockpiled for reclamation <br /> use. These stockpiles will be located at the perimeter of the site and posted as reclamation <br /> topsoil. Waste rock and overburden will be stockpiled and used to rebuild the pit floor and <br /> slopes during reclamation. Established stockpiles will be stored onsite and seeded with the <br /> approved seed mix to reduce the chance of erosion. These stockpiles will be located separate <br /> from the landscape aggregate and gravel stockpiles. <br /> Overburden perimeter stormwater berms will be constructed as excavation and <br /> reclamation progresses. These berms will serve to control erosion and keep sedimentation <br /> from reaching any drainage. Water for dust suppression will be purchased from a local source <br /> and hauled onsite. <br /> There will be no storage of fuel or lubricants onsite. Fuel will be hauled onsite as <br /> needed by vendor trucks. <br /> Page 5 of 21 <br />