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6.4.4 Exhibit D <br />Mining Plan <br />Rock Gulch Gravel Pit began production in 1980 within an existing disturbance <br />of a gravel pit. The target deposit of gravel and cobble lies within gravelly alluvial <br />land and rough broken land, as described by the Soil Conservation Survey. The <br />primary commodity is gravel. Incidental material is sand. The average deposit <br />thickness is 35 feet. This will be a dry mining operation. <br />The proposed mine will operate five days a week for approximately 40 weeks <br />each year from sunrise to sunset. Mining and processing will be performed by a <br />licensed contractor. <br />The total permit area is 26.1 acres. The site is divided into two sections by <br />Chaffee County Rd 107. Gravel Pit Area 1, approximately 21.9 acres, will continue to <br />be the active mining area. Gravel Pit Area 2, composed of 4.2 acres, will be mined <br />after Pit Area 1 is mined out. The expected life of the mine is approximately 20 <br />years, depending on economic demand, with 18 years in Pit Area 1 and two years in <br />Pit Area 2. <br />The soils and vegetation descriptions provided by Chaffee Soil Conservation <br />District remain unchanged from the original approved 110 permit application. <br />Minimal plant growth medium is on site but all will be reserved and used for <br />reclamation. Overburden is approximately zero to six inches deep. Plant growth <br />medium, overburden and some fines will be used during reclamation. <br />Loaders and bulldozers will continue mining progressing from the north side <br />to the south side across the deposit. Mining will maintain perimeter 3H:1V slopes. <br />When necessary, the processing area, crushing and screening, will be located inside <br />the disturbance. <br />If necessary, stormwater perimeter diversions will be constructed of <br />overburden and reject material as required by Colorado Department of Public Health <br />and Environment's Water Quality Control Division. All diversionary structures will be <br />temporary and will be removed during reclamation. Since the mine is a pit, surface <br />water will naturally collect in the mine area. The pit floor grade has established a <br />pooling area for surface water to the north of the entrance road. <br />Revised January 5, 2011 <br />Page 6 of 24