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RECE~'~ ~~~_ ~ <br />DEC 1 1 ZUU6 <br />MINING PLAN Division of ReGamatlon, EXHIBIT D <br />Mining and Safely <br />1. General Mining Plan <br />The gavel zone is approximately 60 feet thick in an alluvial deposit and is overlain by an <br />average of 6 inches of topsoil and overburden. As stated in the Introduction, mining began at the <br />site in 1994 and the top 25-30 feet of the deposit above water table was mined since that time. <br />Sideselopes aze approximately 2H:1 V or milder. The entire surface azea which will be disturbed <br />as a result of the mining of the Colona Pit has been disturbed prior to the submission of the <br />September 2006 amendment; the surface disturbance will not be changed in this amendment, <br />rather this amendment is to simply allow for United Companies to mine deeper and below the <br />local static water table. The local static water table is estimated to be approximately 2 feet below <br />the current pit bottom, or approximately 32 feet below the original surface. <br />As discussed in the Introduction, the berm around the western perimeter of the pit was removed <br />and contoured into a rolling landscape approximately 3-5 feet in height at the request of <br />Montrose County. Details for the landscaping of this berm can be seen in Map Exhibit C-4. This <br />berm is permanent. It has been vegetated by United. <br />Prior to the 2006 Amendment, mining was accomplished by dozer and front end loader removing <br />the raw gravel and loading the material into an in pit portable crusher and screen plant which <br />produced products of various sizes. Some material was taken to a portable asphalt plant which <br />was located in the Phase 1 azea and can be seen in the aerial photo on Map C-1. This plant has <br />since been removed and Phase 1 (above water table) is currently being mined in 2006. The <br />mining progressed from the northern edge of the permit azea in 1999 to the southern edge in <br />2005. Mining progressed from north to south by keeping the pit level approximately 2.0 feet <br />above groundwater at all times. Map C-1 shows the contours of the site after all mining above <br />water table in the pit was finished at the end of 2005. The Phase 1 azea, where the facilities were <br />located, was still not mined to the water table. <br />Colona Pit November 06 D-1 <br />