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Background <br />The LP -21 Mine was originally permitted for its uranium/vanadium reserves in 1977. On <br />September 30, 1979, an amendment was approved to increase the affected acreage of the <br />mine from 9.9 to 13.2. Mining is not currently ongoing at LP -21. The mine waste area <br />has been re- contoured and seeded, the portal area has been reclaimed, and the <br />three ventholes have been plugged. <br />The uranium/vanadium deposits of the LP -21 Mine are Colorado Plateau "sandstone" <br />type deposits. There are a number of separate ore bodies distributed throughout the lease <br />tract, having a maximum thickness of 10 feet. They are generally located at the same <br />stratigraphic level, varying from 600 feet deep in the north end of the lease block to about <br />300 feet deep in the extreme south. <br />Ore bodies are commonly associated with the top rim sandstone of the Salt Wash <br />Member of the Morrison Formation. This stratum varies from a few feet to about 50 feet <br />thick. The Salt Wash Member consists of numerous sandstones interbedded with shale <br />and mudstone layers. <br />The uranium and vanadium bearing ore material mined at LP -21 will be sent to a mill to <br />be separated into concentrates of U3O8 and V2O5. <br />Boundary Changes <br />Cotter is requesting the release of undisturbed acreage associated with two ventholes and <br />a road. They consist of 0.87 acres in SW 1 /4 of NE 1/4 of section 27, 0.60 acres in NE 1/4 of <br />NE 1/4 of section 27, and 0.24 acres in SW 1/4 of SE 1 /a of section 22. Cotter is adding <br />acreage for 3 proposed ventholes and increasing the acreage associated with the surface <br />facility and waste area in order to include runoff control structures. See the Table of <br />Proposed Surface Disturbances found below in this exhibit. <br />Timeline <br />Exhibit D <br />Mining Plan <br />LP -21 Mine Permit Amendment <br />M -1977 -305 <br />The area to be worked at any one time will not appreciably increase after the initial <br />disturbance around the portal area. Small amounts of additional acreage may be involved <br />as the waste area grows, or additional roads for ventholes and development drilling are <br />needed. This land has been accounted for in the affected acreage. <br />Areas that may be classified as major disturbances include the waste dump and soil <br />stockpile. Moderate disturbances include the area required for stabilization of the waste <br />