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COR-030000 Stormwater Management Plan <br />,' 2. SITE DESCRIPTION (§I.C.1) <br />a) Nature of the activity at the site (Permit Section (§) I.C.La): <br />The Sunday Mines are located in San Miguel County, Colorado and are permitted mining <br />operations producing ore that is mined for its uranium and vanadium content. The Sunday, <br />St. Jude, Topaz, and West Sunday Mines are active mining operation sites where mining has <br />occurred in the past and is currently underway or is planned for the near future. The <br />Carnation Mine is permitted for mining, and has produced uranium/vanadium ores in the <br />past, but is currently on temporary standby status. The general site locations of the mines are <br />shown on Figure 1 in Appendix B. <br />Mining at each of these mines has been historically conducted underground by means of <br />tracked and trackless equipment utilizing traditional room-and-pillar and open stope mining <br />techniques. Current mining techniques will be identical to those of prior mining efforts, <br />except only trackless equipment is utilized today. Mining at the Sunday Mines began in the <br />early 1950's and continued intermittently into the late 1990's. The most recent mining <br />campaign occurred in 1999 when approximately 81,500 tons of uranium and vanadium ore <br />were mined. During historic mining campaigns ore-grade minerals were shipped to the <br />White Mesa Milling Facility in Blanding, Utah for refinement and production of uranium and <br />vanadium concentrates. Barren development rock was retained and stockpiled at each mine's <br />waste rock area (WRA) where they remain stored at this time. <br />The current mine plan for the Sunday Mines will continue to be an underground operation, <br />however, some surface ground disturbance is necessary and requires evaluation within the <br />context of stormwater management and control. Surface disturbance at the mine sites will be <br />limited to the WRA, vent shafts and their access roads. Surface facilities are generally <br />located near the mine portals and shaft locations. There will be no processing activities on <br />any of the mine sites. The ore will be transported to the White Mesa Mill located near <br />Blanding, Utah. At closure, the WRA will be contoured, provided with a topsoil cover and <br />re-vegetated in accordance with the mining permit reclamation plan. In addition, stockpiling <br />of ore prior to shipment, ventilation borings & fans, multi-purpose (shop/warehouseloffice) <br />buildings, fuel tanks, electrical equipment, and mine roadways are surface aspects of the <br />active mining operations. <br />Appropriate BMPs will be used to minimize the impact of earth disturbing activities as <br />shown on the site plans in Appendix B. <br />b) The proposed sequence for major activities (§I.C.1.b): <br />The project will generally adhere to the following sequence. Best management practices <br />(BMPs) used as interim stabilization during active mining, including down-gradient controls <br />and a stabilized access road have already been installed. Mining excavation activity is <br />currently underway at the Sunday, St. Jude, Topaz, and West Sunday Mines. Surface activity <br />((` and disturbance is shown on the individual Stormwater Site Maps (Figures 2A, 2B, 2C, 21), <br />Denison Mines (USA) Corp. Sunday Mines SWMP <br />2