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Electron Microprobe Analysis <br />Section 1 <br />Introduction <br />1.1 Background <br />1.1.1 Mining History <br />The Sunday Group and Van 4 mines are located in the Uravan Mineral Belt in southwest <br />Colorado. The Sunday Group mines consist of 5 underground uranium-vanadium <br />mines. The Sunday Group mines are all located on the south side of Big Gypsum Valley <br />in San Miguel County, Colorado. The Van 4 Mine is located approximately 10 miles <br />north of the Sunday Group mines in Montrose County, Colorado. The Van 4 mine is <br />located on Monument Mesa on the south side of Paradox Valley. <br />The Sunday Group mines are essentially developing the same uranium-vanadium <br />deposit. The mines are delineated based on claim ownership and permit status. The <br />Sunday Mines group includes: <br />• <br />• The Sunday Mine; • <br />• The Carnation Mine; <br />• The St. Jude Mine; <br />• The West Sunday Mine; and <br />• The Topaz Mine. <br />The Sunday Group mines have been operated on an intermittent basis since the mid <br />1950's. A decline adit, a small development rock area (DRA), and ancillary infrastructure <br />are present at each mine. Underground workings of the Sunday, Carnation, St. Jude, and <br />West Sunday mines are interconnected. These mines are currently active, and ore and <br />development rock are currently being extracted via the decline adits at the Sunday, St. <br />Jude, and West Sunday mines. Underground workings at the Topaz mine are not <br />currently interconnected with the other Sunday mines. <br />The Van 4 mine is not currently active, although production is planned to commence in <br />the future. The affected area of the mine includes a small development rock area, a <br />headframe, shaft portal, and other ancillary infrastructure. The headframe services a <br />vertical shaft that accesses existing underground mine workings. The uranium- <br />vanadium deposit present at the Van 4 is similar in nature to the Sunday Group deposit <br />and occurs in the same geological formation. • <br />1 <br />TA64986-Denison Mines\Task Ordcr 3 - DMO Sampling and Analysis Plan\Task 3.12 - Soil, Ore, Rock Data Assessment Repon\Bioavailability\DenisonEMPTmtO21709 (2).doc