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Hydrogeological Evaluation of Sunday Mines Group <br />Introduction <br />0 Section 1 <br />Introduction <br />1.1 Purpose of Investigation <br />This investigation was conducted to provide information regarding hydrogeological <br />conditions at the Sunday Mines Group in accordance with a March 31, 2008 letter <br />from Denison Mines (USA) Corporation (Denison) to the Colorado Division of <br />Reclamation Mining and Safety (DBMS). <br />1.2 Location of Facilities <br />The Sunday Mines Group is located in San Miguel County, Colorado. The mines <br />produce uranium and vanadium ore from mineral deposits of the Uravan District, <br />which is one of the major uranium-producing mineral districts in the United States. <br />The ore is transported to a mill located near Blanding, Utah for mineral processing. <br />Mines in this area have been active on an intermittent basis since the 1950's. The <br />Sunday Mines Group includes: <br />¦ The Sunday Mine; <br />¦ The Carnation Mine; <br />• ¦ The West Sunday Mine; <br />¦ The St. Jude Mine; and <br />¦ The Topaz Mine. <br />The location of the Sunday Mines Group is shown on Figure 1-1. <br />The affected areas of the mines include "...the surface of an area within the state <br />where a mining operation is or will be conducted... (Colorado Revised Statutes Title <br />34, Article 32, Section 103 (CRS § 34-32-103)]. Facilities present within affected areas of <br />the Sunday Mine, the West Sunday Mine, the St. Jude Mine and the Topaz Mine are <br />similar with mine portals, development rock storage facilities, changing rooms, offices <br />and workshops present on all sites. The Carnation mine affected area currently only <br />includes a mine portal and two development rock storage areas with existing <br />vegetative growth on them. <br />The Sunday Mines Group also includes underground workings such as decline adits <br />leading into the mines from the affected areas, ventilation shafts, and various <br />underground stopes and drifts. The Carnation deposit is currently being mined <br />underground and the mine portal is a part of the Sunday Mines Group ventilation <br />circuit, but disturbance within the affected area of the mine is currently limited. The <br />cm 1-1 <br />7:\64988-Denison Mines\Task Order 3 - DMO Sampling and Analysis Plan\Task 3.14 - Hydrogeology ReportUnal sunday hydro reportlexr\FINAL Sunday Hydrogeology Report.doc