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DENISON MINES (USA) CORP. <br />2010 ANNUAL REPORT <br />West Sunday Mine - M-1981-021 <br />The West Sunday Mine resumed operations in May 2007. As of the date of this report, approximately <br />17,081 tons of ore were produced from the West Sunday Mine and shipped to Denison's White Mesa <br />Mill, located near Blanding, Utah. The West Sunday Mine was placed on temporary cessation status on <br />November 30, 2009. A notice of temporary cessation status is provided to the Division with this annual <br />report. <br />In March of 2008, the Division provided notification to Denison Mines that the West Sunday Mine is a <br />Designated Mining Operation. Denison initiated characterization of the waste rock and ore as a result of <br />this notification. In July and September, work plans for waste rock and groundwater analysis were <br />provided and approved by the Division. In August of this year, Denison conducted ore and waste rock <br />characterization sampling at the West Sunday Mine. A summary report of this analysis was provided to <br />the Division in January of 2009. In December 2008 and January of 2009 groundwater sampling wells <br />were installed and groundwater samples were collected from the underground workings. A proposed <br />Environmental Protection Plan (EPP) was completed in May of 2009, and the Division provided Denison <br />comments in August of 2009 and again in January of 2010. These comments have been addressed and a <br />revised EPP has been submitted to the Division as of the date of this report. <br />This EPP includes the results of the material characterization, drainage report, surface water, and partial <br />ground water evaluations. <br />Exploration drilling occurred in the spring and summer of 2009 in the area of the Sunday Mines Group, <br />and a total of 59 exploration drill holes were completed, closed, and reclaimed. Additional seeding may <br />be required in the fall of 2010; however, vegetation will be observed at that time to determine the success <br />of reclamation. <br />A Weed Management Plan consistent with the requirements of San Miguel County and the Department of <br />the Interior, Bureau of Land Management (BLM) was prepared for all of the Sunday Mines and approved <br />by the BLM in April of 2009. Denison is coordinating weed management activities with San Miguel <br />County for May of 2010. Reports on the weed management work conducted will be provided to the <br />Division upon completion. <br />All work completed at the West Sunday Mine in 2009 has been completed in conformance with approved <br />Division Mine Permits and Plans of Operation with the BLM. <br />No changes occurred in the Permit M-1981-021 area during the past year. Routine stormwater <br />inspections are ongoing as required by Denison's stormwater discharge permit with the Colorado <br />Department of Public Health and Environment (CDPHE). This routine maintenance was documented and <br />reported to CDPHE in the annual reporting required by the Colorado Discharge Permit held by Denison. <br />Updated mapping for the West Sunday Mine was provided with the EPP submittal, and no changes have <br />occurred at the sites since that time.