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August 23, 2011 <br />Z og ; P.E. <br />Environmental Engineer <br />Energy Fuels, Inc. <br />www.energyfuels.com <br />Attachments <br />Cc: F. Filas, Dick White (Energy Fuels) <br />Angilique Diaz, EPA Region 8 Indoor Air Program <br />S. Gerwe, Grand Junction BLM <br />R. Means, Colorado DRMS <br />J. Morris, Utah DAQ <br />Resources <br />RECEIVED <br />AUG 2 5 2011 <br />GRAND JUNG ilUly MELD OFFICE <br />DIVISION OF <br />RECLAMATION MINING & SAFETY <br />Mr. Joshua Rickard <br />U.S. Environmental Protection Agency <br />Office of Enforcement, Compliance and Environmental Justice <br />Mail Code: 8ENF -AT <br />1595 Wynkoop Street <br />Denver, CO 80202 -1129 <br />Re: Start-up Notification, Whirlwind Mine, Mesa County, Colorado <br />A4-a0,0— 0411/ <br />Dear Mr. Rickard, <br />This letter serves as the start-up notification for the Whirlwind Mine. This notification is <br />required by Section V.A.2 of the Whirlwind Mine Approval for Construction. <br />Ventilation of the Whirlwind Mine commenced on September 10, 2008. The Whirlwind <br />Mine is currently on stand -by and is only ventilated as necessary to perform maintenance <br />tasks inside the mine The radon levels in the mine are currently very low. Non - <br />ventilated mine air was recently measured at 0.173 working levels, or approximately 1.7 <br />pCi/L at an efficiency of 0.5). These levels are low because the ore zone of the mine is <br />completely flooded. The primary purpose for ventilating the mine is not to control radon <br />levels, but to control diesel particulate matter (dpm) levels and to comply with MSHA <br />regulations. <br />Currently there are no immediate plans to dewater and start active mining at the <br />Whirlwind Mine. Energy Fuels will provide notification of start of active mining at such <br />time that it is planned. Please contact me or. Frank Filas, Director of Environmental and <br />Regulatory Affairs, should you have any questions or need additional information. <br />Sincerely <br />44 Union Blvd., Suite 600 <br />Lakewood, Colorado 80228 <br />Phone: 303 -974 -2140 <br />Fax: 303 -974 -2141 <br />6e/4 <br />2 011 <br />DiVi n of F ecl <br />�l intn g and 05 S e I, <br />SEP <br />