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<br />April 1„ 2009 <br />ENERGY FUELS RESOURCES ? <br />CORPORATION <br />Mrs. Angelique Diaz <br />USEPA Region 8, Indoor Air Program <br />1595 Wynkoop St. <br />Mail Code: 8P-AR <br />Denver, CO 80202-1129 <br />(303) 312-6017 <br />Cx"tj <br />R-Eca . . <br />APR 17 2009 <br />l? Division of Reciamation, <br />mipft and Safety <br />RECEIVED <br />APR 0 6 2009 <br />GRAND ,IUM;'I tujq FIELD OFFICE <br />DIVISION OF <br />RECLAMATION MINING & SAFETY <br />01*1 tl? <br />Re: 2008 Radon Emissions Modeling for the Whirlwind Mine _ Aoo 7 _ o yy <br />Dear Mrs. Diaz, <br />Please see the attached 2008 Radon Emissions Modeling report for the Whirlwind Mine. <br />The Whirlwind Mine is an underground uranium mine located at 30100 ,5/10 Road in <br />Gateway, Colorado. The effective dose equivalent of radon exposure to the nearest <br />resident, school or office to an <br />underground uranium mine is required to be calculated by <br />40 CFR 61 Subpart B. The radon effective dose equivalent was calculated using the <br />COMPLY-R program. <br />The mine is operated by Mr. Jeff Osborn, General Manager and this report was prepared <br />by Zach Rogers, Environmental Engineer. Radon was measured using Landauer Radtrak <br />Environmental Monitors placed in the mine decline, near the portal. The mine portal. is <br />the only ventilation point of the Whirlwind Mine. The following parameters were used to <br />calculate the radon effective dose equivalent: <br />• The portal measures approximately 12' wide by 9' tall. <br />• The flow rate at the portal was measured at 41,000 cfm in September, October, and <br />November and 5,700 cfin in December (the mine was put on stand-by in late <br />November and less ventilation was required). <br />• The effluent temperature was assumed to be 55 OF (COMPLY-R default value). <br />• No ventilation effluent controls are used at the Whirlwind. Mine>. <br />• The nearest public receptor is a part-time resident, located approximately 600 meters <br />northwest of the mine portal. <br />• The nearest meat ;producing receptor is cattle grazing operations located <br />approximately 6 km west of the mine portal and the closest farms are approximately 7 <br />km northeast in the Town of Gateway. <br />• The average wind speed was assumed to be 2.0 m/s (COMPLY-R default value). <br />• The Whirlwind Mine began mining operations in September 2008. <br />• Average radon concentrations were measured at 18.5 pCi/L in September and 16.4 <br />pCiA, in October through December. <br />Energy Fuels, Inc.. 44 Unicrn Blvd., Suite 600 <br />vvw w.elle) FN-fi:r>r Is.{:om kakew'a od, Colorado 80228 <br />Phone: 303-974-2 3,10 <br />Fam 303-974.2141