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developed Whirlwind Mine is the decline from the surface to the ore body, which does <br />not contain ore as it is in the non-mineralized Brushy Basin member of the Morrison <br />Formation. <br />Table 1 <br />Historical Radon-222 Emissions <br /> <br /> <br />Month/Year Ventilated Air <br />Volume <br />Million Liter Radon-222 <br />Concentration <br />Ci/L Radon-222 <br />Emission <br />Ci <br />September 2008 13,200 18.5 0.244 <br />October 2008 14,400 0.236 <br />November 2008 11,900 16.4 0.195 <br />December 2008 310 0.005 <br />January 2009 410 0.010 <br />February 2009 640 24.0 0.015 <br />March 2009 830 0.020 <br />April 2009 540 0.046 <br />May 2009 950 85.5 0.081 <br />June 2009 750 0.064 <br />July 2009 90 0.011 <br />August 2009 320 120.9 0.039 <br />September 2009 190 0.023 <br />October 2009 150 0.005 <br />November 2009 200 30.0 0.006 <br />December 2009 89 0.003 <br />pCi/L = picoCuries per liter <br />Ci = Curies <br />4.2 Estimated Future Emissions <br />Emission rates from future mining operations (Phase I through Phase III) were estimated <br />based on the currently exposed areas that will be retained and the new areas that will be <br />opened up during each phase. The percentage of exposed ore in each area was estimated <br />as follows. <br />• Currently exposed ore zone and stopes at 100% of the baseline emission rate; <br />• The Whirlwind decline at 0% of the baseline emission rate as it is completed in <br />the non-mineralized Brushy Basin member of the Morrison Formation; <br />12