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Summary of Quarterly Hydrological Monitoring <br />Monitoring Activities <br />The following field monitoring and sampling activities were performed during the First <br />Quarter 2011 (January through March 2011): <br />• February 7, 2011 - Field parameters and elevation of mine water in the <br />Whirlwind Mine Decline were measured and a sample collected for analysis. PR <br />Spring and DP Spring were not accessible during this visit due to deep snow pack. <br />• April 18, 2011 - DP Spring and PR Spring were measured for flow rate and field <br />parameters. Monitoring Well W-1 was measured for static water level. <br />¦ Whirlwind Treatment Plant <br />While the treatment plant is in operation, mine water from the Whirlwind Mine is <br />pumped to the surface, stored in the untreated water tank, treated and discharged to the <br />middle tributary of Lumsden Creek. Discharge of treated water from the Whirlwind <br />Mine is allowed in accordance with Colorado Discharge Permit System (CDPS) permit <br />i number CO-0047562. Following the December 2009 batch treatment of mine water, <br />collection of mine water for treatment was suspended at the Whirlwind Mine. Since then, <br />mine water has been allowed to accumulate in the mine workings. Refer to Section 1 of <br />t this report for a summary of mine water treatment. <br />Whirlwind Mine and Packrat Mine <br />The inflow within the Whirlwind Mine decline cannot be measured directly because it <br />occurs over approximately 100 feet of the decline and within the drifts, collects in the <br />mine sump, and is subsequently pumped into the untreated water tank on the surface. <br />Currently inflow is calculated based on the approximate elevation level of accumulated <br />mine water, which is checked on a monthly basis, and the void volume of the workings. <br />Field parameters were measured and a sample was collected on February 7, 2011. The <br />sample was analyzed for selenium and total radium-226+228 to evaluate the extent of <br />treatment required prior to future discharge. The measured field parameters and <br />analytical concentrations are consistent with historical records. The estimated flow rate <br />shows a significant decrease following a significant increase in the previous quarter. <br />Energy Fuels suspects that this is a result of variability in the estimated void volume of <br />the workings used in the calculations, presence and release of trapped air pockets in the <br />mine workings, or both. <br />The flow rate and field parameters from the Whirlwind Mine water are included in <br />Section 2. Historical analytical data from samples collected from the Whirlwind Mine <br />are summarized in Table 1. <br />Characterization of mine water in the Packrat Mine could not be conducted because the <br />mine is not yet accessible. Section 3 of this report is reserved for field data collected from <br />the Packrat Mine at such time that is becomes accessible and is monitored. <br />DP Spring <br />The flow and field parameters were measured at DP Spring on April 18, 2011. The flow <br />was estimated by determining the time required to fill a 5-gallon bucket. Field