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Summary of Quarterly Hydrological Monitoring <br />Monitoring Activities <br />The following field monitoring and sampling activities were performed during the <br />Second Quarter 2011 (April through June 2011): <br />• May 24, 2011 — Monitoring well W -1 was measured for flow rate and field <br />parameters and sampled. A seep survey was conducted. DP Spring and PR <br />Spring were measured for flow rate and field parameters and PR Spring sampled. <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 />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 />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 on June 20, 2011. The measured field parameters are <br />consistent with historical records. The estimated flow rate shows a significant decrease <br />in the First and Second Quarter 2011 following a significant increase in the Fourth <br />Quarter 2010. Energy Fuels suspects that this is a result of variability in the estimated <br />void volume of the workings used in the calculations, presence and release of trapped air <br />pockets in the 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 May 24, 2011. The flow <br />was estimated by determining the time required to fill a 5- gallon bucket. Field <br />parameters from DP Spring were measured in the stock tank located at the spring. The <br />flow rate and field parameters at DP Spring are consistent with historical records with the <br />exception of oxidation - reduction potential which measured somewhat lower than <br />historical measurements. <br />1 <br />