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TECHNICAL MEMORANDUM <br />To: Bill Lyle <br />Date: January 3, 2004 <br />Page l l <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />L~ <br /> <br /> <br /> <br />Table 3 Results of Statistical t-test Analysis of Pre-Mining and Current Ground <br />Water Quality <br /> Pre-Mine Backfill p-value <br />TDS <0.0001 <br /> Mean 1131.67 485.56 <br /> Standazd Deviation 109.IZ 107.22 <br /> N 12 70 <br />F 0.2056 <br /> Mean 3.717 4.14 <br /> Standard Deviation 0.873 1.067 <br /> N 12 60 <br />SOa <0.0001 <br /> Mean 523.01 185.17 <br /> Standard Deviation 104.59 68.44 <br /> N 13 70 <br />Mn <0.0001 <br /> Mean 5.621 2.879 <br /> Standard Deviation 1.560 2.176 <br /> N 14 70 <br />Fe <0.0001 <br /> Mean 3.642 1.139 <br /> Standazd Deviation 1.578 2.052 <br /> N 14 70 <br />CONCLUSIONS <br />Telesto has conducted this analysis comparing current hydrologic and geochemical <br />conditions in the West Pit with pre-mining conditions. Evaluation of the geology, <br />hydrology and geochemistry support the following conclusions: <br />' • Pre- and post-mining hydrologic flows from the bedrock aquifer are similar in that <br />the principal location of discharge from the bedrock aquifer is the shallow zone <br />with some contribution from deeper, confined portions of the bedrock aquifer. <br />Additionally, the same magnitude of hydrologic flow exists now as did prior to <br />mining. <br />' • Pre- and post-mining hydrologic flows differ in that prior to mining, ground water <br />discharged by leakage through the confining fault gouge clay layer, under <br />conditions of direct contact between the bedrock and Rito Seco alluvium (on the <br />r: y...qPO~.nz,z-,.~~,.,.~.,rcwm;rlU~„ru;.w_zx.-,.a,n'n.P,n;.,. ~~~P.,m+'r.~: <br />1 <br />