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TELEST® <br />{O LUiION{•~IVCf F>_[{~f0 <br /> <br /> <br /> <br /> <br /> <br /> <br />DATE: <br />TO: <br />FROM: <br />SUBJECT: <br />COPY: <br />TECHNICAL <br />January 3, 2004 <br />Bill <br />1601 Prospect Parkway, Suite C <br />Pon coups, cororado sass <br />s~o-asa-noais~o-asa-r~ss fFax~ <br />F~8 M.1ocCa\5 and 6¢0\09~ <br />prv\5{o <br />Telesto # 212100 <br />Analysis of Pre-Mining Ground Water Quality in the Vicinity of the <br />West Pit <br />Madrid <br />INTRODUCTION <br />At the request of Battle Mountain Resources, Ina (BMRI}, Telesto Solutions, Inc. <br />(Telesto) has conducted an evaluation and analysis of current ground water chemistry <br />conditions in the West Pit of the San Luis Mine, Costillo County, Colorado (Figure 1). <br />Based on available water chemistry information, constituent concentrations in ground <br />water of the West Pit are approaching steady-state values after steadily decreasing since <br />implementation of the ground water control program outlined in Technical Revision 26 <br />(TR-26) to permit number M-118-89. Given the West Pit ground water chemistry steady- <br />state condition, a comparison between pre-mining water chemistry and current conditions, <br />as contemplated in TR-26, is warranted. <br />Information drawn upon to complete this analysis includes baseline descriptions and data <br />as presented in the original mine permit application, additional data generated during <br />development of TR-26, and the ground water quality database that has been developed in <br />' conjunction with performance monitoring of the TR-26 ground water control program. <br />This technical memorandum evaluates the pre-mining and post-mining geologic, <br />' hydrologic, and geochemical conditions with the objective of demonstrating that current <br />constituent concentrations in the West Pit backfill are equal to or less than pre-mining <br />conditions. BMRI and Telesto acknowledge that the ground water level control in the <br />' West Pii should be maintained to continue the current ground water chemistry conditions <br />1 <br />J <br />r~N ianziz.,,e~~.n„,nm,m;..nloRmn'v.-zs~~ngrn'r•P~Fr,,. ~~~P, peda <br />j <br />