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i <br />TECHNICAL MEMORANDUM <br />DATE: 26 September, 1996 <br />TO: Dan Robertson, Sally Hayes Kaiser (IIMRp <br />FROM: Mark J. Logsdon (Geochimica) <br />SUBJECT: EVALUATION OF GEOCHEMICAL TESTING OE <br />ADDITIONAL,~DI;EY SAMPLES FROM LOWER <br />TAILINGS IMPOUNDMENT -SAN LUIS <br />cc: A. 11a(drige, S. Rrotvn (BMGC) <br />BACKGROUND <br />In Apri] I992, the Colorado Division of Mines and Geology (DIvIG) issued a Notice of <br />Violation to Battle Mountain Resources, Inc. (BMRI) related to Reclamation ;Permit <br />No. M-88-112. Abatement 8 required BMRI to conduct investigations to deuttmine if <br />constituents in railings materials differ from materials that were characterized prior to <br />operations. <br />In May, 1993, BIv1RI submitted a report addressing the Abatement 8 issues (and also <br />issues related to Abatement 10). Subsequently (October, 1993), BMRl prepared a <br />response to DMG and citizen comments on the May report. In the October, 1993 <br />response document, BMRI undertook to collect and analyze five additional, decp <br />samples from the Iower impoundment. The flue Samples, collected from three borings <br />in the Iower impoundment, are as follows: <br />1. Drill Hole #14, ]5" - 26.5' BCS <br />2. Drill IIolc #l5, 35'-45' BGS <br />3. Drill Hole #15, 45'-55' BGS <br />4. Drill Hole q16. 35' - 45' BGS <br />5. Drill Hole # 16, 45'-55' BGS <br />The five additional satnpJcs were collected to test the hypotheses that the pore water is <br />relatively homogenous and that the geochetnical conditions of the deeper portions of the <br />Lower Impoundment are sufficiently similar to the characteristics identified tin pre- <br />operational testing that no new cond~[ions need to be applied b}~ DMG. <br />BMRI provided test data for the additional samples and copies of the 1993 EMRI <br />reports to Geochunica, Inc. (Denver, Colorado) for evaluation. This memorandum (a) <br />documents the results of the testing conducted on samples collected to fulfill $MRI's <br />Geochimica, lnc. 1 ?ti September, 1996 <br />