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ice- - ~ III IIIIIIIIIIIII III ~ <br />BATTLE MOUNTAIN GOLD COMPANY <br />January 25, 1993 <br />RECE~L'~ ~ <br />Mr. Larry Oehler JAN 2 91993 ~.~ <br />Division of Minerals and Geology D1Vj` _ asrnEMOUNwN <br />1313 Sherman Street, Room 215 MIMERq~$ ~, 4 ` GOLD COMPANY <br />Denver, Colorado 80203 <br />Re: Battle Mountain Resources, Inc. (BMRI) - San Luis <br />DMG Permit No. M-88-112 <br />Dear Mr. Oehler: /~ <br />The following is a summary of the water sampling activities ~ <br />and lab analysis reports where detectable cadmium <br />concentrations were noted. <br />As outlined in section 4.2.5 Pre-Detox and Post-Detox <br />Sampling and section 4.2.6 Tailings and Collection Pond <br />Sampling of the Quality Assurance/Quality Control Protocol <br />Manual, TR-006, each process point water sample is tested <br />for the presence of sulfides with lead acetate paper. If <br />the sulfide test is positive, cadmium nitrate is used as a <br />pre-treatment before field filtering the sample. Phe <br />purpose of this procedure is to eliminate sulfide <br />interference with the cyanide analysis. This methodology is <br />outlined in "Methods for Chemical Analysis of Water and <br />Waste," EPA-600\4-79-020. <br />Lead acetate testing of the water samples has never <br />indicated a positive sulfide result. However, cadmium <br />nitrate was first used as a pre-treatment during the May 28, <br />1992 bi-weekly sampling event and use continued through the <br />November 11, 1992 bi-weekly. Process point samples were <br />pre-treated by adding cadmium nitrate crystals to the water <br />sample, then a barrel filter was used to field filter the <br />sample. The samples were treated with cadmium nitrate even <br />though the sulfide testing with lead acetate paper was <br />ne;a±i..e to ensure that all po*ential- sulfide interference <br />was eliminated. <br />A detectable cadmium concentration was first reported by <br />Core Laboratories on a sample collected on June 10, 1992 at <br />well M-9. A chronological listing by monitoring location of <br />samples with detectable cadmium concentrations is attached. <br />The sample dates marked with an asterisk indicate samples <br />that were collected directly after a process point or <br />directly after a sample where dissolved cadmium was <br />detected. The dissolved metals sample for surface water and <br />ground water is field filtered using the same barrel filter <br />as used during the pre-treatment of process point samples. <br />PO. BOX 310 SAS' LUIS, COLORADO 61152-0310 (719) 672-3362 FAX (7191672-3363 <br />