REP23192 - Laserfiche WebLink

Home Browse Search

" ~ i i ' ~ u i i~iiiiiu~iiii BATTLE MOUNTAIN GOLD COMPANY ( '~ ~ February 9, 1993 FFe j ~ 1g9;r Mr. Larry Oehler 4I~~~c,;"- ; J~~~, Division of Minerals and Geology •~= d ~_ 1313 Sherman Street, Room 215 GOLD COM ~Y Denver, Colorado 80203 ,• /, Re: Battle Mountain Resources, Inc. (BMRI) - San Luis j ~(, •~` DMG Permit No. M-88-112 '~ ~~ ~' Bi-Weekly Water Sample Report - December 9-11, 1992 Dear Mr. Oehler: Enclosed are the analytical reports from Core Laboratories for the bi-weekly water samples collected on December 9-11, 1992 as specified in the April 1992 Abatement Plan. The cYoss- reference table between sample identification numbers and sample locations is attached. No deviations from the sampling QA/QC protocols, TR-006, were noted for any of the samples collected. Wells M-9 and M-13, RS-5, and the five process points were sampled. Well M-12 was not sampled as the portable generator to power the sampling pump malfunctioned. wells M-2, M-6, M- 7, and M-8 and the three lysimeter pairs were checked and found to be dry. A barrel filter rinse blank and a field blank were taken as field quality control samples. A dissolved cadmium concentration of 0.015 ppm was reported by Core Labs in the sample collected at RS-5. The total cadmium analysis for RS-5 was reported as non-detectable. The dissolved value being greater than the total value indicates contamination of the dissolved sample. The detected dissolved cadmium concentration appears to be from residual cadmium nitrate in the barrel filter. Cadmium nitrate was used as a pre-treatment during earlier sampling events to eliminate sulfide interference in samples being analyzed for cyanide concentrations. we are looking into cleaning procedures to remove any residual cadmium nitrate from the barrel filter. We are also investigating alternative filtering devices. This paragraph serves as a follow-up to our telephone conversation of February 5, 1993, concerning the results reported by Core Laboratories on the December 10, 1992 post- detox sample. Core Labs reported cyanide values of 12,.6 ppm CN-wad and 22.7 ppm CN-total. As specified in TR-006, free and weak acid dissociable cyanide values were calculated for the five process point samples. The calculated cyanide value range for this sample is 1.53-2.21 ppm CN-wad and 1.61-2.29 ppm CN-total. The calculations are based on methods outlined in the May 1992 cyanide chemistry report by hydro-geochemist, P.O. BOX 310 SAN LUiS, COLORADO 81152-0310 (719) 672-3362 FAX (719) 672-3363