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~/1/~ Western Atlas International -. ~, anu c..-m , CORE LABORATORIES Sample Delivery Group Narrative Customer: Battle Mountain Gold Project: San Luis Mine Core Labs Project Numbers: 930214/930263 (reanalysis: 930406) On February 9th and 19th, 1993, Core Laboratories-Aurgra received sample sets from Battle Mountain Gold's San Luis Mine that were to be analyzed for a variety of inorganic parameters and radionuclides. The samples were collected by a representative of Battle Mountain Gold on 02/03 and 02/18. On March 16, 1993, Alana Scott of Battle Mountain Gold requested that Core Labs investigate results for total cyanide and Weak Acid Dissociable (WAD) cyanide generated on several of the samples. It was decided to perform reanalyses of these particular samples and the results are attached (Core Job Number 930406). The following information is pertinent to the interpretation of these data packages. The results of the reanalyses for total and WAD cyanide are in many cases significantly different than the results obtained during the original analyses of these samples. It should be noted that all reanalyses were performed past the published holding times for these parameters. Although WAD cyanide results theoretically should not be greater than total Cyanide results this situation existed for several of the original analyses. In all cases except one this situation did not exist with results of the reanalyses. The raw data for both the original analyses and reanalyses was thoroughly reviewed and all quality control associated c•~ith both sets of data met requirementes. Core Labs is unable to adequately explain the anomoly associated with these results at this time. David A. Mc~aharter Laboratory Manager = ~ ~ e _:; ~x ~ .r ,~ ~ osP , ~.o .,. --- : r,. , ~ : ~ P a .. < ,,. , .~_,. ~ •: ~- ~ _~ _ ~~s.~_, .~ o, , _ V , , ~: ~~? , , ,.~; , ;, ~ .:~. _~: ,~~.~ <. ,. y i • ,_s .~ ,