REP12513 - Laserfiche WebLink

Home Browse Search

9 3.2 TOTAL VS. DISSOLVED CONCENTRATIONS IN PROCESS POIDYT SAMPLES In this and the previous third-party sampling trip both filtered and unfiltered samples were collected at the process point locations and analyzed to determine (1) if there were significant differences between total and dissolved metal concentrations, and (2) if filtered and total cyanide concentrations differed significantly. Differences in concentrations between 5ltered and unfiltered samples were discussed in the previous section, and major results for this sampling will be highlighted here. For total ryanide, both the upper and the lower tailings pond had higher concentrations in filtered samples. These two process point locations also had higher WAD cyanide concentrations in filtered samples. These results indicate that there may be a negative analytical interferant in the unfiltered samples. For the collection pond, unfiltered samples had higher WAD and total ryanide concentrations than filtered samples. Colloidal iron and zinc appear to be present in all process point samples, and colloidal copper may be precipitating in the collection pond. Colloidal calcium also iappears to be present in the lower tailings pond and the collection pond, most likely as gypsum. These precipitates may interfere with ryanide determinations and adversely affect ry~nide recovery rates. 33 QUALITY CONTROL ANALYSES AND RESULTS The Quality Control Report is included as Appendix D of this summary report. In some cases Core Laboratories used samples from the second third-party monitoring trip to perform spike and duplicate QA/QC analyses. These samples are marked by an asterisk in Appendix D, and the identity of the sample (e.g., Coll. Pond (unfilt)) is also noted. All spike and duplicate analyses involving samples from the second third-party monitbring met the required quality control criteria in TR-006. In several cases, the report printing is repeated (see Appendix D, margins); therefore, it looks as if more QA/QC analyses were conducted with Battle Mountain Gold~samples than actually were. The following samples from the third-party monitoring trip were used for cyanide QA/QC s e analyses: field blank (total cyanide); unfiltered upper tailings pond (total ryanide); unfiltered M-13 (WAD cyanide); unfiltered M-9 (WAD cyanide), and unfiltered RS-5 (WAD ryanide). The following samples were used for ryanide QAjQC plicate analyses: unfiltered M-9 (total ryanide); duplicate unfiltered M-13 (WAD ryanide); unfiltered lower tailings pond (WAD cyanide), and unfiltered RS-S (WAD cyanide). The only process point samples used for QA/QC analyses were unfiltered Upper tailings pond (for total cyanide spike analysis), and unfiltered lower tailings pond (for WAD cyanide duplicate analysis). The important QA/QC analyses for this project are the total and WAD RCG/Hagler, Bailty, Inc.