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Review of Abatement ~`8 Response August 4, 1993 Page 6 Does acid pH used in Zeachate test cause cyanide to go into gaseous form and, if so, is this gas captured and measured as part of the testing procedure? I suggest that the reviewers know that the answer to this question is "no." However, given the conditions under which the tailing will reside after closure, the conditions under which cyanide is used ~n countless operations elsewhere in the world, and the conditions th t one could logically presume will prevail at the site following closure, it is reasonable to me to assume that cyanide which may volatalizei at the site upon closure will not be problem. If it were likely to be problem at the San Luis facility, it would already have been a problem at numerous facilities elsewhere around the world where cyanide fie trans fitted to the air during operations. Pages 34-35: Was only one sample measured for pore water? Yes. See my comments above. 10. Is BMG planning to use the tailings pond as a part of a fut~re landfill site? The facility is permitted to reclaim to a poet mining 1 nd use for rangeland. The Division of Minerals and Geology does n permit or regulate the siting or operation of landfills. Provided Hat le Mountain submits an amendment or a revision to the permit to change th poet-mining land use, the Division will consider the amendment. To my k owledge, no such amendment or revision has been submitted. The final paragraphs of the PASS comments and concerns go well bey nd the scope of the response to Abatement ~8 in some cases, request board actin in others, prevail upon the Division to enforce and regulate in affairs over wh ch they have no jurisdiction in some cases, and call up references to reports a d documents and statements about which I am not familiar. I certainly and retand that community members may be concerned about the safety and operations f facilities such ae mines that are near their communities, and I eympathiz with those concerns. I am not in a position to evaluate each of the final eta emente, and suggest that the lead specialist deal with each of these. However, there are a few statements which I can address. First, the pond composition has, in the Division's opinion, beef adeauately characterized and its contents are being monitored through adequat~ means. In general, the chemical stratification which we originally anticip ted has not proven to be the case. Second, I am aware of no reagents or chemic is added to the process solutions that would cause the liner to deteriorate. I the parties know of or suspect any such chemicals, they should inform the Divi~ion so that we can make a determination.