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` ' ~ ~~ 2909 West 7th Avenue • ~-~u ~ <br />P ~, BOx 4036 II I III I II I II IIII III warc~lyde Consultants <br />Denver. Colorado 80204 <br />303-573-7862 ,,,,,, <br />September 22, 1981 ' <br />Climax Molybdenum Company .- <br />Max Schott Building <br />Climax, Colorado 80429 - .. <br />Attention: .Mr. Tom Randolph <br />Re: Geotechnical Services,-Dust Suppressant Study, <br />Climax Molybdenum Company, Climax, Colorado. <br />Job No. 20461-3936 <br />Gentlemen: <br />We have completed our study of products you are considering for use as dust <br />suppressants on the upstream method tailing dams at your Climax Mine, as <br />outlined in ouz letter dated April 23, 1981. We have also included, as <br />requested by your Mr. Randolph on September 25, 1981, permeability test <br />(/~ results obtained using Coherex Dust Retardant as discussed in our report <br />V No. 19762-3936 dated November 26, 1979. The objectives of our study are <br />to provide our opinions on: (a) the effects of the products on tailing <br />sand permeability; (b) pros and cons of each product with respect to mixing <br />requirements, application procedures, s rage, and freeze-thaw stability; <br />(c) relative economics of each product considered; and (d) other potential <br />solutions-to reduce wind erosion of tailing materials. This report presents <br />results of our studies, as well as our opinions and conclusions. Data from <br />our work are summarized on Figures 1 and 2, Tables I through V, and Appen- <br />dices A and B. <br />INTRODUCTION <br />As requested, we contacted the manufacturers and obtained samples of <br />6 selected dust su ressants including: /~~ ARCO Mine Sciences wind <br />Loss Binder 2010, ARCO Mine Sciences ind Loss Binder 2000, <br />(3) NALCO 1DA 55 Mineral and Dust Binder, ~? NALCO 8820 Chemical Bind- <br />ing Agent, (~ Sodium Lignin Sulfonate, and ~ Coherex Dust Retardant. <br />We also obtained material costs, specifications on methods and rates of <br />application, estimated working life, mixing requirements and other perti- <br />nent product information from the manufacturers for this study. You also <br />requested we contact the WEN-DON Corporation and include their product DP-10 <br />in our study. However, they would not respond to our request. Appendix A <br />provides a list of dust suppressant manufacturers we contacted and subse- <br />quently provided samples and information on their product to us for this <br />i/ <br />Consun~ng Engineers. Geo~ogists <br />antl Envuonmernai Sc~enusts , <br />ON~ces in Omer Pnnc~pa~ Gres <br />