Laserfiche WebLink
<br />PREDICTED TAILINGS GEOCHEMISTRY <br />During laboratory-scale treatability studies, samples of INCO SO,/Air treated tailings were cdlected <br />and analyzed. The purpose of the testing program was to evaluate whether the INCO SOz/Air <br />process would change the geochemical nature of the tailings over that currently permitted. Tests <br />performed incuded static acid generation potential/acid neutralization potential (AGP/ANP), <br />leachability using U.S. Environmental Protection Agency (EPA) Method 1312, and humidity cell tests. <br />Static AGP/ANP data for the INCO S0,/Air detoxified tailings are Included In Table 2. Also included <br />in Table 2 are data for two tailings samples analyzed In 1989 using similar methods. Samples tested <br />in 1989 consisted dcarbon-IMeach type tailings. The samples were generated by Battle Mountain <br />Resources, during bench-scale leaching tests (Steffen Robertson and Klrsten, 1990b). <br />TABLE 2 <br />COMPARISON OF INCO SO,/AIR TREATED TAILJNGS <br />AND UNTREATED CARBON-IN-LEACH TAILINGS <br />Parameter INCO/SO, <br />Treated Tailings' CIL Tailings' CIL Tailings' <br />Total Sulfur (%) 1.28 2.82 2.79 <br />Pyritic Sulfur (%) 1.02 1.73 1.56 <br />Sulfate Sulfur (%) 0.29 0.02 <0.01 <br />AGP' [Total Sulfur] 40.0 88.1 87.2 <br />AGP' [Pyritic Sulfur] 31.9 54.0 48.9 <br />ANP' 6.3 1.8 7.6 <br />Core Laboratories, Inc., 1992a. <br />Core Laboratories, Inc., 1989. This laboratory report was included as <br />Attachment 1 in the San Luis Project Permit Amendment Adequacy Responses, <br />dated January 9, 1990 (Steffen Robertson and Kirsten, 1990b. <br />AGP =acid generation potential, tons CaCO,/1,000 ton material. <br />ANP =acid neutralization potential, tons CaCO,/1,1X)0 ton material. <br />As shown in Table 2, tailings samples detoxified using the INCO SOZ/Air process have similar AGP <br />and ANP values to those tested In 1989. The data suggest that the INCO SOz/Alr process will not <br />25301/RN0610.RPT INCO SOZ/Air Technical Revision Page 9 <br />June te, 1992 Sen Luis Mine <br />