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Ct&U GOLD MNG. CO. ID:719-68?-3254 FEB 03'B4 817 No .003 P.02 <br />~~ • 10,000 ppm <br /> 1,000 pprn <br />a <br />z 100 ppm <br /> <br />C~ 10 ppm <br />+ 1 ppm <br />N <br /> 100 ppb <br />10 ppb <br />®Porphyry Ivlolybdsnum <br />^ IpneOUa pOlymetalllC <br />® Gold-tetludda <br />• ^ Aeld-sulfate eplthettnttl <br />® Attularla•apriclts epltherrnal <br />Cetdral CRy-typo <br />polymetelllc valns <br />• <br />7 8 9 <br />^ Hlph•sulflde caroonrte• <br />hosted <br />~ Low-sultlda cetbonate• <br />hwtod <br />rigure 2. Variations in aqueous base metal conxntradons (given az the sum of base metals <br />7n, Cn, Cd, ]?b, Co, and Ni) es a function of pH for waters draining diverse oro deposit types <br />in Colorado. A classification scheme bazcd on pH and sum of brio metals was proposed by <br />Ficklin et aL (1992) based on the first year s sampling carried out in this study. The classes <br />are labeled by bold text and ate bounded by heavy lines. Sample locations and doposirtypes <br />are given In Figure 1 and Table 2. <br />Iron Mountain, the oro is composed of lenses of massive pyrite with other base metal sulfides. <br />The exhsme acidities result from the oxidation of sulfides in these lenses and the lack of contact <br />of the waters with surrounding nutnvolcanic host rocks, which are theattelves relatively low in <br />acid-buffering capacity (Alpers and Nordstrom, 1991). Although the waters drain <br />underground workings, heat given off Burins sulfide oxidation leads to high ambient <br />temperatures and extensive evaporation of the waars (Alpets and Nordstrom. 1991). <br />High-acid, <br />Extreme- <br />~ metal <br />8fadt- Dike 2 <br />strap ~ ~ <br />Acid, <br />Extreme-metal <br /> <br />aeynoms <br />Lonq <br /> <br />Near•neutrel, <br />Extreme-metal <br /> <br />~ FG <br /> <br />Argo IdahoB <br />~ Raw Near-neutral, <br />0 <br />k <br /> enn <br />®Idaho <br />Acid, Sol : <br />Htgh-metal <br />MCN1,2 Hl~h•metal Ban® <br />Hlgh•ecid, ®ql Am <br />High-metal O Gar ^ LD <br /> Bon Gama ^ Par1 <br />PMB ^ NS ~Chep3 Rub <br /> SMCB Par up Qti <br />~ O <br />O <br /> M <br />Q WP <br />a <br />O <br />^ r® <br />Highatid, Acid, hap2~Hur <br />G <br />Low-metal Low-metal Near-neutral, Dau <br /> Low-metal ~ Swa <br />1 2 3 4 3 6 <br />pH <br />High acid-high metal, and acid-high metal <br />Waters in these nvo classes are of two main types. The fiat type, typified by the Argo, <br />Yak, and Solomon mines, drain a variety of sulfide-rich deposit types that have low to <br />moderate acid-buffering capabilities in their ore or wallrocks. These waters carry high <br />coneeaaations of base metals (ptrdominandy Zn), but generally do rat carry significant <br />concentrations of exotic metals such as REE. Most of these waters hove high dissolved <br />oxygen (DO) indicative of continued atmospheric contact However, the waters do not have <br />