CU, AU, AND ZN-PB SKARN DEPOSITS (MODELS 18b,c; Cox and ...
CU, AU, AND ZN-PB SKARN DEPOSITS (MODELS 18b,c; Cox and ...
CU, AU, AND ZN-PB SKARN DEPOSITS (MODELS 18b,c; Cox and ...
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Figure 5. Plots showing A, relationships between pH <strong>and</strong> iron abundances; B, pH <strong>and</strong> aluminum abundances; C, specific conductance <strong>and</strong> pH;<br />
<strong>and</strong> D, between sulfate abundances <strong>and</strong> specific conductance for ground (squares) <strong>and</strong> surface (circles) water in the New World district, Mont.<br />
Water data from SCS Engineers (1984). Ground water chemistry for Middle Cambrian Meagher Limestone (at Ennis, about 130 km northnorthwest<br />
of the New World district) reported by White <strong>and</strong> others (1963, table 6) is shown for reference (open square). The Meagher Limestone<br />
is the most important host rock for skarn deposits in the New World district (Johnson, 1991).<br />
is commonly present in skarn deposits, waste rock may include less reactive gangue minerals, including silicate<br />
minerals, <strong>and</strong> tailings may have highly variable acid-buffering capacity. Andrews (1975) reports typical abundances<br />
for a number of metals, including 6 to 38 ppm lead, 10 to 65 ppm zinc, <strong>and</strong> 1 to 35 ppm copper, in tailings<br />
associated with a number of deposit types.<br />
Metals released from weathered primary (hypogene sulfide ore) <strong>and</strong> secondary (supergene oxide <strong>and</strong> sulfide)<br />
minerals in tailings at the Kelley zinc-lead skarn deposit in the Magdalena, New Mex., district are fixed by<br />
precipitation of tertiary minerals <strong>and</strong> by ion exchange into phyllosilicate minerals on grain surfaces <strong>and</strong> along<br />
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