Cordilleran Vein Type Deposits Examples
Cordilleran Vein Type Deposits Examples
Cordilleran Vein Type Deposits Examples
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<strong>Vein</strong>s 11/3/10<br />
Ore <strong>Deposits</strong> -‐ Mul>ple Events<br />
• Pb-‐Ag deposits: widely scaiered veins (NE)<br />
– (Pb,Ag)S, tetrahedrite, ± sph, cpy, py<br />
• Fluorite deposits: Jamestown<br />
– 1-‐20’ wide veins, 100-‐1000’ long<br />
– Adjacent to sodic grani>c stocks<br />
– Deep violet color: up to 0.05% U<br />
• Pyri>c Au deposits: NE trending veins<br />
– Coarse pyrite, cpy, sph, gal, tetrahedrite<br />
– Earlier than Au-‐Te event<br />
Mul>ple Events -‐ con>nued<br />
• Au-‐Te deposits: NE trending fissures<br />
– Inches to feet thick, mined to 3-‐700’ depth<br />
– Ore con>nues at depth but water and Au price<br />
made non-‐economic<br />
– Best ore in breccia zones<br />
– Petzite, hessite, sylvanite, calaverite, …<br />
• Tungsten deposits: E-‐NE belt overlapping<br />
end of Te belt<br />
– Fe-‐Mn tungstates (ferberite)<br />
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