Cordilleran Vein Type Deposits Examples

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Veins 11/3/10 14
Veins 11/3/10 Ore Deposits -‐ Mul>ple Events • Pb-‐Ag deposits: widely scaiered veins (NE) – (Pb,Ag)S, tetrahedrite, ± sph, cpy, py • Fluorite deposits: Jamestown – 1-‐20’ wide veins, 100-‐1000’ long – Adjacent to sodic grani>c stocks – Deep violet color: up to 0.05% U • Pyri>c Au deposits: NE trending veins – Coarse pyrite, cpy, sph, gal, tetrahedrite – Earlier than Au-‐Te event Mul>ple Events -‐ con>nued • Au-‐Te deposits: NE trending fissures – Inches to feet thick, mined to 3-‐700’ depth – Ore con>nues at depth but water and Au price made non-‐economic – Best ore in breccia zones – Petzite, hessite, sylvanite, calaverite, … • Tungsten deposits: E-‐NE belt overlapping end of Te belt – Fe-‐Mn tungstates (ferberite) 15
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Page 3 and 4: Veins 11/3/10 Casapalca, Peru 3
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Page 11 and 12: Veins 11/3/10 Cerro de Pasco, Peru
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Page 17 and 18: Veins 11/3/10 Coeur D’Alene, Idah
Page 19 and 20: Veins 11/3/10 Faul>ng • WNW fault
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Page 23: Veins 11/3/10 Cobalt, Ontario -

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