Examples of Ore Deposits
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Transcript of Examples of Ore Deposits
Examples of Ore Deposits
• Magmatic Cu-Ni-PGE-Cr• Hydrothermal --- veins --- metasomatic skarns *** magmatic , meteoric, or sea water origin• Low-Temperature --- Banded Iron Formations --- Residual weathering/ supergene enrichment
Ore-localizing embayment in footwall gabbro, Zone 3
Peridotite
Gabbro
Komatiitic basalt
Slate
Nickel plate Electrowinning cathode
Uses of platinum
Pt wire Pt mesh
Mechanisms of Mineral Precipitation
• Temperature decline• Pressure change• Dilution• Change in oxidation state (e.g. Eh)• Change in pH• Change in parameters like cation
concentration or volatile pressure
ZnCl2 + H2S = ZnS(s) + 2H+ + 2Cl-
CuCl+ + FeCl2 + 2H2S =
CuFeS2(s) + 4H+ + 3Cl-
PbCl+ + H2O + ½ S2 = PbS(s) + 2H+ +
Cl- + ½ O2
Example Reactions