Examples of Ore Deposits Magmatic Cu-Ni-PGE-Cr Hydrothermal --- veins --- metasomatic skarns *** magmatic , meteoric, or sea water origin.

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Presentation transcript:

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

Komatiitic basalt Peridotite Gabbro Slate Ore-localizing embayment in footwall gabbro, Zone 3

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 = Example Reactions ZnCl2 + H2S = ZnS(s) + 2H+ + 2Cl- CuCl+ + FeCl2 + 2H2S = CuFeS2(s) + 4H+ + 3Cl- PbCl+ + H2O + ½ S2 = PbS(s) + 2H+ + Cl- + ½ O2