8. 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

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

15. Nickel plate
Electrowinning cathode

16. Uses of platinum

17. Pt wire Pt mesh

37. 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

38. 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