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Onverwacht Mine, Lydenburg District, Eastern Bushveld Complex, Mpumalanga Province, South Africa

Ref.: Cabri, L.J., Rosenzweig, A., and Pinch, W.W. (1977) Platinum-group minerals from Onverwacht. I. Pt-Fe-Cu-Ni alloys. Canadian Mineralogist: 15: 380-384.

Cabri, L.J., Feather, C.E., and Stewart, J.M. (1977) Platinum-group minerals from Onverwacht. II. Platarsite, a new sulfarsenide of platinum. Canadian Mineralogist: 15: 385-388.

Cabri, L.J., Stewart, J.M., Laflamme, J.H.G., and Szymanski, J.T. (1977) Platinum-group minerals from Onverwacht. III. Genkinite, (Pt,Pd)4Sb3, a new mineral. Canadian Mineralogist: 15: 389-392.

Zaccarini, F., Garuti, G., and Cawthorn, R.G. (2002) Platinum-group minerals in chromitite xenoliths from the Onverwacht and Tweefontein ultramafic pipes, eastern Bushveld Complex. Canadian Mineralogist: 40: 481-497.

A PGE mine in a hortonolite-dunite body. Now closed. Workings were at least to the 250 foot/meter (?) level.

Platiniferous magnesian dunite subvertical cylindrical pipe crosscutting the layered cumulates of the Bushveld complex (Lower Critical Zone).
Existence of magmatic replacement.
Magnesian dunite rimmed by harzburgite gradational intopyroxenitic wallrock (layered norites and anorthosites).
Core zone : Hortonolite dunite and wehrlite pegmatites.





Mineral List:
Bornite
Braggite
Chromite
Cooperite
Forsterite
Genkinite (TL)
Geversite
Hedenbergite
'Hornblende'
Ilmenite
Irarsite (TL)
Iridium
var: Osmiridium

Magnetite
var: Titaniferous Magnetite

Mertieite-II
Phlogopite
Platarsite (TL)
Platinum
var: Ferroan Platinum

Ruthenarsenite
Sperrylite
Spinel
var: Chromspinel

Stibiopalladinite
Tetraferroplatinum
Valleriite


23 entries listed. 18 valid minerals. 3 type localities (valid minerals).

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