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Pikwe, Phikwe, Selebi

Botswana

Main commodities: Ni Cu
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The Pikwe - Selebi (or Selebi - Phikwe) copper-nickel deposits are located in eastern Botswana, 400 km NNE of Gabarone.

They comprises three folded tabular orebodies which lie within the Central Zone of the Limpopo Mobile Belt. Ore is hosted by mafic and ultramafic rocks concordantly developed within a thick Archaean sequence of biotite, hornblende and feldspar gneisses, with intercalated anorthositic gneisses, talc-tremolite quartzites and pure quartzite.

The three orebodies are spread over a 15 km interval and apparently lie on a single continuous mineralised mafic band. The ore bearing band is from 0 to 45 m thick and comprises an amphibolite hosting mineralisation ranging from disseminated (0 to 40%) to semi-massive (40 to 70%) and massive (70 to 95%) pyrrhotite with associated pentlandite and chalcopyrite.   The sulphides and the ore have been strogly deformed, remobilised and recrystallised.

Reserves remaining in 1985 were 74 Mt @ 1% Cu, 0.75% Ni, after a startup in 1973 and production rate of 3 Mtpa.

For detail consult the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 1990.    
This description is a summary from published sources, the chief of which are listed below.
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  References & Additional Information
   Selected References:
Fiorentini M L, Bekker A, Rouxel O, Wing B A, Maier W and Rumble D,  2012 - Multiple Sulfur and Iron Isotope Composition of Magmatic Ni-Cu-(PGE) Sulfide Mineralization from Eastern Botswana: in    Econ. Geol.   v.107 pp. 105-116
Gallon M L  1986 - Structural re-interpretation of the Selebi-Phikwe nickel-copper sulphide deposits, Eastern Botswana: in Anhaeusser C R, Maske S, (Eds.), 1986 Mineral Deposits of South Africa Geol. Soc. South Africa, Johannesburg   v2 pp1663-1669
Maier W D , Barnes S-J, Chinyepi G, Barton J M, Eglington B and Setshedi I,  2008 - The composition of magmatic Ni-Cu-(PGE) sulfide deposits in the Tati and Selebi-Phikwe belts of eastern Botswana: in    Mineralium Deposita   v43 pp 37-60


Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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