Abstract

The upper part of the Precambrian Dolomite Series is mineralized with fluorite and minor lead-zinc. The deposits show similarities to the Mississippi Valley type but were subsequently metamorphosed in the contact aureole of the Bushveld Igneous Complex. The ore locations are mostly controlled by paleoporosity of the dolomite such as vuggy horizons and paleokarst. On a larger scale the fluorite district is localized on a paleorelief which acted as an ore trap. Several genetic hypotheses are proposed; the most attractive one is precipitation from solutions which derived fluorine from the Dolomite Series and/or Pretoria Series during diagenesis. Economically the fluorite district appears to be one of the largest in the world.

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