The Uis pegmatites: morphology, mineralisation and distribution, with an emphasis on the V1 and V2 intrusions

Marais, Timothy
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The Damara Orogen represents a typical Wilson Cycle initiating with extension through and culmination in a collisional environment. The geological units comprise a significant Pan‐African age succession of metasedimentary and metavolcanic lithologies with various associated granitic and granodioritic magmatic bodies. The pegmatites of the Damara belt, the trending branch of the Damara Orogen, represent the final phase of orogeny and magmatism, with mineralised pegmatites (Sn, Ta, Nb, Li, Be and W) exclusively forming in a post‐tectonic environment. The Cape Cross‐Uis pegmatite belt lies within the Northern Zone of the Damara Belt and runs northeast form Cape Cross to Uis. This belt is known to contain granitic pegmatites commonly enriched in Sn, Ta, Nb, Li and Be and contains 3 distinct pegmatite swarms, the Strathmore, Karlowa and Uis swarm. Each of the pegmatite swarms predominantly contain a pegmatite type with the Uis swarm primarily comprising Sn‐Ta‐Nb type pegmatites. The Uis swarm covers and area of approximately 650km2, AfriTin Mining owns a Mining License within this area which includes the historic Uis Tin Mine. An excess of 180 pegmatites were delineated proximal to the historic Uis mine, of these proximal pegmatites nine have been documented in detail. Additionally, ten of the existing excavations within the mine area have been mapped and described in detail.
A research report submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in partial fulfilment of the requirements for the degree of Master of Science. February 2019
Marais, Timothy. (2019). The Uis pegmatites :morphology, mineralisation and distribution, with an emphasis on the V1 and V2 intrusions. University of the Witwatersrand,