Gevers and Frommurze (1929) demonstrated that the most important tin deposits of central Namibia are confined to three distinct, approximately parallel, belts within the NE trending Damara Orogen, viz. - a) the Northern Tin Belt, extending from the important Uis tin mine southwards towards the Strathmore tin pegmatites area near Cape Cross, a distance of some 80 km; b) the Central Tin Belt, extending from the northern bank of the Omaruru River in the Nainais and Tsomtsaub area, 100 km east towards the Tjirundu Mountains, north of Omaruru; c) the Southern Tin Belt, aligned along a tectonic feature, the Spitzkoppe in the south-west, to Otjimbajo in the north-east - a distance of some 120 km. The pegmatite bodies in the tin-belts are conformable to the structures in the Damara Sequence and are commonly banded, with the different portions being separated by a thin band of schist. The pegmatite bodies are generally 1-2 m wide but may bulge in places to form extensive, zoned bodies with quartz cores. A characteristic feature of pegmatite bodies in the tinbelts is that they crop out as wall-like features rising sharply from the easy-weathering schistose country rocks. The pegmatites generally exhibit a relatively simple composition, with some marginal enrichment of muscovite and tourmaline.