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Location: 30 km E from Harare, Zimbabwe
ArcturusZimbabwe
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Arcturus is situated (in the Enterprise belt) in the southern limb of the Harare Greenstone Belt. Orebodies generally comprise individual lenses which range from 0.2 m to 5.0 m in width and dip from 55° to 70°.The Arcturus gold mine, located within the Shamvaian Group, is hosted in the Iron Mask Formation, which comprises a succession of metamorphosed felsic volcanics and associated metasediments including prominent bands of sulphide-facies iron formation, phyllites, meta-arenites, and quartzose schists (Oberthur et al., 2000). The mineralized shear zones in the Arcturus mine are characterized by silicification, biotite, and K-feldspar alteration. Gold mineralization is associated with pyrrhotite, arsenopyrite, and also occurs as free gold, which contributed up to 10% of production.There are 6 major reefs at Arcturus: Venus, Arcturus, West, Slate, Saturn, Planet.Venus. - Ore bodies are irregularly – shaped, discontinuous and lenticular. - Reefs comprise well banded to laminated siliceous lithologies that consist of millimetre to centimetre units of pink-brown, cherty layers of k-feldspar-quartz-biotite-arsenopyrite which alternate with amphibole – diopside – epidote – plagioclase units containing pyrrhotite and pyrite. - Pyrrhotite and arsenopyrite are the dominant sulphides. - Free gold is rare.- The reefs are arranged in an en echelon array in the alteration zone. - The ore bodies trend south-easterly and dip at 55 - 70 degrees to the north-east.- The payshoots show variable pitch towards the west. - Ore body widths vary from less than a metre to 30 metres.Venus – Dolerite Dyke.* The dolerite dyke (25 – 40m thick) dipping 60 degrees SW exists around 2 – 3 level.* Ore bodies above the dyke were mined from surface.* The intrusion of the dyke resulted in a reverse movement which subsequently resulted in a vertical displacement of 80 – 90m.
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