The Obuasi gold deposit, Ghana: A West African giant
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© 2015 Elsevier B.V. The giant Obuasi deposit, Ghana, is the largest gold mine discovered in West Africa with 62 Moz of gold. The deposit is hosted in the Birimian sedimentary rocks of the Kumasi Group, close to the contact with the Ashanti greenstone belt. Two economic styles of mineralization coexist, but were formed during different structural events. The first style consists of sulfide ore, mainly composed of gold-bearing arsenopyrite disseminated in the metasedimentary rocks, and formed during NW-SE shortening (D2<inf>Ob</inf>). The second style consists of high grade visible gold hosted in thick quartz veins up to 11 metres wide. The visible gold distribution is controlled by late fracturing and folding of the quartz veins during NNW-SSE to N-S shortening (D3<inf>Ob</inf>). While the arsenopyrite mineralization is characterized by an extensive ankerite-siderite alteration halo, the alteration footprint of the visible gold ore is only weakly marked by a late generation of chlorite porphyroblasts in the adjacent metasedimentary rocks. Three major styles of oreshoot have been identified: (1) volcanic unit and dyke controlled ore shoots, (2) fault intersection controlled ore shoots, and (3) F3<inf>Ob</inf> fold hinge controlled shoots.
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