Geology of the World’s Major Gold Deposits and Provinces

Chapter 6: The Supergiant, High-Grade, Paleoproterozoic Metasedimentary Rock- and Shear Vein-Hosted Obuasi (Ashanti) Gold Deposit, Ghana, West Africa
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Published:January 01, 2020
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CiteCitation
Nicholas H.S. Oliver, Andrew Allibone, Michael J. Nugus, Carlos Vargas, Richard Jongens, Richard Peattie, Vaughan A. Chamberlain, 2020. "Chapter 6: The Supergiant, High-Grade, Paleoproterozoic Metasedimentary Rock- and Shear Vein-Hosted Obuasi (Ashanti) Gold Deposit, Ghana, West Africa", Geology of the World’s Major Gold Deposits and Provinces, Richard H. Sillitoe, Richard J. Goldfarb, François Robert, Stuart F. Simmons
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Abstract
Obuasi, with a total mineral resource plus past production of 70 Moz, is the largest gold deposit in West Africa, and one of the largest in the world. It is hosted by ~2135 Ma siliciclastic rocks of the Eburnean Kumasi Basin, which were obliquely shortened along an inverted boundary with the older Eoeburnean Ashanti belt to the east. Greenschist facies metamorphism was coeval with mineralization and related alteration at ~2095 Ma. The steeply dipping, ENE-plunging lodes extend over an 8-km strike length and to depths of >2.5 km. They include paragenetically complex gold-rich quartz veins surrounded by refractory auriferous...