Geologic map of the Tarkwa gold district in Ghana showing significant folding and faulting of the BirimianGeologic map of Birimian outcrops in Mali, at Bougouni and Kenieba
The Birimian rocks are major sources of gold and diamonds that extend through Ghana, Côte d'Ivoire, Guinea, Mali and Burkina Faso. They are named after the Birim River, one of the main tributaries of the Pra River in Ghana and the country's most important diamond-producing area. Ghana and Mali are the second and third largest producers of gold in Africa, respectively.[1]
The Birimian terranes in the southern part of the West African craton are a mix of metamorphosed volcanic, sedimentary, and plutonic rocks and low-grade metavolcanics and metasediments. Almost half of the terranes consist of alkaline granites. The rocks formed over a period of about 50 million years between 2.200 Ga and 2.100 Ga years ago.[2]
^"Africa geologically under-exposed". Mining Review Africa. 2004. Archived from the original on December 2, 2008. Retrieved 2009-03-16.
^Muriel Boher; Wafa Abouchami; Annie Michard; Francis Albarede; Nicholas T. Arndt. "Crustal Growth in West Africa at 2.1 Ga". American Geophysical Union. Retrieved 2009-03-16.
The Birimian rocks are major sources of gold and diamonds that extend through Ghana, Côte d'Ivoire, Guinea, Mali and Burkina Faso. They are named after...
rock units belonging to Birimian Supergroup, common across West Africa, dominate northwest and southwest Ghana. The Birimian Supergroup has two units...
volcano-sedimentary belt, which is formed by Paleoproterozoic rocks belonging to the Birimian basement rock. Development of an underground mine at Siou is underway with...
Paleoproterozoic era about 2200–2000 million years ago. During this period the Birimian domain in West Africa was established and structured. Eburnian faults are...
of rulers of the Akan state of Akyem Abuakwa List of rulers of Asante Birimian Geology of Ghana Gyaaman Tacky's War CIA World Factbook population total...
in Mali List of rivers of Mali Eburnean orogeny Kenieba inlier Bambouk Birimian "Mali country profile" (PDF). Library of Congress Federal Research Division...
assigned largely to the Birimian Supergroup, a suite of rocks in which can also economically significant mineralization occurs. Pre-Birimian migmatites, gneisses...
the West African Craton. The shield is in part overlaid by gold-bearing Birimian formations. The shield covers the countries Ivory Coast, Mali, Burkina...
Siguiri has a tropical savanna climate (Köppen climate classification Aw). Birimian "Le maire de Siguiri désavoue le préfet : " je ne reconnais pas sa décision...
cost of sale of US$721/oz. 2012 recoveries averaged 93%. Geology of Ghana Birimian Kinross Gold Corporation (13 Feb 2013). "Kinross reports 2012 fourth-quarter...
runs roughly south-west until it joins the Pra. It gives its name to the Birimian rock formation, which yields most of the gold in the region. Ghana is the...
which was acquired by the South African company in 2002. Geology of Ghana Birimian "Damang Gold Mine". goldfields.co.za. 2013. Retrieved 2013-06-18. "Gold...
formed beginning more than two billion years ago. The Archean greenschist Birimian rocks common throughout West Africa are the oldest in the country, intruded...
of the Birimian rocks, of the Ashanti Gold Belt. It is situated in the Bougouni basin and is underlain by sedimentary rocks of the Upper Birimian Group...
runs roughly south-west until it joins the Pra. It gives its name to the Birimian rock formation, which yields most of the gold in the region. Ghana is the...
Some gold mining still takes place on the Malian side of the border. Birimian Inlier Kenieba Curtin, Philip D. (1973). "The Lure of Bambuk Gold". The...
Shield to the north of West African Craton and Man Shield to its south – Birimian domain of West Africa established and structured. c. 2,200 Ma – Iron content...
Proterozoic rocks and its eastern region consists greenstone belts under the Birimian Supergroup which account for a major portion of West Africa's gold and...
Civilisations de Côte d'Ivoire". abidjan.net. 2012. Retrieved 10 April 2016. Birimian Economy of the Ashanti Empire Geology of Ghana http://www.geocities.com/gmmbacc/...
predate the 2.2 billion year old Proterozoic Birimian rocks common in much of West Africa. The pre-Birimian crystalline basement rocks include gneiss and...
complex consists of an underground and several open-pit mines that access Birimian rocks within the southern portion of the Ashanti Greenstone Belt. Golden...
only The 2019 results are from the December startup only Geology of Ghana Birimian Gyimi River "Three-year summary statistics 2020 (financial, operational...
shield, a large portion of the WAC consists of Paleoproterozoic Birimian continent. The Birimian units were initially produced in an immature volcanic arc setting...
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