Manganese deposits of the Oudalan province in the northeast of Burkina Faso,and Ansongo Inlier in eastern Mali |
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| Institution: | 1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Geology, Ravenshaw University, Cuttack, Odisha, India;2. Odisha Mining Corporation, Odisha, India;3. Utkal University, Bhubaneswar, Odisha, India;4. CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha, India 751013;1. Department of Geology, School of Natural Sciences, Trinity College, Dublin 2, Ireland;2. Laboratoire GET, Université Toulouse 3 Paul Sabatier, IRD, CNRS UMR 5563, Observatoire Midi-Pyrénées, 31400 Toulouse, France;3. Centre for Exploration Targeting, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;4. Terracognita Geological Consulting Inc., P.O. Box 100, 4874 St. Clair Parkway, Port Lambton, ON N0P 2B0, Canada;5. Mineral Exploration Consultant, 96 Marlow St, Wembley, WA 6014, Australia;6. Department of Geology, School of Natural Sciences, Trinity College Dublin 2, Ireland;1. Université de Toulouse; UPS/IRD/CNRS, GET, 14 av. E. Belin, F-31400 Toulouse, France;2. Mesté Duran 32100 Condom, France |
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| Abstract: | At least 15 manganese deposits crop out in the West African craton in Mali, Burkina Faso, Ghana and Cote d'Ivoire. There average grade estimates range from 17 to 52% total Mn oxide and average volume of 5–19 Mt of ore; they consequently provide an attractive target for exploration and eventual exploitation. The Tambão and Béliata Mn oxide deposits in the Oudalan province (northeast of Burkina Faso), and Takavasita, Agualla and Tondibi Mn oxide deposits in the Ansongo Inlier (eastern Mali) generally crop out as a saprolitic residuum that formed during the Miocene to Eocene and are enriched in manganese to 52% total Mn oxide. The saprolitic residuum is overlain by blocky to botryoidal manganese-rich duricrusts that form part of the resource portfolio. The residuum overlies deeply weathered manganese-bearing carbonates, shales and volcaniclastic siltstones of the Birimian Supergroup (2.3–2.1 Ga) that form a low-grade resource and likely formed in a heat-driven seawater convection system that provided hydrothermal solutions from submarine volcanic centers. They are typically intercalated with mafic-intermediate volcanic rocks. |
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