The Kalana vein-hosted gold deposit,southern Mali |
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| Institution: | 1. Université de Toulouse, CNRS, Géosciences Environnement Toulouse, Institut de Recherche pour le Développement, Observatoire Midi-Pyrénées, 14 Av. Edouard Belin, F-31400 Toulouse, France;2. Université Sidi Mohamed Ben Abdellah, Faculté des Sciences Dhar El Mahraz, Département de Géologie, BP 1796 Fès, Morocco;3. Iamgold Exploration, 3503 Av. Al Qods Hippodrome, BP 2699 Bamako, Mali;4. Avnel Gold Mining Limited, 39 Cheval Place, London SW7 1EW, UK;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, 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. Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, 5166616471 Tabriz, Iran;2. Department of Geology, Faculty of Science, University of Zanjan, 45371-38791 Zanjan, Iran;3. ARC Centre of Excellence in Ore Deposits (CODES), School of Physical Sciences, University of Tasmania, Private Bag 79, Hobart, Tasmania 7001, Australia |
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| Abstract: | The Kalana gold deposit occurs within metamorphosed Paleoproterozoic volcano-sedimentary series of the Birimian Baoulé-Mossi domain of the West African Craton, in the south of Mali. These formations are intruded successively by small dioritic bodies, as well as andesitic and tonalitic dykes, which exhibit volcanic arc-setting signatures. Mineralization is hosted by two sets of quartz veins that intersect the regional schistosity. The first set of veins is the most important in terms of grades and size, and consists of thick veins (up to meter size) that range in trend from N–S to E–W with shallow plunges. The second set consists of much thinner (centimeter size) sub-vertical quartz veins oriented NE–SW. The two sets of veins are interpreted to have formed during the evolution of late, gently dipping thrust faulting. Two episodes of gold precipitation are recognized: a first episode, during early stages of vein growth, formed micron-size native gold inclusions in arsenopyrite; a later episode, during vein shearing and fracturing of the quartz lodes, precipitated native gold in free form in quartz, in fractured arsenopyrite, and associated with chalcopyrite, galena, sphalerite, Bi sulfides and native bismuth. All evidence suggests that the Kalana deposit represents orogenic gold mineralization formed during a relatively long-lived hydrothermal system, at a late stage of the tectonic history of the greenstone belt. |
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