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Structural Pattern Related to Gold Mineralization in the Essakane Area (Northern Burkina Faso, West African Craton)

Open Journal of Geology 2024年第9期14卷 855-879页

作者： Marc desire Valea Benjamin Sawadogo Kalidou Traoré Urbain Wenmenga Naba Seta Benjamin Allou laboratoire Gosciences et Environnement (LaGE) Dpartement des Sciences de la Terre Universit Joseph Ki-Zerbo Ouagadougou Burkina Faso Essakane Sarl IAMGOLD Corporation Ouagadougou Burkina Faso laboratoire de godynamique et de cartographie Universit des Sciences des Techniques et des Technologies de Bamako Bamako Mali

The finite deformation structures recorded in the Essakane area, located in the northeast corner of Burkina Faso, highlight three major compressive deformation phases, successively named D1, D2, and D3. The D1 event phase, trending NE-SW, is characterised by P1 folds and S1 axial plane schistosity. The D2 phase trending NW-SE is characterised by folds P2, schistosity (S2) and shear (C) planes. And the D3 phase trending NNE-SSW to N-S is characterised by P3 folds, crenulation microfolds and S3 spaced schistosity. It has also been noted that gold mineralizations are mainly hosted in quartz, carbonate, pyrite, and arsenopyrite veins. Structural interpretation indicates that these veins are organized into lenticular bodies that were formed during the first two deformation phases (D1 and D2). This suggests a strong structural control typical of orogenic gold concentrations.

关键词： Burkina Faso Essakane Shear Zone deformation Phases Orogenic Gold

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Geochemistry of Magmatic Rocks of the Syama Belt, Southern Mali, West African Craton

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Open Journal of Geology 2022年第3期12卷 250-272页

作者： Dasso Yollande Traoré Seko Sanogo Adama Youssouf Koné Ismaïla N’Diaye Mamadou Lamine Bouaré Didier Béziat laboratoire de cartographie DER de Géologie Faculté des Sciences et Techniques (FST) Université des Sciences des Techniques et des Technologies de Bamako (USTTB) Bamako Mali laboratoire de Minéralogie et de Pétrologie DER de Géologie Faculté des Sciences et Techniques Université des Sciences des Techniques et des Technologies de Bamako Bamako Mali Ecole Nationale d’Ingénieurs Abdramane Baba Touré (ENI-ABT) Bamako Mali Université Paul Sabatier de Toulouse Toulouse France

Within southern Mali, the Syama belt constitutes a linear major structure-oriented N-S, which host several gold deposits (e.g., Syama and Tabakoroni) and prospect areas (e.g. Tellem). The Syama Belt is formed by magmatic rocks (basalts, lamprophyres, andesites, dacites and microgranites);sedimentary rocks (shales) and volcano-sedimentary rocks (pyroclastics). The magmatic rocks are divided into two main volcanic series: tholeiitic affinity rocks (basalts and lamprophyres) and calc-alkaline affinity (andesites) that are the most evolved. The field relationships between rocks of these two series suggest that the calc-alkaline series are younger the tholeiitic series. These tholeiitic series present the Mid-Ocean Ridge Basalt (MORB) affinity whereas the calc-alkaline series would be linked to an island arc-type. This coexistence is not an isolated case within the West African Craton (WAC). Otherwise, the Syama belt has all the characteristics of other belts, within which a number of gold deposits are developed, in the WAC.

关键词： Syama Belt Magmatic Rocks MORB Boualé-Mossi Domain Southern Mali West African Craton (WAC)

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Valorisation of Auriferous Indices: Case of the Siribaya deposit, Western Mali

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Open Journal of Geology 2021年第10期11卷 457-470页

作者： Fodé Tounkara Jianguo Chen Mory Sidibe Oumar Soumare Adama Youssouf Koné Université de Ségou Ségou Mali State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan China Ecole Nationale d’Ingènieurs Abderhamane Baba Touré Bamako Mali laboratoire de cartographie Département de Géologie Faculté des Sciences et Techniques (FST) Université des Sciences des Techniques et des Technologiques de Bamako (USTTB) Bamako Mali

The purpose of this paper is to understand the valorization of gold showings in the Seribaya deposit, western Mali. Samples taken from Air Core (AC) boreholes were subjected respectively to the magnetic susceptibility test and the X-ray fluorescence analysis. These results lead to the development of a simple methodology, based on signatures/indicators geochemical to identify lithology or to locate mineralization. We note that, compared to other chemical elements, Arsenic remains the most correlated with gold in the study area. Since this correlation remains weak (r = 0.16), it shows that Arsenic does not always accompany gold. There would be a generation of Arsenic related to mineralization, and other generations that would not be. The observation of the strip logs led to the identification of the lithologies (focusing on the immobile elements, Ti, V, Cr, Y, Zr) and the establishment of the alteration profile. Highly altered levels (Saprolite ± Saprock) are characterized by the disappearance of most mobile elements. A medium to strong correlation between gold mineralization and magnetic susceptibility measurements has been observed, in some places, and at depths. These mineralized intervals typically consist of quartz veins, suggesting that they have structural control over the mineralization. Gold mineralization is believed to be related to quartz veins. In addition, gold would be in paragenesis with a generation of Arsenic hosted in coarse sediments.

关键词： Valorization Gold Index Strip Logs Magnetic Susceptibility

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