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Analysis of the Spatio-Temporal Evolution of Artisanal and Small-Scale Gold Mining in Central Ivory Coast, West Africa

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Journal of Geoscience and Environment Protection 2022年第9期10卷 136-148页

作者： Gbele Ouattara gnammytchet barthélémy koffi Allou Gnanzou Kouakou Alphonse Yao laboratory of Civil Engineering Geosciences and Geographic Sciences National Polytechnic Institute Félix Houphou&#235 t-Boigny Ya-moussoukro Ivory Coast laboratory of Geology Basement and Metallogeny UFR-STRM Félix Houphou&#235 t-Boigny University Abidjan Ivory Coast

Ivory Coast is a country rich in base metals and precious minerals: gold, manganese, diamond, iron, bauxite, cobalt and nickel. These natural resources are exposed to destruction and fragmentation by mining activities. The artisanal and small-scale exploitation of gold are increasingly practiced in our rural areas. These activities escape often in the control and monitoring of the mining administration. In order to better constrain these activities on the environment, the present work used remote sensing imageries to see its spatio-temporal impacts in the rural world in central Ivory Coast. The results show that gold artisanal activities have been practiced since 2013 and are experiencing an increasingly important growth. We note a devastation of forests and savannahs, a pollution of surface water, as well as an increase in poverty in rural areas. These activities are practiced near habited areas (villages). This creates a reduction of cultivatable soil. Remote sensing imageries make it possible to quickly map areas at large-scale gold mining in time and space.

关键词： Gold Panning Artisanal Mining Space and Time Remote Sensing Imageries Ivory Coast West Africa

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Metallotectic Context of the Mineralization of the Tondabo Gold Prospect(Brobo,Center of Cote d’Ivoire,West Africa)

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International Journal of Geosciences 2020年第5期11卷 325-344页

作者： DaI Bi Seydou Mathurin Ouattara Gbele Gnanzou Allou koffi gnammytchet barthelemy Coulibaly Inza laboratoire des Geosciences Cadre de vieEnvironnement et Sciences GeographiquesInstitut National Polytechnique Felix Houphouet-BoignyYamoussoukroCote d’Ivoire laboratoire de Geologie du Socle et Metallogenie UFR-STRMUniversite Felix Houphouet-BoignyYamoussoukroCote d’Ivoire

The gold mineralization of the Tondabo prospect, located in the northern part of the Oumé-Toumodi-Fettêkro greenstone belt, is mainly hosted in the rhyodacite and to a lesser extent in the mafic volcanics (volcanic lavas and volcanoclastites). These rocks were affected by a hydrothermal alteration marked by quartz veins and veinlets associated with crystals of carbonates, sericite, epidote and sulfides. This hydrothermal alteration induced a pervasive alteration of the surrounding bodies with silicification, chloritization, carbonation and sericitization of the feldspars. The metalliferous paragenesis contains an abundant pyrite, with rare pyrrhotite and chalcopyrite. This mineralization indicates that the Tondabo gold prospect exhibits lithological control. The mineralized deposits are generally affected by a S1 schistosity oriented mainly N000-010° and minority N040-050° with a general dip of 60°-80°to the West;however with rare N-S orientations with a dip of 60°-80° to the East. The drilling intervals show that the highest gold contents are linked to the quartz-carbonates veins and veinlets, which are located in the highly deformed zones, characterizing local shear zones.

关键词： Gold Mineralization Rhyodacite Structures Hydrothermal Alteration Tondabo Cote d’Ivoire

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