The semi-industrial permit of Koffissiokaha, south-eastern area of Katiola, is located in the northern part of Fêtêkro Birimian Greenstone Belt (C ô te d’Ivoire). This permit, applicated by the company Blue-Hill Exploration Sarl (BHEX), is in the southern continuity area of Lafigué permit (Endeavour Mining). Blue-Hill will have to work to highlight potential gold mineralization, quantify it (resource calculation) and initiate administrative procedures to obtain a Semi-Industrial Exploitation Authorization (AESI). Our recent works, including field mapping coupled with petrographic and microstructural studies, are therefore intended to contribute to the knowledge of the geology and to the evaluation of the gold potential of this permit. They suggest that Koffissiokaha permit includes four major lithologic units: 1) a sedimentary unit formed by metaarenites and metasiltites, 2) a unit of mafic pyroclastites (cinerites, tuffs and volcanic breccias) 3) a plutonic unit of metagabbro and finally, 4) a lode-type unit made up of metarhyodacites. The metamorphism that affected the volcano-sedimentary rocks is of low grade to greenschist facies. On the structural level, deformations with variable gradients are noted. The major planary structure, the schistosity, is oriented N20 - 40 with weak (<40 ° ), moderate (50 ° - 60 ° ) and steep dips (>70 ° ) or subvertical. The faults generally correspond to narrow dextral or senestral shear-zones (<50 m width) with subhorizontal stretching lineation. These faults strike NNE-SSW with steep dips (>75 ° ) towards south-east or subvertical. They are most often intersected by late strike-slip faults-oriented NW-SE, NNW-SSE and N-S. Quartz veins are associated with faults or deformation zones. They are generally oriented N20 to N40, with weak (<40 ° ), moderate (55 ° - 65 ° ) and steep dips (>75 ° ). Orientations of joints and fractures are mostly subparallel to the plans of schistosity, shears and most of quartz veins. However, ENE, WNW and N-S fractures are also distinguished. The sulphide paragenesis consists of pyrites (and pyrrhotites), arsenopyrites and chalcopyrites. Gold mineralization is controlled by both structural and hydrothermal parameters.
Leake, M.H. (1992) The Petrogenesis and Structural Evolution of the Early Proterozoic Fetekro Greenstone Belt, Dabakala Region, NE Cote d’Ivoire. PhD. Thesis, University of Portsmouth, Portsmouth, 315 p.
Gnanzou, A. (2014) Study of Volcanosedimentary Series of Dabakala Region (North-East of Cote d’Ivoire): Genesis and Magmatic Evolution. Contribution to the Knowledge of Bobosso Gold Mineralization Located in the Haute-Comoe Serie. Thesis Unique, Université de Paris-Sud Paris XI, Faculté des Sciences d’Orsay, Bures-sur-Yvette, Memory, 258 p.
Houssou, N.N. (2013) Petrological, Structural, Geochem and Metallogenic Study of the Agbahou Gold Deposit, Divo, Cote d’Ivoire. Thesis Unique, Université Felix Houphouet Boigny-UFR STRM, Memory, 257 p.
Houssou, N.N., Allialy, M.E., Fossou, J-L.H.K. and Gnanzou, A. (2017) Structural Control of Auriferous Mineralization in the Birimian: Case of the Agbahou Deposit in the Region of Divo, Cote d’Ivoire. International Journal of Geosciences, 8, 189-204. https://doi.org/10.4236/ijg.2017.82008 http://www.scirp.org/journal/ijg
Ouattara, Z. (2015) Lithostratigraphic, Structural, GEOCHEM and Metallogenic Characters of Bonikro Gold Deposit, Fettekro Birimian belt, Centre-South of Cote d’Ivoire. Thesis Unique, Université Felix Houphouet Boigny-UFR STRM, Abidjan, Memory, 330 p.
Ouattara, Z., Coulibaly, Y. and Lieben, F. (2015) Petrography of Bonikro Gold Deposit, Oume-Fettekro Greenstone Belt. Cote d’Ivoire. European Scientific Journal, 11, 119-132.
Ouattara, A.S. (2018) Le gisement aurifère de Dougbafla-Bandama (Sud du sillon birimien de Fettékro, Oumé, Cote d’Ivoire): Pétrographie, déformation, géochimie et métallogénie, Doctorat, Université Felix Houphouet-Boigny, Abidjan, 252 p.
Ouattara, A.S., Gnanzou, A., Coulibaly, I., Coulibaly, Y. and Gone, L.D. (2021) Lithostratigraphic Characteristics of the Birimian Formations of Dougbafla-Bandama Zone (South of Fêtêkro Birimian Belt, Central-Western of Cote d’Ivoire). International Journal of Innovation and Scientific Research, 57, 213-222. http://www.ijisr.issr-journals.org/abstract.php?article
Bamba, A. (2018) Contexte lithostructurale de la minéralisation du permis aurifère de Gogo (Téhini, Nord-Est de la Cote d’Ivoire). Mémoire de Master, UFR-STRM, Université Felix Houphouet Boigny, Abidjan, 48 p.
Tagini, B. (1971) Esquisse structurale de la Cote d’Ivoire; Essai de géotectonique régionale. Doctorat, Univ. Lausanne, Cote d’Ivoire (SODEMI), Bulletine No. 5, 302 p.
ocirc
te d’Ivoire
Yacé, I. (1993) Les complexes volcano-sédimentaires précambriens en Afrique de l’Ouest. Symposium sur le protérozoique inférieur, CIFEG, 1993/23.
Lemoine, S. (1988) Evolution géologique de la région de Dabakala (NE de la Cote d’Ivoire) au Protérozoique inférieur. Doctorat ès Sciences, University of Clermont-Ferrand, 388 p.
Boher, M. (1991) Croissance crustale en Afrique de l’Ouest à 2,1 Ga. Apport de la Géochimie isotopique. Doctorat, University of Nancy-I, 180 p.
Arnould, A. (1961) Etude géologique des migmatites et des granites précambriens du nord-est de la Cote d’Ivoire et de la Haute-Volta méridionale. Mémoire BRGM., No. 3, 175 p., 44 fig., 12 pl.
Bonhomme, M. (1962) Contribution à l’étude géochronologique de la plate-forme de l’Ouest Africain. Doctorat, Ann. Fac. Sc., University of Clermont-Ferrand, No. 5, 62 p.
Yacé, I. (1982) Etude géologique du volcanisme Eburnéen dans les parties centrale et méridionale de la chaine précambrienne de Fêtêkro. Ministère des mines, République de la Cote d’Ivoire, 156 p.
Mortimer, J. (1990) Evolution of Early Proterozoic Toumodi Volcanic Group and Associated Rocks, Ivory Coast. Ph.D. Thesis, University of Portsmouth, Portsmouth, 244 p.
Daouda, Y.B. (1998) Lithostratigraphie et pétrologie des formations birimiennes de Toumodi-Fêtêkro, Cote d’Ivoire: implication pour l’évolution crustale du Paléoprotérozoique du craton Ouest-Africain. Doctorat, University of Orléans-Géosciences, Mémoire, 191 p.
Sangaré, A., Driouch, Y., Salvi, S., Féménias, O., Siebenaller, L., Belkasmi, M., Béziat, D., Dahire, M., Ntarmouchant, A., Adil, S. and Debat, P. (2014) Géologie des minéralisations aurifères du gisement tardi-éburnéen de Kalana (Birimien, Sud-Ouest du Mali). Bulletin de l’Institut Scientifique, Rabat, Section Sciences de la Terre, No. 36, 85-108.
Coulibaly, I., Kouamelan, A.N., Djro, S.C. and Coulibaly, Y. (2017) Pétrographie des volcanites et plutonites de la partie sud du sillon volcano-sedimentaire de toumodifetekro (Cote d’Ivoire). European Scientific Journal, 13, 199-221.
Coulibaly, I. (2018) Petrography of the Volcanics and Plutonites of the Southern Part of the Toumodi-Fêtêkro Volcanosedimentary Belt. Thesis, Université Félix Houphouet-Boigny, Abidjan, 221 p.
Assié K.E. (2008) Lode Gold Mineralization in the Paleoproterozoic (Birimian) Volcano-Sedimentary Sequence of Afema Gold District, Southeastern Cote d’Ivoire. Thesis, Faculty of Energy and Economic Sciences, Technical University of Clausthal, Germany, Clausthal-Zellerfeld, 180-210.
Touré, B. (2018) Les altérations hydrothermales liées à la minéralisation du prospect aurifère de Lafigué (Boniérédougou Centre-Nord de Cote d’Ivoire). Mémoire de Master, UFR-STRM, Université Félix-Houphouet-Boigny, Abidjan, 30-47.
Tegan, E.S. (2018) Initiation à la volcanologie du Birimien (Sillon de Toumodi-Fêtêkro, centre de Cote d’Ivoire). Mémo de Master, UFR-STRM, Université Félix-Houphouet-Boigny, Abidjan, 33-37.
Diomandé, I. (2019) Pétrographie, étude structurale et cartographie des formations du projet aurifère de Nanglékoffikro (s/p de Djekanou, centre de la Cote d’Ivoire). Mémo de Master, UFR-STRM, Université Félix-Houphouet-Boigny, Abidjan, 57 p.
Dai Bi, S.M., Ouattara, G., Gnanzou, A., Koffi, G.B., and Coulibaly, I. (2020) Metallotectic Context of the Mineralization of the Tondabo Gold Prospect (Brobo, Center of Cote d’Ivoire, West Africa). International Journal of Geosciences, 11, 325-344. https://doi.org/10.4236/ijg.2020.115017
Kramo, K.B., Coulibaly, Y., Pothin, K.B.K. and Kadio, E. (2008) Mineralogical and Chemical Characters of the Aféma Shear Zone Gold Mineralization, South-East of Ivory Coast: Example of the Hermann Mine. European Journal of Scientific Research, 21, 154-163.
Oberthür, T., Schmidt, M.A., Vetter, U., Simon, K. and Amanor, J.A. (1996) Gold Mineralization in the Ashanti Belt of Ghana: Genetic Constraints of the Stable Isotope Geochemistry. Economic Geology, 91, 289-301. https://doi.org/10.2113/gsecongeo.91.2.289
Oberthür, T., Weiser, T. and Amanor, J.A. (1997) Mineralogical Siting and Distribution of Gold in Quartz Veins and Sulphide Ores of the Ashanti Mine and Other Deposits in the Ashanti Belt of Ghana: Genetic Implications. Mineralium Deposita, 32, 2-15. https://doi.org/10.1007/s001260050068
Vial, D.S., Duarte, B.P., Fuzikawa, K. and Vieira, M.B.H. (2007) An Epigenetic Origin for the Passagem de Mariana gold deposit, Quadrilátero Ferrífero, Minas Gerais, Brazil. Ore Geology Reviews, 32, 596-613. https://doi.org/10.1016/j.oregeorev.2005.03.017
Brempong, F., Wemegah, D., Preko, K., Armah, T., Boadi, B., Menyeh, A., Oppong, I., Quarshie, M., Aning, A., Asare, V. and Noye, R. (2019) Interpretation of Geological Structures Hosting Potential Gold Deposits in the Konongo Gold Mine Using Airborne Magnetic, Electromagnetic and Radiometric Datasets. Journal of Geoscience and Environment Protection, 7, 203-225. https://doi.org/10.4236/gep.2019.76016
Sinclair, C. (1999) Rapport trimestriel projet d’Agbahou PR No. 100. Goldivoire SARL, 18 p.