Petro-Structural and Metallogenic Study of the Kimoukro and Kokumbo Geological Formations (Côte d’Ivoire, WAC)

The Kimoukro and Kokumbo areas are marked by gold mining dating back to the colonial era. The objective of this work is to characterize the mineralization associated with the geological formations in this area. To achieve this, we conducted a petrostructural study and chemical analyses using portable XRF on the collected samples. Metaandesites, schists, metadolerites, metagabbro-doleritic granodiorites, quartz or calcite veins and veins represent the majority of the geological formations. They are affected by low- to medium-grade metamorphism of the greenschist facies and rarely amphibolite. Two deformation mechanisms are evident in the study area: flattening and shearing. The main fracture directions in the study area are SSE and ENE. Furthermore, the presence of C/S structures confirms the existence of a left-trending shear zone oriented N18˚, or NNE. The primary mineralization in the study area is gold, accompanied by pyrite, chalcopyrite, gray copper, and zinc. Mineralization is disseminated both in quartz or calcite veins and in their host rocks (greenstones and sericite schist). Gold is also found in laterites, alluvium, and colluvium.