Geology and petrography of the Limbiko Bauxite Deposit, Republic of Guinea

High demand for aluminium spurs research to satisfy it. Starting from Paleozoic and up to Cenozoic, bauxite deposits formed mostly owing to residual accumulation of aluminium as a result of alteration of high-aluminum rocks. Being the main source for the aluminium industry, bauxite is a rock mostly composed of aluminium hydroxide minerals, often with low content of silica and iron oxides. Prime bauxite deposits formed as a result of laterite processes in the early Cenozoic in Central Africa (Cameroon), West Africa (Guinea), Australia, Vietnam and Brazil. This article describes the geology of the Limbiko Bauxite Deposit in the Republic of Guinea. The study methods include sampling, stratigraphic columns and geological map-ping. The Limbiko region is composed of the Devonian sedimentary rocks intruded in the Mesozoic dolerite layers. The underlying rocks are overlaid with the weathering crust. Petrog-raphy research reveals bauxite and transition zones of ferruginous laterite. The microscopic analysis shows the presence of hydrargillite, goethite, alumogoethite, rutile and clay minerals. © 2025 Elsevier B.V., All rights reserved.