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Location: 40 km SW from Juruti, Brazil
Enseada do Lago Grande, Juruti-Rodovia PA 257, km 0,5. S/NJurutiBrazil68170-000
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The bauxite deposit of the Juruti bauxite mine consist of several lateritic bauxite plateaus which exist over a large lateral extent (several km) in comparison to the total thickness of the deposit (typically up to 20 m below surface).Juruti is a lateritic bauxite deposit formed through a combination of intense weathering and geochemical alteration, leaching by meteoric waters, and accumulationof alumina and iron-rich horizons. Periodic erosion and redeposition is also known to have occurred. The lateritic deposits have originated from the Alter-do-Chao Formation; Cretaceous fluvial-lacustrine deposits of sandstone, siltstones, mudstones, and quartzbreccia. Weathering and alteration of these parent rocks is estimated to have taken place during the Eocene. Bauxitization has occurred through the formation of gibbsite crystals which form massive bauxite horizons which exist as plateaus across the Juruti region. Incomparison to their lateral extent over tens of kilometers, the overall thickness of the bauxite deposits are relatively thin being only several metres thick.MineralizationBauxite mineralization principally occurs as microcrystalline gibbsite (Al(OH)3), along with accessory minerals of hematite (Fe2O3), goethite (FeO(OH)), kaolinite (Al2Si2O5(OH)4),and anatase (TiO2). The mineralization of each of the stratigraphic horizons observed across the Juruti deposits are classified based on a combination of visual inspection during drilling and sampling, and the results of chemical analysis.
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