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Bauxite Deposits
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Book Chapter
Bauxite Deposits
2016
Overview
The procedures used for bauxite resource estimation are summarised using examples from Australia, Africa, South America and Asia. In the all studied cases the bauxite resources were estimated by drilling and sampling drill holes at 0.25–0.5 m intervals. Short sampling intervals are necessary for accurate estimation of the mineralisation contacts. Samples of the non-consolidated bauxites usually beneficiated by sieving and removing the barren fine grained material prior to chemical assays. Consolidated bauxites are not beneficiated and processed in a conventional manner. Bauxites density is preferably measured using the sand replacement method which is a formally certified technique for measuring bauxite density at the Australian deposits.
Bauxites grade is estimated using conventional geostatistical techniques, which are commonly applied after geometry of the bauxite seam is flattened using ‘equal thickness unfolding’ method, or, in some cases, using ‘top flattening’ approach. Conversion resources to the ore reserves requires the following mining and processing conditions to be taken into considerations:Haulage distance;A vertical mining selectivity of 0.25–0.5 m;Pre-production infill drilling is usually used for grade control purposes;Grindability of the bauxites and quantification of the Bond Work Index;Optimal mesh size for bauxite beneficiation;Detailed chemical and mineralogical characterisation of the crude bauxite, including deleterious components, in particular iron and silica;Characterisation of the pre-desilication behaviour of the bauxite;Characterisation of the alumina extraction;The refinery parameters, including recovered alumina, refinery caustic consumption and red mud loading;
Presence of the organic carbon, oxalate formation rate and carbonate formation rate;The mud settling rate, mud compaction and overflow clarity.
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