practice, this is complicated by composite particles,
minor undesirable minerals such as garnet and fine silica and, to varying extents, the blurring of the conducting and non-conducting properties by surface coatings. The deposits of the West Coast of Australia are much older, having been formed during the inter-glacial periods. Oxides from the degradation of the iron in some of the heavy minerals and fine clays from the breakdown of feldspars have combined to form coatings on the sand grains which are more di cult to remove. The leaching of the ilmenite has created an abundance of intermediate minerals described as altered ilmenite and leucoxene, in
ascending order of TiO2 content. These minerals have less distinct separation characteristics – in terms of
conductivity and magnetic susceptibility – and, com- bined with the increased surface coating problems, result in very complex (and capital intensive) dry plant circuits.
practice, this is complicated by composite particles,minor undesirable minerals such as garnet and fine silica and, to varying extents, the blurring of the conducting and non-conducting properties by surface coatings. The deposits of the West Coast of Australia are much older, having been formed during the inter-glacial periods. Oxides from the degradation of the iron in some of the heavy minerals and fine clays from the breakdown of feldspars have combined to form coatings on the sand grains which are more di cult to remove. The leaching of the ilmenite has created an abundance of intermediate minerals described as altered ilmenite and leucoxene, inascending order of TiO2 content. These minerals have less distinct separation characteristics – in terms ofconductivity and magnetic susceptibility – and, com- bined with the increased surface coating problems, result in very complex (and capital intensive) dry plant circuits.
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