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Heavy mineral sands ore deposits Heavy minerals (dark) in a quartz beach sand ... The grade of a typical heavy mineral sand ore deposit is usually low. Within the 21st century, the lowest cut-off grades of heavy minerals, as a total heavy mineral (THM) concentrate from the bulk sand, in most ore deposits of this type is around 1% heavy …

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Ironsand also known as iron-sand and iron sand is a type of sand with heavy concentrations of iron. It is typically dark grey or blackish in colour. It is composed mainly of magnetite, Fe 3 O 4, and also contains small amounts of titanium, silica, manganese, calcium and vanadium. Ironsand has a tendency to heat up in direct …

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It is black or red in fine aggregates and thin crystals. Inclusions in quartz may occur in finely dispersed forms, as small shiny "flakes" as well as large crystals. Limonite is not a mineral, but a mixture of various hydrous iron oxides, mainly goethite and lepidocrocite. Goethite, α-FeOOH, one of several polymorphs of FeOOH, is very common ...

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