Processes that form deposits of metalliferous ores
- Created by: Former Member
- Created on: 07-12-18 16:20
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- Processes that form deposits of metalliferous ores
- residual deposits
- forms sedimentary ores & is source of aluminium
- chemical weathering of granite removes soluble substances in solution to leave insoluble residue
- need hot/humid climate for intense chemical weathering
- clays break down and leaves hydrated oxides of iron & aluminium
- placer deposits
- alluvial environment
- ore is formed from dense minerals and that are resistant to erosion
- they are transported by rivers & deposited in meanders according to density
- casserite is good placer mineral as chemically resistant & has a density of 7
- secondary enrichment of copper containing ores
- when rocks containing chalcopyrite are exposed at surface they undergo chemical weathering to cause secondary enrichment
- metals are leached (elements dissolved from rocks) from surface rocks & precipitated just below the water table
- when rocks containing chalcopyrite are exposed at surface they undergo chemical weathering to cause secondary enrichment
- residual deposits
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