Analysis Of Residual Ores

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Residual ore deposits are weathered material remaining in situ after soluble constituents have been removed, ore deposit in clay formed by near surface oxidation, e.g. bauxites, residual nickel, extensive iron laterites and soil, (Allaby, 2008). Hence weathering concentrates the residual of useful elements which forms an economic deposit. The relationship between weathering and ore formation is often a key ingredient that leads to the formation of a viable deposit by grade enhancement which commonly occurs in the surficial environment, (Robb, 2005).
Residual deposits is Weathered material remaining in situ after soluble constituents have been removed, or Ore deposit in clay formed by near-surface oxidation, e.g. bauxites (aluminium ore), residual
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The first condition form leaching to occur is the availability of rocks containing minerals of which the undesired ones insoluble under surface. Tropical and sub-tropical climatic conditions are most suitable conditions for chemical decay of those mineral found in-situ. A long continued crustal stability is essential for elements to accumulate and the deposit may be conserved by the topographical relief. For iron ores, under these conditions a limestone formation with minor iron oxides will slowly be dissolved leaving the insoluble iron oxides as a residue, which is sufficient thick to make a workable deposit. According to (Robb, 2005), Residual deposits form in two…show more content…
This ore deposit form by eluviation of nickel from the uppermost lateritic residuum and concentration in underlying saprolitic illuvium as nickeliferous talc, serpentine, or smectite or less commonly together with goethite, Prior to lateritization by interaction with sea water or during low grade metamorphism the olivine and orthopyroxene are rapidly
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