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17 Cards in this Set
- Front
- Back
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Rain water infiltrates the Cu deposit and does what? |
Percolates |
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Above the water table what happens to CuS?
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Oxidised to CuSO4
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What 'zone' is formed near the surface? |
Leached zone |
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What covers the leached zone? |
Gossan |
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Secondary enrichment of chalcopyrite occurs in what types of deposits? |
Cu |
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Secondary enrichment is not an ore forming process but an? |
Ore concentrating |
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Large low grade deposits of chalcopyrite undergo what that leads to secondary enrichment? |
Chemical weathering |
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'A zone of high grade ore just below the water table, formed by secondary enrichment' |
Enriched deposit |
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'Large igneous intrusion below a volcano with a porphyritic texure' |
Porphry |
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What is chalcopyrite? |
Cu Fe S2 |
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'Occurs when metals are leached from surface rocks and precipitated below the water table' |
Secondary Enrichment |
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'An insoluble cap of Fe Oxides at the surface' |
Gossan |
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Just above the water table what is precipitated? |
Cu Oxides Cu Carbonates |
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Give specific examples of what is precipitated above the what is precipitated above the water table? |
Azurite Malachite |
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At the water table condition change from...? |
Oxidising to reducing |
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What chemical reaction occurs below the water table? |
CuSO4 reduced to CuS |
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What is deposited below the water table? |
High grade Cu |
