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Gold Mining Deposits

Gold-only porphyries such as at fort knox alaska appear to occur at higher levels than cu-au porphyry deposits which are themselves at higher levels than cu-mo porphyritic intrusives as described schematically in fig. 2.24.the fluids are thought to be initially hot 500600 c but zoned alteration assemblages are formed at lower temperatures as the metal-bearing fluid cools and reacts.

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