Porphyry copper deposits describes copper ore bodies which are formed from large copper ore bodies due to the high temperature exerted by magmatic fluid originating below the ore deposit.
- Weathered portion of the Porphyry copper resulting from the reaction of hydrothermal fluid are washed to greater depth level below the unweathered portion of the deposit.
- Copper deposits at greater depth are usually more concentrated with copper than those above.
Hence, reason why weathered porphyry are more valuable than unweathered porphyry.
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