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Porphyry Cu ± Mo ± Au deposits (porphyry) and iron oxide copper-gold deposits formed by magmatic-hydrothermal systems (MH-IOCG) share many features, most notably enrichments in Fe, Cu, and Au, as well as an association with calc-alkaline to mildly alkaline magmas generated in orogenic (subduction to collision) and postorogenic tectonic settings. Differences include the predominance of Fe-sulfide minerals and widespread late-stage acidic alteration in porphyry deposits, compared with Fe-oxide minerals and more extensive near-neutral pH alteration in MH-IOCG deposits. They are also separated by temporal distribution, with MH-IOCG deposits predominantly forming in the Precambrian era and porphyry deposits predominantly forming...

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