Attention is directed to the regional and stratigraphical association of strata-bound copper ores with evaporites, and arguments are presented in support of the thesis that intra-stratal brines derived from the diagenesis and lixiviation of salt deposits have circulated to a depth of two or three miles, leached copper from primary sulfide disseminations of magmatic origin in regions with a high geothermal gradient, and on ascending to shallower and cooler environments redeposited the metal where chemical and structural conditions were favorable.

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