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Mississippi Valley type base metal ore deposits are strata-bound in nearly horizontal carbonate rocks lacking congruent tectonic structures which might control their localization. Commonly they are remote from post-host rock igneous intrusives and through-going plumbing systems which might serve respectively as source and conduit for mineralizing solutions. They are further characterized by an association with dolomite in many instances, not all; by relatively simple mineralogy and by textures which indicate the dominant process of mineralization was filling and not replacement. Sulfide and carbonate mineral detritus locally are present in the breccia matrix of some of them.

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