Recent work by Anderson (1973) is used to support the hypothesis that Mississippi Valley-type ores were formed by the mixing of two brines: basinal fluids and the host rock formational fluids.Ore emplacement was characterized by a lack of concurrent solution of host limestone. White sparry dolomite and less common calcite gangues were stable during sulfide precipitation.Superficially similar but fundamentally different ores have precipitated by other mechanisms; the Upper Mississippi Valley ores described by Heyl et al. (1959) and the ores of the Cracow-Silesia region described by Bcgacz et al. (1970) are possible examples.

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