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Certain gross aspects of the different lead-zinc-barìte-fluorspar deposits of this type in North America provide compelling guidelines that must be followed in determining the most likely mode of origin for the deposits. These field-determined facts must be the starting point for the interesting and illuminating laboratory investigations which are revealing what is or is not possible from a physical-chemical point of view.

Pertinent field facts that are discussed are: the multiplicity of elements involved, the large size of the ore districts, the cross-cutting relationships, the selective replacement phenomena, and the diversity of ore host rocks.

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