Phase diagrams for the ore minerals in the systems Cu-Fe-S, Fe-O-S, Cu-As-S, Pb-As-S and Pb-Sb-S are postulated, based on the observed sequence in various mining districts.These diagrams strongly suggest the sequence of phases that appear in each of these systems and can be readily explained by assuming an increase in chemical potential of sulfur in the fluid mineralizing phase relative to that of the solid phases during the period when final adjustments in relations among the solid phases is taking place. The sequence of phases at a point in a vein and the sequence of introduction of components into a vein are not necessarily the same.

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