Abstract
Evidence of mineral associations in natural ores is reviewed and used as a basis of phase diagrams for the quaternary system Cu-Fe-As-S. Published experimental work is used to supplement this evidence. Diagrams proposed in earlier papers are revised and made more complete. A number of assemblages are denoted which should be observed as indicative of their conditions of formation. If studied experimentally they might be useful indicators of temperature and S activity. Several paragenetic paths of increasing S content and constant Cu/Fe ratio are described, which define certain sequences of assemblages apparently characteristic of some Cu mining districts. Zonal progressions of assemblages in some districts appear also to manifest these sequences.
Published Version
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