The gold-quartz and gold-bearing sulfide lodes of the Kolar field consist of north-striking, steeply west-dipping zones of en echelon veins, lenses, and stringers in intensely deformed and altered Precambrian schistose amphibolites (metabasalt), generally at or near contacts with massive amphibolite of the central zone or with granular amphibolite (metadolerite and metagabbro) or fibrous amphibolite (metapyroxenite?). The richest ore shoots are localized along crests and troughs of en echelon cross folds, and the highest grade mineralization has been found on either side of the Mysore North fault along the major axis of cross- folding. Vein mineralogy, the character of wall-rock alteration, and other features indicate the deposits to be of high-temperature hydrothermal origin.

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