Abstract

The deposits include hard massive ores composed mainly of braunite, manganite, jacobsite, and vredenburgite associated with bodies of gonditic (quartz-spessartite) rock in the predominantly schist and quartzite terrain, and colloform manganese dioxide replacement ores in mica schists. The former type, like other gonditic ores of the Madhya Pradesh-Bombay manganese belt, resulted from metamorphism of manganiferous sediments. The replacement deposits have been attributed to supergene alteration and enrichment of the gonditic ores, but are here considered to reflect deposition from colloidal solutions which invaded the schistose rocks along foliation and fault planes.

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