Uranium and gold are associated with pyrite in the matrix of Precambrian quartz pebble conglomerates in the Canavieiras mine area, Jacobina range, Brazil. Similarities between these deposits and those of the Witwatersrand (South Africa) and Blind River (Ontario) districts suggest that the ore-bearing conglomerates represent the product of similar cycles of erosion, sedimentation, and mineralization in a restricted (late Precambrian) interval of geologic time.

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