Abstract

In contrast to the vein-type deposits in the southern (Kilo) area, the economically important gold ores of the northern (Moto) sector of the Kilo-Moto district, Congo region, are impregnation deposits in Kibalian schists (Precambrian), commonly in a carbonate-quartz-albite rock and often in close association with bodies of itabirite and bands of black schist. The ore bodies do not appear to be associated with any known structural feature; their general concordance with planes of foliation or schistosity suggests that permeability resulting from a high proportion of carbonate in the country rock may have been a controlling factor in mineralization.

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