Detrital bornite grains in the late precambrian B graywacke of Mufulira,Zambia

Matrix-rich samples of the Mufulira B graywacke contain discrete grains of bornite of detrital origin, and bornite-bearing rock fragments of igneous, plutonic composition. This finding is consistent with previous reports of copper sulphide concentrations in sedimentary structures of arenites, and poses the question of the relative role of clastic sedimentation as an ore-forming process in the Zambian Copperbelt.