Economic Geology and the Bulletin of the Society of Economic Geologists vol:102 issue:7 pages:1321-1333
The Dikulushi Cu-Ag deposit is located in the Kundelungu Plateau region in the southeast Katanga province of the Democratic Republic of Congo. The Kundelungu Plateau is a triangular-shaped area to the north of the Lufilian arc, which contains part of the Central African copperbelt, the largest known sediment-hosted copper province in the world. The Lufilian arc and the Kundelungu Plateau comprise Neoproterozoic sedimentary rocks of the Katanga Supergroup that attain an overall thickness of more than 7,000 m. The Lufilian orogeny imposed a northeast-directed shortening on the Kundelungu Plateau region, forming several gentle, northwest-oriented anticlines above subparallel detachment surfaces at depth. A north-northwest-oriented thrust is exposed in the western part of the Dikulushi mine, marked by ductile deformed shale that was transported upward and is in faulted contact with an overlying dolomite-sandstone sequence. This upward emplacement of the shale caused brecciation and the local development of kink folds in the dolomite-sandstone sequence. The brecciated layers in the west and nonbrecciated sandstone layers in the central part of the mine are crosscut by several east-west- and northeast-oriented faults. This complex set of faults produced a damage zone that was a Favorable site for the migration of mineralizing fluids. The faults and brecciated layers contain Cu-Pb-Zn-Fe mineralization consisting of chalcopyrite, bornite, and chalcocite, with minor pyrite, arsenopyrite, sphalerite, and galena, with dolomite, calcite, and quartz as gangue minerals.