Mimosa is an on-going mining operation that comprises three ore bodies, namely North Hill, South Hill and Far South Hill. The three ore bodies have been explored, drilled, evaluated and converted to the various Mineral Resources and Mineral Reserves categories in accordance with best practice for the reporting of Mineral Resources and Mineral Reserves. A mineralized body; the Mtshingwe Fault Block, also occurs as a prospect between the South Hill and Far South Hill orebodies.
The main rock types are gabbroic rocks overlying an ultramafic unit of repetitive cycles of pyroxenite, dunite and chromitite rocks. Economic minerals comprising platinum group metals and base metals are fornd within the Main Sulphide Zone (MSZ) which is located in pyroxenite, some 5m to 20m below gabbroic rocks. Platinum, palladium, rhodium, iridium and ruthenium along with gold, copper, cobalt and nickel occur in economic quantities within the MSZ. The layered units are basin shaped with layers shallowly dipping towards the axis of the basin flattening at the bottom.