The Great Dyke is a geological feature of great economic significance as it contains great quantities of chromite and PGMs. It is approximately 550 km long and up to 11 km wide, transecting central Zimbabwe in a north-north-easterly direction. Total estimated PGM Resources of the dyke, to a depth of 350 metres, are in excess of 2 000 million tonnes.
The geological setting of the PGM mineralisation in Zimbabwe is the Main Sulphide Zone of the Great Dyke, a large igneous intrusion which runs roughly north to south across the centre of Zimbabwe, over a distance of some 550 kms. The main economic concentrations of PGMs are found in three main complexes of the Great Dyke, known as the Selous, Selukwe and Wedza complexes.