The geology of the Muriton area has a number of significant features (C.H.E. Visser, 1996, Appendix 1), namely:

The area through which the Vaal and Orange Rivers flow has been subjected to an extended period of uplift and denudation, and processes of high-energy fluvial erosion and deposition have occurred since the Tertiary (post-Karoo) and Quaternary Periods. The rivers have not only removed a large part of the Karoo sedimentary sequence, but in their valleys also cut down deeply into the under1ying Archaean bedrock formations such as the Transvaal and Ventersdorp Supergroups. The bedrock geology in the Muirton area consists of a contact area between the soft Dwyka shales and hard Ventersdorp lavas which flow forms the ridge to the south; the quartz porphyry dyke mentioned in section 2.5 (above) has become most significant in the light of the geomagnetic surveys, the drilling work and the trial mining excavations carried out at Muirton.