| Witwatersrand Basin |
Situated in the heartland of the South African gold mining industry. Within the basin, a great area of gold-bearing reefs stretches from forty miles east of Johannesburg to ninety miles west, then swings south-west into the Orange Free State.
Cutaway of the multi-layered
gold bearing reefs of the Witwatersrand
| 1 | Ventersdorp Contract Reef |
| 2 | Mondeor Conglomerate formation |
| 3 | Kimberly Conglomerate formation |
| 4 | Bird Conglomerate formation |
| 5 | Livingstone Conglomerate formation |
| 6 | Johnstone Conglomerate formation |
| 7 | Main Conglomerate formation |
| 8 | Crown Formation |
| 9 | Veldschoen Reef (inner basin reef) |
| 10 | Magnetic Horizon in in lower Jeppestown shale |
| 11 | Buffelsdoorn (Outer Basin reef) |
| 12 | Boulders Reef |
| 13 | Magnetic shale in Witport Jie Formation |
| 14 | Magnetic West Rand shales |
| 15 | Rietfontein tillite |
(Credit: courtesy The Chamber of Mines of South Africa)