Groenkloof Brick, Tile and Pottery Factory Ltd., Pretoria
Magista Slate Quarries, Ltd.
Vianini Ferro - Concrete Pipes (Brits.)
Imperial Chemical Industries
Rock Bursts
Low Grade Ore
Support of Workings
Government Miners Training Schools
The Refractory Ore Electrolythic Reduction Co. Ltd. SummertonPr
Assaying
