The overlying sandstones afford good building stones, and frequently, as at Vereeniging, yield many fossil plants.
The principal collieries are those at Boksburg and at Brakpan, also on the East Rand, with a coal area of 2400 acres; at Vereeniging and Klerksdorp, near the Vaal; at Watervaal, 12 m.
First the country east of the line Bloemfontein-Vereeniging was swept four times over, then the method was employed in the Transvaal, east and west, and finally against the Cape rebels.
The scheme recommended by the Zuider Zee Vereeniging (1886) formed the subject of a report in 1894 by a state commission.
At Kronstad, &c., in Cape Colony, at Vereeniging, Boksburg and elsewhere in the Transvaal, in Natal and in Swaziland.