Author:Raab, GADate:1973The effects of mechanisation in coal mining were investigated by the NCB Scientific Department and some data were published in "second Symposium on Coal Preparation" 21st to 25th October, 1957, University of Leeds.Read more
Author:Raab, GADate:1972At Tweefontein United Collieries Limited, coal is won from No. 2 and No. 4 seams. The coal is hand-loaded underground into tube and arrives at the tipplers via the Western shaft and the Klipplaat shaft.Read more
Author:Raab, GADate:1973Anthracite mined from four sections of the seam and hand-loaded into tubs arrives at the surface via the haulage adit. The total discard amounts to approximately 23 to 24 per cent, 3 to 4 per cent of which arrives from the picking belt. leaving ...Read more