THE ROCK-DUST CARTRIDGE METHOD OF STEMMING SHOTS
Fifty per cent. increased lump coal production and at the same time a reduction of from 20 to 40 per cent. in explosive consumption. These results were achieved by the use of the rock-dust cartridge method of stemming shots in the Ruhr coal mines, as announced by Dr. Alfred Stettbacher in the September 1923 number of the Explosive Engineer.
cartridge, coal mines, dust, rock, Coal, Coal mine, coal mines, Engineers, Explosion, Explosives, Pressure, Reduction, test, Tests