Journal - South African Institute of Mining and Metallurgy . 500 ft. of ro if was from2 to 8 of the height tion, dry culm * having the least and wet culm having tl s aent. Experiments could be made on tail-pipes with a hydraulic press or other ngetting -ire. T suggest that the engineer- _• partirent of the Government Laboratoryexperiment a little in order to give us some dataon this. I guess safety measures have as greatan interest for them a- for any of us. and they have the means for making experiments. Th> Journal of The Chemical, Metallurgical and Mining Society of South Africa. March 1
Journal - South African Institute of Mining and Metallurgy . 500 ft. of ro if was from2 to 8 of the height tion, dry culm * having the least and wet culm having tl s aent. Experiments could be made on tail-pipes with a hydraulic press or other ngetting -ire. T suggest that the engineer- _• partirent of the Government Laboratoryexperiment a little in order to give us some dataon this. I guess safety measures have as greatan interest for them a- for any of us. and they have the means for making experiments. Th> Journal of The Chemical, Metallurgical and Mining Society of South Africa. March 1908 A- to the cost of pumping the water back, such places a< the K flights Deep could furnish estimatesof cost of handling large quantities. It might be troublesome handling this water where the minewater i- not tit to mix with the reduction workswater. As t the manner of carrying stopes, with a dipup to about 40° I like to see the faces of benchesbearing away about .30° from the direction of fulldip (Fig. I.), greater in flatter stopes. The. DR/i/E tn;. L—Part of stope-face showing run of benches 30 from the direction of full dip. I>i]> 15 t -in . The machines are ed until t hi- four benches are drilled, and then leturned to No. 1 bench. benches should be broken from the bottom of the stope upwards, instead of downwards as mostminers prefer to do: in working upwards thenext bench above is lengthened, which is anadvantage as it gives room tor the explosives to kickbeyond the bottom of the holes: in steep stopes theangle of the fares from the direction of full dipwould be less (see Fig. II.). Stoping would becomemore underhand in mines, where it was not advis-able to have a large amount of broken ore in thestopes (Fig. 11.); but in a mine where the brokenore could lie left so as to work on it (Fig. III.),then it would be cheaper to allow the stoping tobecome more overhand as the dip became greater.,\s more machines could be got to work comfort-ably, time would be
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Keywords: ., bookcentury1800, booksubjectmetall, booksubjectmineralindustries
