Raising a Blind Shaft Between Two Submarine Coal Seams

CIM Bulletin1944
MR. G. G. Bowser: Mr. Kalbhenn's paper is an excellent one and is a concise description of a very interesting piece of work. It is well known that a great deal of preliminary study was given to this job before the final plans were made. It is due to this thorough preparation .chat the work progressed so satisfactorily, smoothly, and safely.
Keywords: Accidents, blasting, Chutes, coal seam, cubic yard, hardwood, rock, shaft, Operation, Raises, Rock, Rocks, Shafts, Stone
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