Raising a Blind Shaft Between Two Submarine Coal Seams

PART of the plan of re-allocation evolved by the engineers of the Dominion Steel and Coal Corporation in 1932 to retard the rapid advance of the submarine workings seawards was t.lie opening of Dominion No. 20 Colliery, in the Harbour seam, by a pair of cross-measure tunnels from the workings of an older mine working the Phelan seam, which lies 430 feet below the Harbour seam.
Keywords: Air, air current, hardwood, I-beam, rock, shaft, Chutes, Operation, Raising, Rock, Rocks, Shafts, steel, Steels
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