. Transactions of the Institution of Mining Engineers . Fig. 6.—Steam-shovel at Work. 1921-1922.] SHEPPARD COAL-MINING BY STEAM-SHOVEL IN ALBERTA. 329 Blackstone No. 6 Mine (Figs. 3, 9, and 10).—The geological con-ditions at Blackstone No. 6 Mine are very similar to those at No. 1, theseam occurring on the crest of a fold. In this case, however, a sand-stone layer about 10 feet in thickness forms the overburden. To theeast of the exposure a deep coulee (or short tributary to the LittlePembina River) has excavated a valley, thereby exposing the coal-seam. Operations were started from this point
. Transactions of the Institution of Mining Engineers . Fig. 6.—Steam-shovel at Work. 1921-1922.] SHEPPARD COAL-MINING BY STEAM-SHOVEL IN ALBERTA. 329 Blackstone No. 6 Mine (Figs. 3, 9, and 10).—The geological con-ditions at Blackstone No. 6 Mine are very similar to those at No. 1, theseam occurring on the crest of a fold. In this case, however, a sand-stone layer about 10 feet in thickness forms the overburden. To theeast of the exposure a deep coulee (or short tributary to the LittlePembina River) has excavated a valley, thereby exposing the coal-seam. Operations were started from this point, and so the face was. Fig. 7.—Loosening the Top Face of the Coal.
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
