Adapting Duckbills to Entry Driving at Greenhill Mine

THE Greenhill mine of West Canadian Collieries, Limited, is on the Alberta side of the Crowsnest pass, twelve miles from the Alberta-British Columbia boundary-line. Here, five coal seams of Lower Cretaceous age are found in the Kootenay formation. They outcrop on the north and south slopes of the valley, with strike approximately N.30°W., paralleling the main range of the Rocky mountains, and dip about 40 deg. westward.
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