Adapting Duckbills to Entry Driving at Greenhill Mine

CIM Bulletin1947
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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