Fuels of Western Canada and Their Efficient Utilization
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| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from Fuels of Western Canada and Their Efficient Utilization: Revised Edition, Read at the Second Professional Meeting of the Engineering Institute of Canada, Saskatoon, Sask;, August 8-10, 1918 Coal is, of course, much the most important fuel of Western Canada, and ranges from the lignite of the prairies to the semi-anthracite of the Rocky mountains. Thu Coal Fields and Coal Resources of Canada contains a statement of the coal resources of the Dominion. This statement of reserves is divided into two groups. Group I includes "coal in seams containing not less than one foot of merchantable coal occurring not more than 4,000 feet below the surface, including workable submarine areas." This group, Dr. Dowling states, includes the coal "of economic value contained in seams of workable thickness, situated within a mineable distance of the surface." Group II includes seams containing not less than two feet of merchantable coal occurring at depths between 4,000 and 6,000 feet. Such seams are situated beyond present mineable distance of the surface and have not been considered in this paper. Both groups are subdivided into (1) Actual Reserves, which includes cases in which the calculation of the amount was "based on a knowledge of the actual thickness and extent of the seams"; (2) Probable Reserves, which includes "cases in which an approximate estimate only" could be arrived at. At the present time, to be economically ´workable,´ a seam must be more than one foot thick, and no coal mine in Canada approaches 4,000 feet in depth, though, in the Crowsnest district, some workings have a ´cover´of several thousand feet. At great depths the greatly increased ventilation is a matter of expense and difficulty; ´creeps´ and subsidences of strata are unavoidable and either crush the coal or render it inaccessible; the capital and current expenditure of the mine grows in a higher proportion than the depths; the costs of raising water, coal, miners, etc., increase. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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