Author : Geological Survey of Canada
Publisher : Unknown
Page : 212 pages
File Size : 45,8 Mb
Release : 2015-07-04
Category : Science
ISBN : 1330679407
Mineral Resources of Canada Bulletin, 1904 (Classic Reprint) by Geological Survey of Canada Pdf
Excerpt from Mineral Resources of Canada Bulletin, 1904 The occurrence of mica in large and important deposits, at several points in eastern Canada, was recognized by the officers of the Geological Survey, almost from the commencement of the study of the crystalline rocks, and several references to this mineral are found in the earliest reports of the department. The true economic value of the mica deposits was not however ascertained until a comparatively recent date. Its intimate association with apatite at many places was disclosed during the working of the latter deposits many years ago, but down to within the last fifteen years the mica was regarded practically of but small importance, and the quantity necessarily extracted in the removal of the apatite was thrown out on the dump. Around many of the old apatite mines, even at the present day, large quantities of this mineral, now rendered useless from long exposure to the weather, can be seen. Generally speaking it may be said that mica came into marked prominence owing to the discovery of its fitness as an adjunct in the manufacture of dynamos and other electrical appliances, and as a consequence not only were many of the old mines, which were worked for apatite up to the decline of the market for that mineral some years ago, and in which mica was known to occur in considerable quantity, reopened, but its presence was soon ascertained in other portions of the crystalline rocks which had hitherto been unexplored. Many of the properties thus taken up as probably mica-bearing were soon abandoned, owing doubtless to the limited extent of the deposits in some cases, or to the inferior quality of the mica in others, but some of these have been developed into large and profitable mines which have been worked almost continuously for many years. Practically, at the present time, all the mica mining in Canada is confined to the provinces of Ontario and Quebec, with the exception of an, area found in the Rocky mountains near Tete Jaune Cache, B. 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."
