File:ONTARIO SESSIONAL PAPERS, 1915, No.3-4 (1915) (14762795304).jpg

Identifier: n02ontariosessional47ontauoft (find matches)
Title: ONTARIO SESSIONAL PAPERS, 1915, No.3-4
Year: 1915 (1910s)
Authors: ONTARIO. LEGISLATIVE ASSEMBLY
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Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: Ontario Council of University Libraries and Member Libraries

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t disturbed alike rocks of Algoman, Animikean and Keweenawan age. Prob-ably the great fault which runs eastward and westward of Pakowkami lake, and whichwas mentioned by Logan, belongs to this class. Doubtless there are other systems offissures than the four to which reference is here briefly made. MINERALS AND MINES ON THE NORTH SHORE OF LAKE HURON In the autumn of 1914, the only mining operations that were being carried onwere at the quartz quarry near Killarney (Fig. 8). Consequently the notes givenbelow must refer almost wholly to properties which were then inactive. Of these,the old Bruce copper mines have had most time and money spent on them. Theirimportance many years ago is shown by the fact that prior to 1875 they constitutedone of the worlds great copper mines. A list of the minerals and other materials which are of interest on the north shoreof Lake Huron may be given as follows: copper, gold, silver, cobaltite, native bismuth,quartz, trap rock, marble and building stones.
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Fig-. 8—Uuartz, quarry near Killarney on the north shore of Lake Huron. The yuartz is used for making: ferro=silicon Copper The most widely known deposits of copper on the north shore of Lake Huronoccur at Bruce Mines, about 35 miles east of Sault Ste. Marie. Below will be founda description of the veins and workings. In addition to the Bruce Mines, similardeposits occur at various places in the surrounding area, a few of which were visited.It may be pointed out that these deposits diifer radically in their mode of formationfrom the nickle-copper ore bodies at ISudbury. A. P. Coleman believes that the latteroccurrences were formed mainly by magmatic segregation in a basic rock called norite,while the former are quartz veins carrying copper pyrites. These veins vary in sizefrom small stringers to strong veins having a width of 50 feet, but the main vein at BruceMines on which most work was done has an average width of about five and a halffeet. 1915 The North Shore of Lake Huron 231

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