Annual report . Canadian Sulphur Ore Companys workings. The brecclatlon, which was 94 Bureau of Mines No. 4 probably caused by the intrusion of the trap dikes, may have assisted in the circulationof the iron and sulphur solutions. On lot 10, in the tenth concession of Madoc township, are five small garnetiferousschist areas surrounded by felsite, which suggest that the felsite may be a sill of whichthe present surface represents the top or bottom of the sill. The true structure may bedetermined by further development work. Basic Dikes.—Narrow dikes of altered diabase, up to 40 feet in width, a
Annual report . Canadian Sulphur Ore Companys workings. The brecclatlon, which was 94 Bureau of Mines No. 4 probably caused by the intrusion of the trap dikes, may have assisted in the circulationof the iron and sulphur solutions. On lot 10, in the tenth concession of Madoc township, are five small garnetiferousschist areas surrounded by felsite, which suggest that the felsite may be a sill of whichthe present surface represents the top or bottom of the sill. The true structure may bedetermined by further development work. Basic Dikes.—Narrow dikes of altered diabase, up to 40 feet in width, are the youngestpre-Cambrian rocks in the Queensboro area. They consist essentially of hornblende withsmall amounts of plagioclase and biotite. The secondary minerals are sericite andchlorite. Much magnetite is present. The diabasic ttxture can frequently be seen bothmegascopically and microscopically. The dikes have been somewhat fractured, the smallfissures being filled with chalcopyrite, quartz and I i«\ 46. -Gossan at pit No. 4, Canadian Sulphur Ore Compan>. (jueensboro BLACK RIVER LIMESTONE One small remnant of Black River limestone and sandstone, a few feet in thickness,lies unconformably on the crystalline limestone of Grenville age. The Black Riverlimestone resembles the lithographic type, but is impure, due to numerous quartzgrains being scattered through it. GLACIAL AND RECENT The direction from which the ice movement took place, as shown by the striae whichare well preserved on the hard felsite, is about 30 degrees east of north. Deposits of gravel, sand, clay and some marl cover a large area, containing finefarming and grazing land. 1913 The Pre=Cambrian (jeolojjy of Southeastern Ontario 95 Gossan The gossan, Fig. 46, forms the upper part of the pyrites-bearing deposit, due to thepyrites readily oxidizing. It is dark brown in color, somewhat porous in texture, andcomparatively light in weight. One sample on analysis gave per cent, iron and
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
