. Bulletin of the Geological Society of America. Geology. STRUCTURAL RELATIONS OF THE ORE BODIES. lo3 schistose diorites and a brecciated condition of the gneiss and quartz-syenite. The Evans mine appears to be connected with a continuation of this break. A number of more or less promising occurrences of the mixed ore have been found in the two southern ranges of Denison, in Louise, Lome, Nairn, Baldwin, Drury and Hyraan, and further north in Neelon and McKim. All. Figure I—Section of brecciated Ore from Murray Mine. these are associated with diorite. In some instances they have been found to
. Bulletin of the Geological Society of America. Geology. STRUCTURAL RELATIONS OF THE ORE BODIES. lo3 schistose diorites and a brecciated condition of the gneiss and quartz-syenite. The Evans mine appears to be connected with a continuation of this break. A number of more or less promising occurrences of the mixed ore have been found in the two southern ranges of Denison, in Louise, Lome, Nairn, Baldwin, Drury and Hyraan, and further north in Neelon and McKim. All. Figure I—Section of brecciated Ore from Murray Mine. these are associated with diorite. In some instances they have been found to be connected with lines of fracture, and this may prove to be so in all cases. The discoveries of the ore which have been made to the west of Lake Wahnapitse are also in diorite in the vicinity of quartz-syenite. Mode of Occurrence of the Ores. The various occurrences of the mixed nickeliferous pyrrhotite and chal- copyrite, as far as they have yet been opened up, all resemble each other so closely that a description of one will apply to all. They are associated primarily with the diorite masses which conform more or less nearly with the general strike of the other rocks of the country. The older lines of frac- ture or disturbance are also approximately parallel with the strike, but their planes may incline at different angles from the local dip. The ore-bodies take the form of stock-works, following the direction of these ancient faults. Tiie bodies are made up of a mixture of the country rock and the sulphides in the shape of a confused mass of coarse and fine fragments of the former, while the ore itself constitutes the matrix or filling between them. The frag- XX—Bum,. Gkol. Soc. Am., Voi,. 2, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Societ
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