Canadian mining journal January-June 1905 . lized for widths which vary from a fraction of an inch totight or nine inches; there are some wider crevices (a series ofseams sometimes extending to a width of nearly six feet) butthe filling is chiefly rock matter, the smaltite and niccoliterarely having a greater width than three to four inches. Pro-fessor W. R. Miller has more specifically described the igneousrocks as breccia-conglomerate and agglomerate with which areinterpolated bands of a silicious rock called by Sir WilliamLogan,Huronian Slate. His term slate was applied to arock which is re
Canadian mining journal January-June 1905 . lized for widths which vary from a fraction of an inch totight or nine inches; there are some wider crevices (a series ofseams sometimes extending to a width of nearly six feet) butthe filling is chiefly rock matter, the smaltite and niccoliterarely having a greater width than three to four inches. Pro-fessor W. R. Miller has more specifically described the igneousrocks as breccia-conglomerate and agglomerate with which areinterpolated bands of a silicious rock called by Sir WilliamLogan,Huronian Slate. His term slate was applied to arock which is really composed of minute grains and fragmentsof rocks of various kinds which have been consolidated andmore or less altered; they are fine grained and delicately lam-inated rocks, but they are not argillites, on the contrary, theyare decidedly silicious. Professor Miller, who has carefully and the extinction of the east and west running seems very |clearly shown. This extinction is often marked by a wall which is curvedrather than View of Big Open Cut at Wright;Mine. studied this region and made many sections, says that theseries of slates represent ash rocks in which are found frag-ments of orthoclase, plagioclase, trachyte, chlorite and calcite. The fractures by which the veins have been formed seemto have been due to two forces acting in directions inclined toeach other at angles varying from 120 to 160 degrees. Inmany cases the minor fracture has become obliterated. Thediminution of the secondary fracture is shown in the accom-panying photo of the Wright Mine, 269, where the convergencein depth, of the two lines, marked A and B, is most noticeable. The very high values which have been realized from thesjores have attracted much attention from capitalists andminers. The available area of Coleman Township has beenblanketed with locations, but many are to be investigated be-fore the commission, and will probably be located. (To be continued.) THE KINGSTON SCHOOL OF M
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