Ontario Sessional Papers, 1913, . Mixed Quartz and Schist, 45-foot Mine, Porcupine, Ont. Copj-right, Canada 1013,by Artluir A. Cole. 14 T. AXD X. 0. Xo. 70. -_ c o o o o 5 O o o o o o o O o 0 0 o o IS o O o o o o o o O o o ^ —p —^— 9r —iO— ;9 -^ —p, —f^— , \\ // , f ,; [ \ 1 ? *^ /, // , ( ;l \\ , \N ,/ / ,1 1, \. 1 n \^ ,^ / i \\ ; > \\ /> , 1 1> \. \> i f, I \ II ,..^= -.,.^ -^?^ DRILLING DOMC r ?f//V£ Methods ot Drift and Shaft Mine, Porcupine, Ont. 1913 MIXIXG EXGIXEEirS IJEPOirr. 15 Ijmvc liwii sunk, Xo. ] to lUl) ainl Xo. l to
Ontario Sessional Papers, 1913, . Mixed Quartz and Schist, 45-foot Mine, Porcupine, Ont. Copj-right, Canada 1013,by Artluir A. Cole. 14 T. AXD X. 0. Xo. 70. -_ c o o o o 5 O o o o o o o O o 0 0 o o IS o O o o o o o o O o o ^ —p —^— 9r —iO— ;9 -^ —p, —f^— , \\ // , f ,; [ \ 1 ? *^ /, // , ( ;l \\ , \N ,/ / ,1 1, \. 1 n \^ ,^ / i \\ ; > \\ /> , 1 1> \. \> i f, I \ II ,..^= -.,.^ -^?^ DRILLING DOMC r ?f//V£ Methods ot Drift and Shaft Mine, Porcupine, Ont. 1913 MIXIXG EXGIXEEirS IJEPOirr. 15 Ijmvc liwii sunk, Xo. ] to lUl) ainl Xo. l to tioO ft. Sinking of Xo. -^ to be i-otnimied. A double tniiked mcliiio o(iH ft. long roniHHds tbe 45 ft. :uulthe lUO ft. levels with the surface, and the mill. From the surface to the 15 the grade is per cent., and from the 45 ft. level to the 100 ft. level, per cent. The 45 ft. level was divided into 100 ft. rectangular blocks of ore by driftsand crosscuts. A nuniher of raises were then run to the surface with a chute atthe foot of each, ihe ore which was broken down from above in benches wasdrawn off thiough these chutes, tramm
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Keywords: ., bookauthorontariol, bookcentury1900, bookdecade1910, bookyear1913
