File:ONTARIO SESSIONAL PAPERS, 1915, No.3-4 (1915) (14742180966).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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ent has shown blocks of ground in which the values aretoo low to be extracted profitably, but throughout the now^ extensive workings thereare large blocks of commercial ore which will be broken and treated in the mill. Thebest values are along the contact of quartz and schist, and visible gold is frequentlyobserved under these conditions. Some of the gold is very coarse in character, par-ticularly some of the surface showings which have now been mined. In the Golden>tair\vay vein streaks of gold had a thickness of about a quarter of an inch. Ironpyrites is abundant along the contacts, occurring in well crystallized forms contiguousto the veins. Galena and pyrrhotite are occasionally observed in the ore. The accom-panying photographs will illustrate the structures encountered in mining operations.Development has shown that some of the rocks are more favouralile for ore bodies thanothers. The conglomerate and greywacke of the Timiskaming series contain better 50 Bureau of Mines No. 4
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1915 The Porcupine Gold Area 51 deposits than the finely-banded slates which are not so open for percolation of solu-tions. The fine-grained amygdaloidal rocks are also not so favourable as the coarser-grained volcanics. The quartz-porphyry has not been proven to carry commercial orebodies. A dike of fresh diabase, about thirty feet in width, cuts the vein-bearing forma-tion to the west of the open pit. It has been encountered in the workings on the first andthird levels. This rock is much later in age than the mineralization of the schist. Theore bodies have a general northeast and southwest strike. In the deeper levels the workings are being laid out in a rectangular system withthe drifts northeast and southwest, and cross-cuts northwest and southeast. The following information is taken from C. D. Kaedings statement in the fourthannual report of the Dome Mines for the year ending March 31st, 1915: — During the year a total of 26.5,597 tons was mined and hoisted. Of this 248,550ton

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