. Ontario Sessional Papers, 1914, nized, since the assays of shipments of high-grade ore show a higher pro-portion of silver than gold, which is not accounted for in the recovery of silver byamalgamation in the stamp mill of the Tough-Oakes mine. 24 Bureau of Mines No. 4 There have been different movements in the veins, resulting in repeated circula-tion of gold-bearing solutions with deposition of the gold in the fractures. Nativegold has been observed in various constituents of the vein, namely, in the glassywhite quartz; in the cleavage planes of calcite; in a group of minerals like
. Ontario Sessional Papers, 1914, nized, since the assays of shipments of high-grade ore show a higher pro-portion of silver than gold, which is not accounted for in the recovery of silver byamalgamation in the stamp mill of the Tough-Oakes mine. 24 Bureau of Mines No. 4 There have been different movements in the veins, resulting in repeated circula-tion of gold-bearing solutions with deposition of the gold in the fractures. Nativegold has been observed in various constituents of the vein, namely, in the glassywhite quartz; in the cleavage planes of calcite; in a group of minerals like quartz,albite and carbonates. The gold is usually associated with some of the sulphides, likepyrite, molybdenite and copper pyrites, and tellurides like altaite. Microscopic Examination of Ore An examination of a number of thin sections of ore from the Kirkland Lake areashows that the vein material has been much brecciated. Fragments of coarsely crystal-line white quartz are often surrounded by secondary minerals. Gold has been observed. i: Thin section of }jo!d=bearing- quartz from No. 2 vein, Toujjh=Oakes mine. Quartz has been replaced by carbonate. Black spots are native gold. \ 19 diameters. in contact with altaite, molybdenite and iron pyrites. In one case an isolated grainof gold incased a grain of telluride. Fragments of greywacke or porphyry are sur-rounded by vein minerals. One section shows the quartz greatly fractured and aninterlacing meshwork of metallic minerals occurs in the fractures. The crystallizedcalcite frequently contains gold which has followed along the rhombic cleavage clusters of dark minerals, sulphides, tellurides and gold, occur throughout thecrushed vein material, while similar minerals sometimes concentrate along the marginsof included fragments like bits of greywacke or comglomerate. Carbonate veinlets fre-quently cut through the quartz and included fragments of rock. 1914 The Kirkland Lake and Swastika Gold Areas 25 Development Tou
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