The Mining industry in Quebec . ens, these porphyritic rocks are always of a lightcolour, varying between yellowish, reddish and greenish are sometimes intersected by dykelets of white quartz, some-times by stringers of reddish feldspar. Phenocrysts of quartz andfeldspar are discerned in a matrix of uniform, very fine-grainedtexture. In a single place, near the northern line of the Caine claim,Block N., in the cleared area around the Federal Zinc and LeadCompanys mine, we found a coarser variety of these phenocrysts of orthoclase are as much as an inch in length andar
The Mining industry in Quebec . ens, these porphyritic rocks are always of a lightcolour, varying between yellowish, reddish and greenish are sometimes intersected by dykelets of white quartz, some-times by stringers of reddish feldspar. Phenocrysts of quartz andfeldspar are discerned in a matrix of uniform, very fine-grainedtexture. In a single place, near the northern line of the Caine claim,Block N., in the cleared area around the Federal Zinc and LeadCompanys mine, we found a coarser variety of these phenocrysts of orthoclase are as much as an inch in length andare more numerous than the quartz ones which are not so feldspar was cut by a quartz vein 2 inches wide containingsome small grains of galena and zinc-blende. As seen under the microscope, the fine grained matrix of the rockconsists solely of aggregates of quartz and orthoclase feldspar andwe have classified these rocks as granite-phorphyries. The origin ofthe metalliferous veins of the district is probably connected with. III. —Shafl house and boiler plant of tin- Federal Zinc and 1 ead Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
