The Mining industry in Quebec . III. —Shafl house and boiler plant of tin- Federal Zinc and 1 ead Plate l\ .- Bre< i i i in rushed mineralized zone in mine <»i I ederal Zinc and Lead THE PROVINCE OF QUEBEC 133 their intrusion. Their overflow probably occurred subsequently tothe settling of the other eruptive rocks of the region. All these eruptive rocks constitute a series of decreasing basicityfrom the basalts and diabases containing isolated quartz grains tothe granite porphyry with quartz as one of the rocks essential ele-ments. This fact leads us to suppose that all these rocks
The Mining industry in Quebec . III. —Shafl house and boiler plant of tin- Federal Zinc and 1 ead Plate l\ .- Bre< i i i in rushed mineralized zone in mine <»i I ederal Zinc and Lead THE PROVINCE OF QUEBEC 133 their intrusion. Their overflow probably occurred subsequently tothe settling of the other eruptive rocks of the region. All these eruptive rocks constitute a series of decreasing basicityfrom the basalts and diabases containing isolated quartz grains tothe granite porphyry with quartz as one of the rocks essential ele-ments. This fact leads us to suppose that all these rocks originatefrom the same deep-seated magma. The quartz veins would be thelast stage of the magmas igneous activity. Economic Features of the Deposits: Geographic Distribution.— The deposits of blende and galena, so far discovered in this re-gion, consist of some vens outcropping on the J. B. Caine, Gilker &Bois claims, Blocks A, D. and F. mined by the Federal Zinc andLead Company and on the Gossebn-LeBlanc claim, Block L, theproperty of the North America Mining Company. The gr
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
