The first considerable production of tungsten from the Canadian Shield came from the Hollinger Gold Mine. Scheelite concentrates of exceptionally high grade and purity were milled from localized concentrations of this mineral in the quartz-ankerite and tourmaline-quartz-ankerite veins, which account also for most of the gold production. The position of the scheelite ore in these veins points to a genetic or structural dependence of the vein mineralization on the intrusive quartz porphyries.

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