The pyritic ores of this area are believed to be of hydrothermal origin. They represent the mineralization by hydrothermal solutions of the sheared and brecciated incompetent layer lying between the competent acid volcanic footwall and the basic volcanic hangingwall. Evidence for these relationships is to be found in the origin of the ottrelite schist of the footwall and in the shearing and veining of the hangingwall. These events preceded the emplacement of the Algoma granite from which the mineralizing solutions are believed to come.

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