The veins of the Polaris mine of the Coeur d'Alene mining district are of hydrothermal origin, formed at intermediate temperatures and depths. The mineralogy and paragenesis are discussed. The occurrence of gersdorffite, a mineral not previously recognized in the ore of the " Silver Belt," is established. The evidence suggests that the vein minerals were deposited in a rather definite and non-recurrent but interrupted sequence. Structural adjustments concurrent with the mineralization controlled the localization of ore.

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