Field observations, drillhole logging and lithogeochemical data are integrated into a general model for the initial stratigraphic sequence and location of the mineralization on the flank of a small rhyolite dome which shed coarse felsic breccias (with mafic debris derived from a separate source area). Sulfides accumulated at the end of a tholeiitic phase of felsic volcanism, and were followed by mildly calc-alkaline felsic volcanism.

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