Some Tertiary Rocks and Mineralization of the Tonopah District — Interpretations and Reinterpretations

  • Larry J. Garside
  • Published 2010


Stop 1. Mizpah Formation. Old Powder House. [38.07997, -117.22496; NAD83] Exposures of plagioclase-hornblende-pyroxene-biotite trachyandesite to dacite lavas and breccias are found along the road here. The Mizpah Formation is the major ore host in the Tonopah District. The large equant plagioclase are distinctive, even in strongly hydrothermally altered… (More)


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