In the Monitor district, are small irregular gold-silver deposits, in which huebnerite is present along with minerals characteristic of the epithermal zone. The gangue is chiefly quartz and rhodochrosite. The paragenesis of the huebnerite indicates that it was deposited quite late. The enclosing Miocene lavas and breccias were extensively altered by hydrothermal solutions and, due to weathering, are vividly colored. The altered rocks are overlain by relatively fresh Pliocene volcanics. The mineralization and other geological features are similar to those accompanying many other bonanza-type gold-silver deposits in the Great Basin region.

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