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Click on geological units on the map for more information.

Click here to view full-screen map on Age: Cenozoic (0.0117 - 5.333 Ma)Description: Unit consists mostly of older alluvium and alluvial fans.

The deposits are all related to a large volcanic center (caldera complex) called the Mc Dermitt caldera complex.

Mines in the Opalite district include those listed below. Oregon Department of Geology and Mineral Industries. (1960) The geology of the Cordero quicksilver mine area, Humboldt County, Nevada.

The Mc Dermitt mine was the last operating primary mercury production mine in the USA when it ceased operations in 1990.

Fragments are nearly always angular, suggesting the source material was unconsolidated pyroclastic debris rather than eroded consolidated rock layers.

The parent rock is pyroclastic, with angular fragments of peralkaline rhyolite that contains alkali feldspar phenocrysts, sometimes several centimeters long or larger.

After the main tuff eruption, the volcanic source chamber collapsed to form an oval surface depression called a caldera. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

The Mc Dermitt caldera measures 25 miles (40 km) north-south by 14 miles (22 km) to 19 miles (30 km) east-west. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States.