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Virgin Valley District, Virgin Valley, Humboldt Co., Nevada, USA

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Latitude & Longitude (WGS84): 41° 50' 39'' North , 119° 0' 38'' West
Latitude & Longitude (decimal): 41.84417,-119.01056
Köppen climate type:Dsb : Warm, dry-summer continental climate

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Mineral List

Mineral list contains entries from the region specified including sub-localities

23 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Holocene - Pleistocene
0 - 2.588 Ma

ID: 2787321
Alluvium, undifferentiated

Age: Pleistocene (0 - 2.588 Ma)

Description: Unit is present in all counties. Some counties divided the alluvium into younger and older units, and some did not. For those that did not, or used other generalized terms for Quaternary rocks, the unit Qal has been used for the general undivided alluvium. Additionally, when polygons have been edited and changed to alluvium, Qal was used as the general value; hence it now is present in all counties. Qya-Younger alluvium: Map unit is used in Churchill, Elko, Esmeralda, Eureka, Humboldt, Lander, and Lincoln Counties where geologic information suggests better-defined younger versus older alluvium. It is mostly interchangeable with Qal, except that it implies some specifically younger Quaternary deposits.

Lithology: Major:{coarse alluvium,fine alluvium}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

2.588 - 23.03 Ma

ID: 3186305
Cenozoic volcanic rocks

Age: Neogene (2.588 - 23.03 Ma)

Stratigraphic Name: Columbia River Basalt

Comments: Columbia Plateau

Lithology: Flood basalt(s); mafic volcanic rocks; basalt

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

Localities in this Region

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. 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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Statz, M. H. and H. L. Bauer Jr. (1951) Virgin Valley opal district, Humboldt County, Nevada. USGS Circular 142.
Castor, Stephen B., Christopher D. Henry, Lisa A. Shevenell (1996), Nevada Bureau of Mines and Geology, Open-File Report 96-3.
Nevada Bureau of Mines and Geology, Minerals of Nevada, Special Publication 31.
Nevada Bureau of Mines and Geology files No. 50600003.

External Links - Info about Virgin Valley Opal Mining District on

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