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Cinnabar City Mine (King George Mine), Spring Valley District, Humboldt Range, Pershing Co., Nevada, USAi
Regional Level Types
Cinnabar City Mine (King George Mine)Mine
Spring Valley DistrictMining District
Humboldt RangeMountain Range
Pershing Co.County

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Lock Map
Latitude & Longitude (WGS84):
40° 18' 46'' North , 118° 5' 49'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
Humboldt119 (2011)34.8km
Lovelock1,878 (2017)35.2km
Imlay171 (2011)38.9km

Sec 1 T28N R34E

The Cinnabar City mine was a relatively small producer but is noted for very coarse cinnabar. To refer to this place as a "City", in any sense of the word, suggests delusions of grandeur. The mine is located near the head, the southern end, of a small, north-south oriented canyon. It is approximately 3 miles northeast of the large open pit silver - gold mine centered on Nenzel Hill that was begun by Coeur Rochester in 1986. It is one of a number of mercury mines that dot the periphery of the Rochester District.

At Cinnabar City the bedrock is folded Triassic age limestone that dips east. The ridge on the east side of the canyon is capped by Pliocene age basaltic tuff and basalt flows. The limestone immediately underlying the tuff is a rubbly breccia with tuff in the interstices.

The limestone country rock is transected by high angle calcite veins. The small orebody worked by the Cinnabar City mine is located where one of these calcite veins is truncated by the contact with the overlying tuff. Although the calcite vein does not extend into then tuff and basalt, sparse cinnabar does occur in the tuff above the ore shoot. This suggests that deposition occurred in a very shallow hot spring environment. For the most part deposition immediately preceded the eruption of the basaltic tuff and flows but the waning stages continued after deposition of the tuff. Therefore, mineralization is no older than Pliocene.

Ore came from a single stope and seems to have been very high grade containing very coarse masses of cinnabar in calcite. Production totaled less than 350 flasks.

In October, 1975, when this author visited the locality there were a number of small buildings still standing (site photo) and the mill, up on the hillside, was mostly intact. In some recent photographs seen on the internet the buildings are now gone and the mill is a badly shattered ruin. The red Federal Motor Company truck is still visible in the recent photo's. It appears more faded than 40 years ago and I suspect there are more bullet holes than there were then.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

6 valid minerals.

Detailed Mineral List:

Formula: CaCO3
Reference: NBMG Bull 89 Geology and Mineral Resources of Pershing County, Nevada
Formula: (Hg2)2+Cl2
Reference: NBMG Bull 89 Geology and Mineral Resources of Pershing County, Nevada
Formula: HgS
Reference: NBMG Bull 89 Geology and Mineral Resources of Pershing County, Nevada
Formula: Hg
Reference: NBMG Bull 89 Geology and Mineral Resources of Pershing County, Nevada
Formula: SiO2
Reference: NBMG Bull 89 Geology and Mineral Resources of Pershing County, Nevada
Formula: Sb2S3
Reference: NBMG Bull 89 Geology and Mineral Resources of Pershing County, Nevada

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Group 2 - Sulphides and Sulfosalts
Group 3 - Halides
Group 4 - Oxides and Hydroxides
Group 5 - Nitrates and Carbonates

List of minerals arranged by Dana 8th Edition classification

Metals, other than the Platinum Group
Group 2 - SULFIDES
AmXp, with m:p = 1:1
AmBnXp, with (m+n):p = 2:3
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si

List of minerals for each chemical element

C CalciteCaCO3
O CalciteCaCO3
O QuartzSiO2
Si QuartzSiO2
S CinnabarHgS
S StibniteSb2S3
Cl Calomel(Hg2)2+Cl2
Ca CalciteCaCO3
Sb StibniteSb2S3
Hg CinnabarHgS
Hg Calomel(Hg2)2+Cl2
Hg MercuryHg

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

201.3 - 251.902 Ma

ID: 3184762
Mesozoic sedimentary rocks

Age: Triassic (201.3 - 251.902 Ma)

Lithology: Sedimentary rocks

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]

Carnian - Olenekian
227 - 251.2 Ma

ID: 2832815
Humboldt Assemblage - Limestone, dolomite, shale, sandstone, and conglomerate

Age: Triassic (227 - 251.2 Ma)

Stratigraphic Name: Star Peak Group

Description: Unit consists of the Star Peak Group which lies depositionally on the volcanic and volcaniclastic rocks of the Koipato Group (TRkv). Map unit includes rocks mapped as Cane Spring, Natchez Pass, Prida, Augusta Mountain, Congress Canyon, Fossil Hill, Favret, Dixie Valley, and Tobin Formations, including Smelser Pass, Panther Canyon, and Home Station Members of the Augusta Mountain Formation. Basaltic flows and volcanic breccias (TRvm) are present in the Humboldt and northern Stillwater Ranges within the Smelser Pass Member of the Augusta Mountain Formation. The Star Peak Group includes carbonate platform deposits and grades westward into slope and basin paleogeographic environments. Complex stratigraphic patterns of carbonate and terrigenous rocks in the lower part of the group result from localized relative uplift. Widespread diagenetic secondary dolomitization of calcareous rocks complicates the stratigraphic patterns (Nichols and Silberling, 1977b). There is a major unconformity within the Star Peak Group underneath the Panther Canyon Member, which is late Ladinian (late Middle Triassic) in age. The Panther Canyon Member rests in places directly on the noncarbonate rocks of either the Koipato Group (TRkv) or the Golconda terrane (GC), and elsewhere on varying thicknesses of secondary dolomite that replaces Star Peak Group carbonate rocks. The Star Peak Group crops out in Churchill, Humboldt, Lander, and mostly Pershing Counties. Abundant fossil data from the Star Peak Group indicates this unit is latest Early (Spathian) to middle Late (Carnian) Triassic in age (Nichols and Silberling, 1977b).

Comments: Original map source: Crafford, A.E.J., 2007, Geologic Map of Nevada: U.S. Geological Survey Data Series 249, 1 CD-ROM, 46 p., 1 plate; Scale 1:250,000.

Lithology: Major:{limestone,dolostone,shale}, Minor:{sandstone,conglomerate}

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]

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


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Bailey and Phoenix (1944), Quicksilver Deposits in Nevada, Nevada Bureau of Mines and Geology, Bulletin 41.

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