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Cinnabar Mine (Cinnabar group; Colonial Mining Co. property; Carlson claims; C.O. Carlson claims), Cinnabar, La Cholla District, Dome Rock Mts, La Paz Co., Arizona, USA

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Latitude & Longitude (WGS84): 33° 33' 25'' North , 114° 21' 47'' West
Latitude & Longitude (decimal): 33.55694,-114.36306
Köppen climate type:BWh : Hot deserts climate
Other regions containing this locality:Sonoran Desert, North America

‡Ref.: Bancroft, Howland (1910) Notes on the occurrence of cinnabar in central western Arizona, in Contributions to economic geology, 1909; Pt. 1, Metals and nonmetals except fuels: U.S. Geological Survey Bulletin 430, p. 151-153.

Bancroft, H. (1911), Reconnaissance of the ore deposits in northern Yuma County, Arizona, USGS Bull. 451: 82.

Lausen, C. & E. Gardner (1927), Quicksilver Resources of Arizona, Arizona Bureau of Mines Bull. 122: 29-31.

Wilson (1941).

Keith, Stanton B. (1978) State of Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Bull. 192, Index of Mining Properties in Yuma County, Arizona: 156 (Table 4).

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Departmenty of Mines & Mineral Resources Open File Rept. 92-10: 8 (Table 1).

Bailey, E.H., USGS, personal files.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10040385, MRDS ID #M055134; and, Dep. ID #10137841, MAS ID #0040120141.

A former surface and underground Hg-Cu-Au-Ag-Pb-Mo mine located in the NE corner of sec. 9, T2N, R20W (sec. 31, T3N, R20W per MRDS) (Cunningham Mountain 7.5 minute topo map), in the Dome Rock Mountains 8 miles SW of Quartzsite, on federal land. Discovered 1861. Owned at times, or in part, by the Colonial Mining Co.; and Mr. C. H. Coleman of Yuma, AZ. Operated by the Cinnabar Development Co.

Mineralization is a vein deposit with a tabular ore body with spotty, disseminated cinnabar and with minor metacinnabar, secondary copper minerals, gold, silver and sparse wulfenite with brecciated quartz, gouge, calcite, and siderite and strong iron oxide staining, in a fault fissure in Mesozoic metamorphosed schist. The ore zone is 1219. 2 meters long, 1.52 meters wide, strikes N53W, and dips vertically. Precambrian schists and granite are overlain and intruded by Tertiary volcanics. The Hg is probably derived from mercurial tetrahedrite. The ore has been leached near the surface. A parallel vein occurs for a few hundred feet. The richness of the ore is variable along the vein.

Workings include one 178 foot shaft; one 148 foot shaft; and 145 feet of drifts. The main shaft is 640 feet deep with seven levels. The lowest level extends 400 feet; stopes. Discovered in the 1880's but only worked from shafts and open cuts from 1904 through 1914. The mine was closed in 1914. Water stands in the mine. The workings achieved a depth of 195.007 meters. In 1908 between 100-140 flasks were produced. It produced roughly 116 or more flasks of mercury. Assays showed 0.06 Hg, 0.36 Hg; ore ran 8 pounds Hg per ton.

Mineral List

10 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

Oxfordian - Hettangian
157.3 - 201.3 Ma

ID: 2847766
Jurassic volcanic rocks

Age: Jurassic (157.3 - 201.3 Ma)

Stratigraphic Name: Ali Molina Formation; Topawa Group; Mount Wrightson Formation; Canelo Hills Volcanics; Cobre Ridge Tuff; Black Rock volcanics; Planet Volcanics

Description: Massive quartz-feldspar porphyry, generally interpreted as thick, welded rhyolitic tuffs, with locally abundant lava, and sandstone and conglomerate derived from volcanic rocks. Rare eolian quartzite units are interbedded in southern Arizona. Includes Ali Molina Formation, Mount Wrightson Formation, part of the Canelo Hills Volcanics, Cobre Ridge tuff, Black Rock volcanics, Planet Volcanics, and equivalent rocks. (160-200 Ma)

Comments: The Jurassic quartz porphyry, Ali Molina, Mt Wrightson, Cobre Ridge, Black Rock volcanics, Planet Volcanics.

Lithology: Major:{rhyolite,sandstone,conglomerate}, Minor:{quartzite}

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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