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King of Arizona Mine (King of Arizona property; King of Arizona group of claims; King of Arizona vein; Kofa Mine; Gleason Mine; Homestake claim), Kofa Game Range, Kofa District, Kofa Mts (S.H. Mts), Yuma Co., Arizona, USA

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Latitude & Longitude (WGS84): 33° 16' 9'' North , 113° 57' 58'' West
Latitude & Longitude (decimal): 33.26917,-113.96611
Other regions containing this locality:Sonoran Desert, North America
Köppen climate type:BWh : Hot deserts climate

A former underground Au-Ag(58:1)-Mn mine located on 4 full claims (Homestake; King of Arizona; Last Hope; Mucho Bueno) in the center of sec. 12, T2S, R17W, south end of the Kofa Mountains, on federal land. This mine is partially on the Homestake claim, which covers the chief workings of the mining operation. Outcrops at an elevation of about 1,700 feet above sea level. Discovered by Charles E. Eichelberger. Owned at times, or in part, by the King of Arizona Mining & Milling Co.; Rob Roy Development Co.; and the Kofa Mining Syndicate. Operated by Barons Gold, Inc., Lethbridge, Alberta, Canada (1986). Started winter 1896 and closed Jan 1899. Reopened August 1899 and ceased operations about July, 1910. Last produced 1939.

Mineralization is fine-grained free gold with silver in a layered quartz gangue in an irregular fissure vein (King of Arizona vein) in a large shear zone cutting Cretaceous or Tertiary rhyolite volcanics and silicified, brecciated andesite. The lode is 670.56 meters long, 3.66 meters wide, with a depth to top of 0 meters, is 228.6 meters thick, and trends between N.60ºW. & West and dips at an angle of 60ºS. The orebody is said to average 12 feet wide. Lode matter is a brecciated, generally brown to maroon andesite porphyry. The andesite is partly silicified, particularly where fissuring is closely spaced. There are many quartz and manganocalcite stringers that traverse the lode in all directions, from knife-blade thick to several feet wide. Vein width increases with depth but with decreasing values.

A strong vein of gold-bearing quartz. The vein width increases with depth but with decreasing values. The footwall of the vein is generally a well-defined slicken-sided plane, but the hanging wall is indefinate. The ore body contained many small fissures and small slip planes, and most of them are parallel to the trend of the ore body, but several lie at angles with the vein, generally coming in from the hanging wall side, and make horses of barren material. About 200 feet east of the shaft strong cross-fissures filled with calcite apparently limit the ore. There are 3 well-marked divisions or layers within the vein. On the hanging wall there is a soft layer from 3 to 3½ inches (7.5 to 9 cm) wide averaging $800 Au/T (period values). Next, below this is a middle layer or body of quartz about 20 inches (50 cm) thick averaging about $190-200 Au/T (period values). The remainder of the vein averages $24 Au/T (period values). The vein is crosscut West of the shaft & proved to be 18 inches wide (45 cm) The lode trends between N.60ºW. & West and dips about 60ºS.

Workings are extensive underground with stopes from surface to the 750 foot level serviced by a 750 foot (228 meters) deep inclined shaft. Drifts on the 100 foot level and an adit at the collar level. Drifts West of the shaft are over 2,000 feet long; while on the East they are not longer than 200 feet. This mine was worked from the late 1880's to 1910, and sporadically through 1937. It produced some 739,300 tons of ore averaging about 0.23 oz. Au/T and 0.1 oz. Ag/T, valued at 3,500,000 in Au (period values). Barons constructed an agitation leach facility and began production in late 1986 from tailings.

Mineral List

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

15 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 Macrostrat.org

Quaternary - Miocene
0 - 23.03 Ma

ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 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]

Tortonian - Bartonian
7.246 - 41.3 Ma

ID: 2850100
Middle Miocene to Oligocene volcanic rocks

Age: Cenozoic (7.246 - 41.3 Ma)

Stratigraphic Name: Peach Springs Tuff; Apache Leap Tuff

Description: Lava, tuff, fine-grained intrusive rock, and diverse pyroclastic rocks. These compositionally variable volcanic rocks include basalt, andesite, dacite, and rhyolite. Thick felsic volcanic sequences form prominent cliffs and range fronts in the Black (Mohave County), Superstition, Kofa, Eagletail, Galiuro, and Chiricahua Mountains. This unit includes regionally extensive ash-flow tuffs, such as the Peach Springs tuff of northwestern Arizona and the Apache Leap tuff east of Phoenix. Most volcanic rocks are 20-30 Ma in southeastern Arizona and 15 to 25 Ma in central and western Arizona, but this unit includes some late Eocene rocks near the New Mexico border in east-central Arizona. (11-38 Ma)

Lithology: Major:{basalt,andesite,dacite}, Minor:{rhyolite}

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License

Localities in this Region

  • Arizona
    • Yuma Co.
      • Kofa Mts (S.H. Mts)
        • Kofa District
          • Kofa Game Range
            • King of Arizona Mine (King of Arizona property; King of Arizona group of claims; King of Arizona vein; Kofa Mine; Gleason Mine; Homestake claim)

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.


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Blake, W.P. (1898) Distribution of metallic wealth in Arizona, in Report of the Governor of Arizona to the Secretary of the Interior for fiscal year ending June 30, 1898: Washington, D.C.: 19-86.
Jones, E.L., Jr. (1915), A Reconnaissance in the Kofa Mountains, Arizona, USGS Bull. 620: 151-164.
Thompson (1925), Arizona Mining Journal, Nov 1925: 9(12): 7.
Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 109-113.
Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bull. 137: 137-139.
Elsing, M.J. and Heineman, E.S. (1936) Arizona Metal Production, Arizona Bureau of Mines Bulletin 140: 104.
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: 155 (Table 4).
Hankins, D.D. (1984) Geologic setting of precious metals mineralization, King of Arizona district, Kofa Mountains, Yuma County, Arizona: San Diego, San Diego State University, M.S. thesis, 135 p., 1 sheet, scale 1:12,000.
Niemuth, N.J. (1987), Arizona Mineral Development 1984-1986, Arizona Department of Mines & Mineral Resources Directory 29, 46 pp.
Rocks & Minerals (1989): 64: 58.
Rocks & Minerals (1990): 65: 455.
Sawyer, M.B., Gurmendi, A.C., Daley, M.R., and Howell, S.B. (1992) Principal Deposits of Strategic and Critical Minerals in Arizona, U.S. Bureau of Mines Special Publication, 334 pp.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 124, 165, 240, 333, 343, 398.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10027228, MRDS ID #M002551; and, Dep. ID #10162346, MAS ID #0040270250.

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