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North Star Mine (Northstar Mine), Kofa Game Range, Kofa District, Kofa Mts (S.H. Mts), Yuma Co., Arizona, USA

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Latitude & Longitude (WGS84): 33° 17' 49'' North , 113° 58' 9'' West
Latitude & Longitude (decimal): 33.29694,-113.96917
GeoHash:G#: 9myvqtd0v
Other regions containing this locality:Sonoran Desert, North America
Locality type:Mine
Köppen climate type:BWh : Hot deserts climate

A former underground Au-Ag mine located in the center (NE¼SW¼) of sec. 36, T1S, R17W (protracted), about 1¾ miles North of the King of Arizona Mine, on federal land. Discovered in 1906 by Felix Mayhew. Operated 1907-1911. Owned by the Golden Star Mining & Milling Co. (1907). Operated by the Caprock Energy Ltd. (1986, Vancouver, British Columbia).

Mineralization is the North Star vein. fine-grained free gold with minor silver and finely divided and disseminated pyrite in high-grade shoots and chimneys in a lode-like vein of silicified and altered Cretaceous or Tertiary andesite breccia, quartz, and banded chalcedony, with some adularia which strikes east and dips about 60ºN. The lode is an average 10 feet (3 meters) wide. The vein is along a fault zone with pink, flow-banded biotite andesite on the hanging wall and Mesozoic calcareous schist or slate on the footwall, which contains finely disseminated pyrite in places. The vein matter is striking in appearance. Near the surface are angular fragments of the pink andesite.

Workings include extensive underground openings from shafts. No. 2 shaft (500 feet deep on incline), No. 1 shaft (90 feet deep on incline), plus drifts & crosscuts each level at 100 foot intervals. An adit from the footwall side connects with the first level from No. 2 shaft. Total length of development work is about 3,500 feet.

It produced some 38,735 tons of ore averaging about 1.4 oz. Au/T and 0.6 oz. Ag/T., with a total value of more than $1,100,000 (period values). Much additional high-grade ore was stolen during the operation. A 50-ton capacity cyanide plant was erected (1908), which was later doubled. The underground workings were dewatered, and underground drilling and sampling were conducted during the period 1984-1986.

Mineral List

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

13 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: 2939106
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
Show map

  • Arizona
    • Yuma Co.
      • Kofa Mts (S.H. Mts)
        • Kofa District
          • Kofa Game Range

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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Jones, E.L., Jr. (1915), Gold deposits near Quartzsite, Arizona, USGS Bull. 620: 45-57, 159-160.
Jones, E.L., Jr. (1916), A reconnaissance in the Kofa Mountains, Arizona, USGS Bull. 620-H: 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: 42, 113-116.
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: 139-141.
Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 88.
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).
Niemuth, N.J. (1987), Arizona Mineral Development 1984-1986, Arizona Department of Mines & Mineral Resources Directory 29, 46 pp.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 140, 143, 339.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10064557, MRDS ID #TC38959; and, Dep. ID #10234464, MAS ID #0040270307.

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