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North Star Mine (Northstar Mine), Kofa Mining District, Yuma County, Arizona, USAi
Regional Level Types
North Star Mine (Northstar Mine)Mine
Kofa Mining DistrictMining District
Yuma CountyCounty
ArizonaState
USACountry

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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
GRN:
N23W68
Type:
Mine
Köppen climate type:
BWh : Hot deserts climate
Nearest Settlements:
PlacePopulationDistance
La Paz Valley699 (2011)40.1km
Brenda676 (2011)42.6km
Quartzsite3,626 (2017)47.4km
Vicksburg597 (2011)53.6km
Salome1,530 (2011)63.0km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Quartzsite Roadrunners Gem & Mineral ClubQuartzsite, Arizona47km
Mindat Locality ID:
33522
Long-form identifier:
mindat:1:2:33522:8
GUID (UUID V4):
b05851e6-5fb3-40bd-a67d-c4cc12e901c0


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.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

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

13 valid minerals.

Detailed Mineral List:

ⓘ Baryte
Formula: BaSO4
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ Bixbyite-(Mn)
Formula: Mn3+2O3
ⓘ Boulangerite
Formula: Pb5Sb4S11
Description: Occurs in veinlets.
ⓘ 'Chlorite Group'
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘ Fluorite
Formula: CaF2
ⓘ Gold
Formula: Au
Description: Very finely divided free gold, associated with sulfides in chalcedonic quartz.
ⓘ Groutite
Formula: Mn3+O(OH)
ⓘ 'K Feldspar'
Description: Microscopic mixture with quartz.
ⓘ 'K Feldspar var. Adularia'
Formula: KAlSi3O8
Description: Microscopic mixture with quartz.
ⓘ Manganite
Formula: Mn3+O(OH)
ⓘ 'Psilomelane'
ⓘ Pyrite
Formula: FeS2
Description: Finely disseminated in calcareous shale footwall rock.
ⓘ Quartz
Formula: SiO2
Description: Crystals.
ⓘ Quartz var. Chalcedony
Formula: SiO2
Description: Banded; a breccia cement.
ⓘ Rhodochrosite
Formula: MnCO3
ⓘ Silver
Formula: Ag
Description: With gold.
ⓘ Todorokite
Formula: (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘSilver1.AA.05Ag
ⓘGold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
ⓘPyrite2.EB.05aFeS2
ⓘBoulangerite2.HC.15Pb5Sb4S11
Group 3 - Halides
ⓘFluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
ⓘBixbyite-(Mn)4.CB.10Mn3+2O3
ⓘQuartz4.DA.05SiO2
ⓘvar. Chalcedony4.DA.05SiO2
ⓘTodorokite4.DK.10(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
ⓘGroutite4.FD.10Mn3+O(OH)
ⓘManganite4.FD.15Mn3+O(OH)
Group 5 - Nitrates and Carbonates
ⓘRhodochrosite5.AB.05MnCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBaryte7.AD.35BaSO4
Group 9 - Silicates
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Unclassified
ⓘ'K Feldspar
var. Adularia'		-KAlSi3O8
ⓘ'Psilomelane'-
ⓘ'Chlorite Group'-
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'K Feldspar'-

List of minerals for each chemical element

HHydrogen
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ GroutiteMn3+O(OH)
Hⓘ ManganiteMn3+O(OH)
Hⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
CCarbon
Cⓘ RhodochrositeMnCO3
OOxygen
Oⓘ K Feldspar var. AdulariaKAlSi3O8
Oⓘ BaryteBaSO4
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ Bixbyite-(Mn)Mn23+O3
Oⓘ Quartz var. ChalcedonySiO2
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ GroutiteMn3+O(OH)
Oⓘ ManganiteMn3+O(OH)
Oⓘ QuartzSiO2
Oⓘ RhodochrositeMnCO3
Oⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ FluoriteCaF2
NaSodium
Naⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
AlAluminium
Alⓘ K Feldspar var. AdulariaKAlSi3O8
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
SiSilicon
Siⓘ K Feldspar var. AdulariaKAlSi3O8
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ Quartz var. ChalcedonySiO2
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ QuartzSiO2
SSulfur
Sⓘ BaryteBaSO4
Sⓘ BoulangeritePb5Sb4S11
Sⓘ PyriteFeS2
KPotassium
Kⓘ K Feldspar var. AdulariaKAlSi3O8
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
CaCalcium
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caⓘ FluoriteCaF2
Caⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
MnManganese
Mnⓘ Bixbyite-(Mn)Mn23+O3
Mnⓘ GroutiteMn3+O(OH)
Mnⓘ ManganiteMn3+O(OH)
Mnⓘ RhodochrositeMnCO3
Mnⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
FeIron
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ PyriteFeS2
SrStrontium
Srⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
AgSilver
Agⓘ SilverAg
SbAntimony
Sbⓘ BoulangeritePb5Sb4S11
BaBarium
Baⓘ BaryteBaSO4
Baⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
AuGold
Auⓘ GoldAu
PbLead
Pbⓘ BoulangeritePb5Sb4S11

Other Databases

Link to USGS MRDS:10064557

Localities in this Region

USA
  • Arizona
    • Yuma County
      • Kofa Mining District

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

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.

References

MRDS database Dep. ID file #10064557, MRDS ID #TC38959; and, Dep. ID #10234464, MAS ID #0040270307.
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.
(1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. University of Arizona Bulletin 134. Arizona Bureau of Minespages 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, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.) University of Arizona Press, Tucson, AZ.
(n.d.) ADMMR Mines Database, Arizona Geological Survey.
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