North Star Mine (Northstar Mine), Kofa Mining District, Yuma County, Arizona, USAi
| Regional Level Types | |
|---|---|
| North Star Mine (Northstar Mine) | Mine |
| Kofa Mining District | Mining District |
| Yuma County | County |
| Arizona | State |
| USA | Country |
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Latitude & Longitude (WGS84):
33° 17' 49'' North , 113° 58' 9'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| La Paz Valley | 699 (2011) | 40.1km |
| Brenda | 676 (2011) | 42.6km |
| Quartzsite | 3,626 (2017) | 47.4km |
| Vicksburg | 597 (2011) | 53.6km |
| Salome | 1,530 (2011) | 63.0km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Quartzsite Roadrunners Gem & Mineral Club | Quartzsite, Arizona | 47km |
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 ElementsMineral List
Mineral list contains entries from the region specified including sub-localities13 valid minerals.
Detailed Mineral List:
| ⓘ Baryte Formula: BaSO4 References: |
| ⓘ '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. References: |
| ⓘ 'K Feldspar var. Adularia' Formula: KAlSi3O8 Description: Microscopic mixture with quartz. References: |
| ⓘ 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. References: |
| ⓘ 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 | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| ⓘ | Silver | 1.AA.05 | Ag |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Boulangerite | 2.HC.15 | Pb5Sb4S11 |
| Group 3 - Halides | |||
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Bixbyite-(Mn) | 4.CB.10 | Mn3+2O3 |
| ⓘ | Quartz var. Chalcedony | 4.DA.05 | SiO2 |
| ⓘ | 4.DA.05 | SiO2 | |
| ⓘ | Todorokite | 4.DK.10 | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| ⓘ | Groutite | 4.FD.10 | Mn3+O(OH) |
| ⓘ | Manganite | 4.FD.15 | Mn3+O(OH) |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Rhodochrosite | 5.AB.05 | MnCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
| Group 9 - Silicates | |||
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Unclassified | |||
| ⓘ | 'K Feldspar var. Adularia' | - | KAlSi3O8 |
| ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'Psilomelane' | - | |
| ⓘ | 'K Feldspar' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| H | ⓘ Groutite | Mn3+O(OH) |
| H | ⓘ Manganite | Mn3+O(OH) |
| H | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| C | Carbon | |
| C | ⓘ Rhodochrosite | MnCO3 |
| O | Oxygen | |
| O | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| O | ⓘ Baryte | BaSO4 |
| O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| O | ⓘ Bixbyite-(Mn) | Mn23+O3 |
| O | ⓘ Quartz var. Chalcedony | SiO2 |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Groutite | Mn3+O(OH) |
| O | ⓘ Manganite | Mn3+O(OH) |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Rhodochrosite | MnCO3 |
| O | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| F | Fluorine | |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| F | ⓘ Fluorite | CaF2 |
| Na | Sodium | |
| Na | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Mg | Magnesium | |
| Mg | ⓘ Biotite | K(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 |
| Al | Aluminium | |
| Al | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Al | ⓘ Biotite | K(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 |
| Si | Silicon | |
| Si | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Si | ⓘ Quartz var. Chalcedony | SiO2 |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Baryte | BaSO4 |
| S | ⓘ Boulangerite | Pb5Sb4S11 |
| S | ⓘ Pyrite | FeS2 |
| K | Potassium | |
| K | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| K | ⓘ Biotite | K(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 |
| Ca | Calcium | |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Fluorite | CaF2 |
| Ca | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Ti | Titanium | |
| Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Mn | Manganese | |
| Mn | ⓘ Bixbyite-(Mn) | Mn23+O3 |
| Mn | ⓘ Groutite | Mn3+O(OH) |
| Mn | ⓘ Manganite | Mn3+O(OH) |
| Mn | ⓘ Rhodochrosite | MnCO3 |
| Mn | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Fe | Iron | |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Pyrite | FeS2 |
| Sr | Strontium | |
| Sr | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Ag | Silver | |
| Ag | ⓘ Silver | Ag |
| Sb | Antimony | |
| Sb | ⓘ Boulangerite | Pb5Sb4S11 |
| Ba | Barium | |
| Ba | ⓘ Baryte | BaSO4 |
| Ba | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Boulangerite | Pb5Sb4S11 |
Other Databases
| Link to USGS MRDS: | 10064557 |
|---|
Localities in this Region
- Arizona
- Yuma County
- Kofa Mining District
- North Star Mine (Northstar Mine)
- Kofa Mining District
- Yuma County
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Sonoran DesertDesert
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mojave DomainDomain
- Southern Basin and RangeWide Rift
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References
Jones, E.L., Jr. (1916), A reconnaissance in the Kofa Mountains, Arizona, USGS Bull. 620-H: 151-164.
(1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. University of Arizona Bulletin 134. Arizona Bureau of Minespages 42, 113-116
