North Star group, Empire Star group (Empire Star Mines Company holdings), Grass Valley, Grass Valley Mining District, Nevada County, California, USAi
| Regional Level Types | |
|---|---|
| North Star group | - not defined - |
| Empire Star group (Empire Star Mines Company holdings) | Group of Mines |
| Grass Valley | Valley |
| Grass Valley Mining District | Mining District |
| Nevada County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 12' 5'' North , 121° 4' 17'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Grass Valley | 12,944 (2017) | 2.2km |
| Rough and Ready | 963 (2011) | 6.4km |
| Alta Sierra | 6,911 (2011) | 6.8km |
| Nevada City | 3,152 (2017) | 8.1km |
| Penn Valley | 1,621 (2011) | 10.3km |
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 |
|---|---|---|
| Nevada County Gem & Mineral Society | Grass Valley, California | 2km |
| Sutter Buttes Gem & Mineral Society | Marysville, California | 45km |
A group of mines owned by the Empire Star Mines Co., on a 1,200 acre patented tract. Includes the Gold Hill, New York Hill, New Rocky Bar, Granite Hill, Cincinnati & others. Point selected for the geographic coordinates is the shaft of the namesake mine, the North Star.
1933 - 1934 figures for the North Star and Empire Mines. Combined production of the Grass Valley holdings of the North Star Mines up to the end of 1928 was $33,267,734 (period values). Concentrates averaged $60 to $125 (period values) per ton. Production yield decreases with depth while horizontal yield per square foot increases: $50 to $100 Au/ton 5 - 150 foot level; to 3,000 feet averages $20 Au/ton. For additional production data see Logan (1930): 121-124.
1933 - 1934 figures for the North Star and Empire Mines. Combined production of the Grass Valley holdings of the North Star Mines up to the end of 1928 was $33,267,734 (period values). Concentrates averaged $60 to $125 (period values) per ton. Production yield decreases with depth while horizontal yield per square foot increases: $50 to $100 Au/ton 5 - 150 foot level; to 3,000 feet averages $20 Au/ton. For additional production data see Logan (1930): 121-124.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
Mineral list contains entries from the region specified including sub-localities10 valid minerals.
Detailed Mineral List:
| ⓘ Ankerite Formula: Ca(Fe2+,Mg)(CO3)2 |
| ⓘ Calcite Formula: CaCO3 Localities: New York Hill Mine (New York Hill vein; North Star vein), North Star group, Empire Star group (Empire Star Mines Company holdings), Grass Valley, Grass Valley Mining District, Nevada County, California, USA North Star Mine, North Star group, Empire Star group (Empire Star Mines Company holdings), Grass Valley, Grass Valley Mining District, Nevada County, California, USA |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Dolomite Formula: CaMg(CO3)2 Description: Mg:Fe = 3:2. |
| ⓘ Galena Formula: PbS |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Native Gold Formula: Au Localities: Reported from at least 6 localities in this region. |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 Localities: Reported from at least 6 localities in this region. |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Ankerite | 5.AB.10 | Ca(Fe2+,Mg)(CO3)2 |
| ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| C | Carbon | |
| C | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Dolomite | CaMg(CO3)2 |
| O | Oxygen | |
| O | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Dolomite | CaMg(CO3)2 |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Mg | Magnesium | |
| Mg | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Mg | ⓘ Dolomite | CaMg(CO3)2 |
| Al | Aluminium | |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| K | Potassium | |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Dolomite | CaMg(CO3)2 |
| Fe | Iron | |
| Fe | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10086478 |
|---|
Localities in this Region
- California
- Nevada County
- Grass Valley Mining District
- Grass Valley
- Empire Star group (Empire Star Mines Company holdings)
- North Star group
- Central North Star Mine
- Cincinnatti Hill Quartz Mine (Cincinnatti Hill Mine; Cincinnatti Hill Qtz.)
- Fahey Mine
- Gold Bar Quartz Mine (Gold Bar Qtz.)
- Great Britain Consolidated Quartz Mine (Great Britain Con. Qtz.; Great Britian)
- New York Hill Mine (New York Hill vein; North Star vein)
- North Star Mine
- North Star group
- Empire Star group (Empire Star Mines Company holdings)
- Grass Valley
- Grass Valley Mining District
- Nevada County
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Foothills-Wallowa DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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References
North Star Mine, North Star group, Empire Star group, Grass Valley, Grass Valley Mining District, Nevada County, California, USA