Wisconsin Quartz Mine (Menlo; Wisconsin-Illinois; Wisconsin and Illinois claim), Empire West Mine (Lone Ridge), Empire Star group (Empire Star Mines Company holdings), Grass Valley, Grass Valley Mining District, Nevada County, California, USAi
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Latitude & Longitude (WGS84):
39° 11' 30'' North , 121° 4' 12'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Grass Valley | 12,944 (2017) | 3.1km |
| Alta Sierra | 6,911 (2011) | 5.7km |
| Rough and Ready | 963 (2011) | 7.1km |
| Nevada City | 3,152 (2017) | 9.0km |
| Penn Valley | 1,621 (2011) | 10.4km |
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 | 3km |
| Sutter Buttes Gem & Mineral Society | Marysville, California | 45km |
A former lode Au occurrence/mine located in secs. 2 & 3, T15N, R8E, MDM, about 3.3 km (1.8 miles) SSW of Grass Valley, SE of The Punchbowl, on private (patented) land. The property comprises 13.76 acres. (Foote (1941) groups the Wisconsin/Illinois claim in secs. 2 & 3, totaling 29 acres). MRDS database accuracy for this location is not stated. This mine is part of the Empire West Consolidated group.
Mineralization is a vein deposit hosted in granodiorite. The ore body strikes NW and dips 35SW at a thickness of 0.3 meter. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Workings include underground openings with a length of 365.76 meters and an overall depth of 426.72 meters and comprised of an inclined shaft, drifts, crosscuts & raises.
Production data are found in: MacBoyle (1918), Hobson (1890), and in Johnson(1940).
Production statistics: Year: 1900 (period = 1892 to 1900 (accurate): 16 grams Au/metric ton.
An early estimate by Hobson was $14 (period values) of Au/ton and $75 to $100 (period values) per ton of sulfides. The average Au content in the upper levels was estimated at 1½ ounces Au/ton with concentrates averaging 4½% (of what ?) per ton.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
Mineral list contains entries from the region specified including sub-localities3 valid minerals.
Detailed Mineral List:
| ⓘ Ferrimolybdite Formula: Fe2(MoO4)3 · nH2O References: |
| ⓘ 'Limonite' |
| ⓘ Native Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Ferrimolybdite | 7.GB.30 | Fe2(MoO4)3 · nH2O |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| O | Oxygen | |
| O | ⓘ Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Fe | Iron | |
| Fe | ⓘ Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| Mo | Molybdenum | |
| Mo | ⓘ Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10007278 |
|---|
Localities in this Region
- California
- Nevada County
- Grass Valley Mining District
- Grass Valley
- Empire Star group (Empire Star Mines Company holdings)
- Empire West Mine (Lone Ridge)
- Wisconsin Quartz Mine (Menlo; Wisconsin-Illinois; Wisconsin and Illinois claim)
- Empire West Mine (Lone Ridge)
- 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
