Brunswick Mine (Brunswick vein; New Brunswick Mine), Idaho-Maryland group, Grass Valley, Grass Valley Mining District, Nevada County, California, USAi
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Latitude & Longitude (WGS84):
39° 12' 41'' North , 121° 1' 5'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Grass Valley | 12,944 (2017) | 3.8km |
| Nevada City | 3,152 (2017) | 5.6km |
| Alta Sierra | 6,911 (2011) | 8.3km |
| Rough and Ready | 963 (2011) | 10.4km |
| Colfax | 2,005 (2017) | 13.5km |
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 | 4km |
| Sutter Buttes Gem & Mineral Society | Marysville, California | 50km |
A former lode Au-Ag-Cu-Zn-Pb occurrence/mine located in secs. 25 & 36, T16N, R8E, MDM, about 4.0 km (2.4 miles) E of Grass Valley proper. The property comprises 27 acres. MRDS database stated accuracy for this location is 1,000 meters.
Mineralization is a vein deposit. The ore body strikes N50W and dips 40-70SW at a thickness of 1.52 meters. The vein is part of the Idaho-Maryland system and is a few inches to 5 feet thick, averaging 2 feet. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).
Workings include surface and underground openings with a length of 1,219.2 meters and an overall depth of 410.57 meters and comprised of 2 shafts at 1,250 feet & 1,347 feet, respectively, plus extensive drifting and stoping.
Production data are found in: MacBoyle (1919), and in Johnston (1940).
Some Au-Ag production in 1953. In 1917 ores from the upper levels contained 1.6% sulfides, averaging 1.64 ounces Au/ton 2.0% sulfides from the upper levels averaged 2.8 ounces Au/ton.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Galena Formula: PbS |
| ⓘ Native Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ 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 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| 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: | 10007407 |
|---|
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
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060570352
Brunswick Mine, Idaho-Maryland group, Grass Valley, Grass Valley Mining District, Nevada County, California, USA