Michigan Bar Mines, Bridge House, Michigan Bar Mining District, Sacramento County, California, USAi
| Regional Level Types | |
|---|---|
| Michigan Bar Mines | Group of Mines |
| Bridge House | - not defined - |
| Michigan Bar Mining District | Mining District |
| Sacramento County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 29' 31'' North , 121° 5' 27'' West
Latitude & Longitude (decimal):
Type:
Group of Mines
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Rancho Murieta | 5,488 (2011) | 1.2km |
| Wilton | 5,363 (2011) | 18.1km |
| Clay | 1,195 (2011) | 18.3km |
| Gold River | 7,912 (2011) | 20.2km |
| Ione | 7,000 (2017) | 20.7km |
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 |
|---|---|---|
| Amador County Gem & Mineral Society | Sutter Creek, California | 27km |
| Fossils for Fun Society, Inc. | North Highlands, California | 33km |
| Sacramento Valley Detecting Buffs | North Highlands, California | 33km |
| Roseville Rock Rollers | Roseville, California | 34km |
| Sacramento Mineral Society | Sacramento, California | 36km |
A former placer Au-PGE (Pt-Ir-Os) mine and Pb-Zn occurrence located between Bridge House and Michigan Bar. Location given is at the Bridge Hopuse River Crossing.
Mineralization is a stream placer deposit hosted in the Ione Formation (gravel). Local rocks include Eocene nonmarine rocks, unit 1 (Northern and Central California).
Local tectonic structures include the base of the Sierra Nevada foothills.
Workings included drift mining (1850's and 1860's); hydraulic mining (1930's and 1940's). A small acreage dredged.
Production data are found in: Clark (1970).
Analytical data results: PGE sample yielded 44.75% Pt, 24.84% Ir, 21.72% Os, 8.69% Rh (Mertie, table 40).
Result: PGE sample yielded 33.3% Pt, 41.97% Os+Ir, 18.88% Ir, 13.58% Au(Logan: P. 109).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Galena Formula: PbS References: |
| ⓘ Native Gold Formula: Au Description: Placer gold. |
| ⓘ Native Platinum Formula: Pt Description: Placer material that averages 44.75% Pt, 24.84% Ir, 21.72% Os, and 8.69% Ru. References: |
| ⓘ Pyrite Formula: FeS2 References: |
| ⓘ Sphalerite Formula: ZnS References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| ⓘ | Native Platinum | 1.AF.10 | Pt |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Pt | Platinum | |
| Pt | ⓘ Native Platinum | Pt |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10038018 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- California Central ValleyAccretionary Complex
- Foothills-Wallowa DomainDomain
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