Alabama Mine (Alabama vein), Penryn (Stewart's Flat), Penryn Mining District, Placer County, California, USAi
| Regional Level Types | |
|---|---|
| Alabama Mine (Alabama vein) | Mine |
| Penryn (Stewart's Flat) | - not defined - |
| Penryn Mining District | Mining District |
| Placer County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 50' 39'' North , 121° 9' 25'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Penryn | 831 (2011) | 1.4km |
| Newcastle | 1,224 (2011) | 3.9km |
| Loomis | 6,733 (2017) | 4.0km |
| Granite Bay | 20,402 (2011) | 9.0km |
| Rocklin | 61,213 (2017) | 9.0km |
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 |
|---|---|---|
| Roseville Rock Rollers | Roseville, California | 15km |
| Fossils for Fun Society, Inc. | North Highlands, California | 26km |
| Sacramento Valley Detecting Buffs | North Highlands, California | 26km |
| El Dorado County Mineral and Gem Society | Placerville, California | 34km |
| Gold Country Treasure Seekers | Placerville, California | 34km |
Mindat Locality ID:
85012
Long-form identifier:
mindat:1:2:85012:5
GUID (UUID V4):
19101fe1-8aa6-4b1d-aa57-ba92845235ee
A former Au-Ag-Pb-Cu-As-Sb-Bi occurrence/mine located in the SE¼ sec. 35, T12N, R7E, MDM, 1.4 km (0.9 mile) SE of Penryn, on private (patented) land. First operated in the 1850's. MRDS database stated accuracy for this location is 100 meters.
Mineralization is a seam deposit hosted in granodiorite and gabbro. The ore body is irregular in form, strikes N and dips 90 at a thickness of 2.13 meters. Agouge zone 2 to 4 inches thick occurs along both walls of the vein. Local alteration includes oxidation of sulfides in irregular places to a depth of 1,045 feet. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).
Workings include underground openings with a length of 1,524 meters and an overall depth of 152.4 meters and comprised of 2 shafts, drifts, stopes and several levels.
Production data are found in: Logan, Clarence August (1936).
No pre-1933 production records were found.
Analytical data results: Assays averaged $9 (period values) Au/ton. Concentrates contained 9 ounces Au & 120 ounces Ag/ton.
Ag:Au was 3:1. 75% of the Au was from flotation cells; 25% Au & 100% Ag came from concentrates.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Acanthite Formula: Ag2S References: |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Galena Formula: PbS References: |
| ⓘ Gold Formula: Au References: |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Acanthite | 2.BA.35 | Ag2S |
| ⓘ | 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 | ⓘ Acanthite | Ag2S |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Ag | Silver | |
| Ag | ⓘ Acanthite | Ag2S |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10007685 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Foothills-Wallowa DomainDomain
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References
