St. Lawrence Mine, Ophir, Ophir Mining District (Auburn Mining District; Duncan Hill Mining District), Placer County, California, USAi
| Regional Level Types | |
|---|---|
| St. Lawrence Mine | Mine |
| Ophir | - not defined - |
| Ophir Mining District (Auburn Mining District; Duncan Hill Mining District) | Mining District |
| Placer County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 53' 60'' North , 121° 7' 35'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Newcastle | 1,224 (2011) | 2.9km |
| Auburn | 13,953 (2017) | 4.3km |
| North Auburn | 13,022 (2011) | 5.2km |
| Penryn | 831 (2011) | 6.5km |
| Cool | 4,100 (2017) | 9.8km |
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 | 22km |
| Fossils for Fun Society, Inc. | North Highlands, California | 32km |
| Sacramento Valley Detecting Buffs | North Highlands, California | 32km |
| El Dorado County Mineral and Gem Society | Placerville, California | 34km |
| Gold Country Treasure Seekers | Placerville, California | 34km |
Mindat Locality ID:
85806
Long-form identifier:
mindat:1:2:85806:6
GUID (UUID V4):
8fd5e49b-f84c-4c41-a0c3-7f791fb990c2
A former Au-Sb-Ag-Pb mine located in the S½S½SW¼ sec. 7, T12N, R8E, MDM, 1.0 km (0.6 mile/3,400 feet) NNW of Ophir and Ophir School, about 2½ miles W of Auburn (1½ miles NNE of Newcastle), on private (patented) land. Operated during the period 1903 to 1912. MRDS database stated accuracy for this location is 500 meters.
Mineralization is a vein deposit hosted in granodiorite and diorite. The ore body strikes E and dips 45S at a thickness of 0.51 meter. The vein is 1 foot (30 cm) to 20 inches (50 cm) thick and carries 2% sulfides. 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 304.8 meters and an overall depth of 91.44 meters and comprised of a shaft, 2 tunnels (?) and adits.
Production data are found in: Logan, Clarence August (1936).
Some production was reported during the 1903-1912 period. No other production records were found.
Analytical data results: SThe sulfides assayed at $70 to $200 (period values)/ton.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Galena Formula: PbS |
| ⓘ Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Stibnite Formula: Sb2S3 References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
| ⓘ | 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 | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Stibnite | Sb2S3 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Sb | Antimony | |
| Sb | ⓘ Stibnite | Sb2S3 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10007693 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Foothills-Wallowa DomainDomain
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060610112
