St. Johns Mine (St. John Mine; Vallejo Mine; St. Johns Quicksilver Mine), Sulfur Springs Mountain, Vallejo, Solano County, California, USAi
| Regional Level Types | |
|---|---|
| St. Johns Mine (St. John Mine; Vallejo Mine; St. Johns Quicksilver Mine) | Mine |
| Sulfur Springs Mountain | Mountain |
| Vallejo | - not defined - |
| Solano County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 9' 6'' North , 122° 11' 30'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| American Canyon | 20,554 (2017) | 6.6km |
| Vallejo | 121,253 (2017) | 7.8km |
| Crockett | 3,094 (2011) | 11.2km |
| Green Valley | 1,625 (2011) | 11.5km |
| Benicia | 28,167 (2017) | 11.8km |
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 |
|---|---|---|
| Vallejo Gem & Mineral Society | Vallejo, California | 8km |
| Contra Costa Mineral & Gem Society | Concord, California | 24km |
| Northern California Geological Society | Orinda, California | 31km |
| Antioch Lapidary Club | Antioch, California | 38km |
| San Francisco Gem and Mineral Society, Inc. | San Francisco, California | 46km |
Mindat Locality ID:
95625
Long-form identifier:
mindat:1:2:95625:2
GUID (UUID V4):
1a1f2962-99a6-4836-9f37-8f500e07ea15
A former Hg occurrence/mine located in the N½SE¼NE¼ sec. 33, T4N, R3W, MDM, 5.8 km (3.6 miles) NE of Vallejo, on the N end of the mountain. Discovered in 1852 by John Neate. Owned by Mrs. C. Dennis (1939). Operated by J. C. Lawley (1939). First production was during 1873. Other production periods included 1873-1880, 1902-1908, 1914-1920, 1923, 1930, 1935-1940 and 1942. MRDS database stated accuracy for this location is 100 meters.
Mineralization is hosted in Jurassic serpentinite (170.5 ma ± 7.5), sandstone, and andesite. The ore body is tabular. Controls for ore emplacement included a breccia zone. Jurassic (?) sediments and Jurassic (?) serpentine in breccia beneath a thrust fault. Both rocks are intruded by andesite dikes. Dumps of old tunnels show schists. Local alteration includes silica-carbonate from serpentine and andesite. Local rocks include Franciscan Complex, unit 1 (Coast Ranges).
Local structures include a prominent N-S fracture system in the sandstone; and a thrust fault.
Workings include underground openings with a length of 2,590.8 meters and an overall depth of 198.12 meters. Workings were inaccessible in 1965.
Production data are found in U.S. Bureau of Mines file data. Production was 130-150 pounds Hg per foot of workings (unspecified).
Analytical data results: Assays 2-3 pounds (1 to 1.5 kg) Hg/ton or less.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
4 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Cinnabar Formula: HgS Description: Occurs in fine-grained silica-carbonate rock near a contact of serpentine and sediments of the Great Valley sequence. References: |
| ⓘ Epsomite Formula: MgSO4 · 7H2O |
| ⓘ Marcasite Formula: FeS2 Description: Occurs in small amounts in cinnabar ore. |
| ⓘ Quartz Formula: SiO2 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Cinnabar | 2.CD.15a | HgS |
| ⓘ | Marcasite | 2.EB.10a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Epsomite | 7.CB.40 | MgSO4 · 7H2O |
| Unclassified | |||
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Epsomite | MgSO4 · 7H2O |
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | Oxygen | |
| O | ⓘ Epsomite | MgSO4 · 7H2O |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Mg | Magnesium | |
| Mg | ⓘ Epsomite | MgSO4 · 7H2O |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| S | Sulfur | |
| S | ⓘ Cinnabar | HgS |
| S | ⓘ Epsomite | MgSO4 · 7H2O |
| S | ⓘ Marcasite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Marcasite | FeS2 |
| Hg | Mercury | |
| Hg | ⓘ Cinnabar | HgS |
Other Databases
| Link to USGS MRDS: | 10040639 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Franciscan DomainDomain
- Sonoma-Livermore BasinBasin
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References
