Helen Mine (Helen Mine group; Dead Broke Mine; American Mine), Castle Rock Springs, East Mayacmas Mining District, Lake County, California, USAi
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Latitude & Longitude (WGS84):
38° 44' 28'' North , 122° 42' 0'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Middletown | 1,323 (2011) | 7.5km |
| Cobb | 1,778 (2011) | 9.2km |
| Hidden Valley Lake | 5,579 (2011) | 14.3km |
| Geyserville | 862 (2011) | 17.9km |
| Lower Lake | 1,294 (2011) | 20.4km |
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 |
|---|---|---|
| Santa Rosa Mineral And Gem Society, Inc. | Santa Rosa, California | 33km |
A former Hg mine located in sec. 1, T10N, R8W, MDM, 3.3 km (2.1 miles) SSE of Castle Rock Springs and 4 miles NW of the Great Western Mine. NOTE: Some refereneces place this mine in Sonoma County.
Veinlets and disseminations of mercury ores in dense opaline silica-carbonate rock, occurring in the footwall of a wide fault that separates serpentinite from sandstone. Some mineralization is also present in the sandstone and in highly altered basalt dykes that have intruded the serpentinite in the hanging wall of the fault.
Production data are found in: U.S. Bureau of Mines file data.
Veinlets and disseminations of mercury ores in dense opaline silica-carbonate rock, occurring in the footwall of a wide fault that separates serpentinite from sandstone. Some mineralization is also present in the sandstone and in highly altered basalt dykes that have intruded the serpentinite in the hanging wall of the fault.
Production data are found in: U.S. Bureau of Mines file data.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Aragonite Formula: CaCO3 Habit: Acicular Description: Occurs as needle-like crystals and crusts. |
| ⓘ Cinnabar Formula: HgS Description: Occurs in shoots in silica-carbonate rock. References: |
| ⓘ Epsomite Formula: MgSO4 · 7H2O Description: Forms during dry seasons along the margin of a seep at the base of the waste rock pile. |
| ⓘ Idrialite Formula: C22H14 References: |
| ⓘ 'Limonite' |
| ⓘ Marcasite Formula: FeS2 Description: Occurs in considerable quantities in some ores. References: |
| ⓘ Metacinnabar Formula: HgS Description: Occurs in shoots in silica-carbonate rock. References: |
| ⓘ Native Mercury Formula: Hg Description: Occurs in shoots in silica-carbonate rock. References: |
| ⓘ Opal Formula: SiO2 · nH2O |
| ⓘ Pyrite Formula: FeS2 References: |
| ⓘ Tiemannite Formula: HgSe References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Mercury | 1.AD.05 | Hg |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Metacinnabar | 2.CB.05a | HgS |
| ⓘ | Tiemannite | 2.CB.05a | HgSe |
| ⓘ | Cinnabar | 2.CD.15a | HgS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Marcasite | 2.EB.10a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Opal | 4.DA.10 | SiO2 · nH2O |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Aragonite | 5.AB.15 | CaCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Epsomite | 7.CB.40 | MgSO4 · 7H2O |
| Group 10 - Organic Compounds | |||
| ⓘ | Idrialite | 10.BA.20 | C22H14 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Epsomite | MgSO4 · 7H2O |
| H | ⓘ Idrialite | C22H14 |
| H | ⓘ Opal | SiO2 · nH2O |
| C | Carbon | |
| C | ⓘ Aragonite | CaCO3 |
| C | ⓘ Idrialite | C22H14 |
| O | Oxygen | |
| O | ⓘ Aragonite | CaCO3 |
| O | ⓘ Epsomite | MgSO4 · 7H2O |
| O | ⓘ Opal | SiO2 · nH2O |
| Mg | Magnesium | |
| Mg | ⓘ Epsomite | MgSO4 · 7H2O |
| Si | Silicon | |
| Si | ⓘ Opal | SiO2 · nH2O |
| S | Sulfur | |
| S | ⓘ Cinnabar | HgS |
| S | ⓘ Epsomite | MgSO4 · 7H2O |
| S | ⓘ Marcasite | FeS2 |
| S | ⓘ Metacinnabar | HgS |
| S | ⓘ Pyrite | FeS2 |
| Ca | Calcium | |
| Ca | ⓘ Aragonite | CaCO3 |
| Fe | Iron | |
| Fe | ⓘ Marcasite | FeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Se | Selenium | |
| Se | ⓘ Tiemannite | HgSe |
| Hg | Mercury | |
| Hg | ⓘ Cinnabar | HgS |
| Hg | ⓘ Native Mercury | Hg |
| Hg | ⓘ Metacinnabar | HgS |
| Hg | ⓘ Tiemannite | HgSe |
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- California Coast RangesAccretionary Complex
- Franciscan DomainDomain
USA
- California
- Mayacamas MountainsMountain Range
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