Mountain Spring Mine, Boulder Park, Imperial County, California, USAi
| Regional Level Types | |
|---|---|
| Mountain Spring Mine | Mine |
| Boulder Park | Park |
| Imperial County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
32° 41' 48'' North , 116° 3' 42'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Ocotillo | 266 (2011) | 7.8km |
| Jacumba Hot Springs | 561 (2014) | 14.9km |
| Ejido Jacumé | 290 (2013) | 16.9km |
| Rumorosa | 1,836 (2018) | 19.2km |
| Boulevard | 315 (2011) | 20.2km |
A former limestone-W (trace) deposit/quarry located in the NE¼SE¼ sec. 16, T17S, R9E, SBM, 5.6 km (3.5 miles) NE of Boulder Park, along In-Ko-Pah Gorge, (9 miles NE of Jacumba), on Bureau of Land Management administered wilderness land. MRDS database stated accuracy for this location is 10 meters. Production occurred prior to 1927, in 1940 & in 1959.
Mineralization is a sedimentary deposit hosted in metasedimentary rocks. The ore body is lenticular in form, strikes N65W and dips 45SW at a thickness of 9.14 meters and a length of 487.68 meters. Coarsely crystalline, white to gray limestone forms 1,600 foot long lens that is up to 30 feet thick within a larger tabular body of the metasedimentary rocks. The limestone contains minor schist and graphite as well as irregular skarn pods along its margin. Irregular pods of garnet-epidote-quartz skarn occur along the margins of the limestone lens. The skarn pods are up to 5 feet thick and 15 feet long. The tabular body of metasedimentary rocks is enclosed in tonalite and forms a screen. The screen also contains biotite schist and narrow pegmatite dikes along the bedding. Associated rocks include Late Cretaceous tonalite (tonalite of La Posta). Local rocks include Mesozoic granitic rocks, unit 2 (Peninsular Ranges).
Workings include surface openings with an overall depth of 10.67 meters and an overall length of 21.34 meters, and comprised of an open cut 70 feet across and 35 feet high plus 3 small prospect pits in the skarn zones.
Production information: A few hundred tons were mined in 1940 & 1950.
Analytical data results: Samples of the limestone averaged 0.6% Al2O3, 51.8% CaO, 0.14% Fe2O3, 1.6% MgO, <0.03% P2O5, & 9.6% SiO2. One of the samples from the skarn zones contained 0.08% WO3.
Reserve-Resource data are found in: Todd and others (1987).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
3 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:
| ⓘ 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ 'Garnet Group' Formula: X3Z2(SiO4)3 |
| ⓘ Graphite Formula: C |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Graphite | 1.CB.05a | C |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Unclassified | |||
| ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| ⓘ | 'Garnet Group' | - | X3Z2(SiO4)3 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| C | Carbon | |
| C | ⓘ Graphite | C |
| O | Oxygen | |
| O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Garnet Group | X3Z2(SiO4)3 |
| F | Fluorine | |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Mg | Magnesium | |
| Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Al | Aluminium | |
| Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | Silicon | |
| Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Garnet Group | X3Z2(SiO4)3 |
| K | Potassium | |
| K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Ca | Calcium | |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ti | Titanium | |
| Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | Iron | |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Other Databases
| Link to USGS MRDS: | 10023473 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America Plate
- Franciscan DomainDomain
- Peninsular Ranges BatholithVolcanic Arc
- Southern California Borderland BasinsBasin
Pacific PlateTectonic Plate
USA
- California
- Jacumba MountainsMountain Range
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