Pleasanton Mine (Pleasanton group), Ibex Hills, San Bernardino County, California, USAi
| Regional Level Types | |
|---|---|
| Pleasanton Mine (Pleasanton group) | Mine |
| Ibex Hills | Group of Hills |
| San Bernardino County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
35° 46' 39'' North , 116° 24' 43'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
A former talc-soapstone occurrence/mine located in sec. 35, T20N, R5E, SBM, on National Park Service land (Death Valley National Park). MRDS database stated accuracy for this location is 10 meters.
Local rocks include Precambrian rocks, undivided, unit 1 (Death Valley).
Workings include unspecified underground openings (the topo map reflects 1 shaft symbol labeled "Pleasanton Mine" at this point).
Just to the south of the Monarch is the Pleasanton group of two talc claims, first opened in 1942. The Sierra Talc Company acquired the lease to this group also in 1946, and total production for the mine reached 16,000 tons by 1947. The Pleasanton was then idle for several years, until the Southern California Minerals Company acquired its lease in 1956, and connected the underground workings with those of the Monarch. Operated together, the Monarch and Pleasanton yielded another 7,500 tons between 1956 and 1959, for a total combined production of 69,500 tons. Between 1959 and 1968, intermittent operations were continued, but site examination indicates that little serious production was undertaken during that time. Both the Monarch and Pleasanton mines are now idle, and have been for several years.
At the Pleasanton, more extensive mining structures remain. Like the Moorehouse, the Pleasanton was worked on several levels, with a (collapsed) connecting shaft in between. On the lower level is a large loading dock and tramway network, used for loading both Monarch and Pleasanton ores during the latter years of combined operations. On the upper workings are several shafts and adits, complete with a partial tramway and a wooden headframe. Although interesting, these structures are not nearly as complete as those of the Moorehouse....Latschar, 1981
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
1 valid mineral.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 9 - Silicates | |||
|---|---|---|---|
| ⓘ | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Talc | Mg3Si4O10(OH)2 |
| O | Oxygen | |
| O | ⓘ Talc | Mg3Si4O10(OH)2 |
| Mg | Magnesium | |
| Mg | ⓘ Talc | Mg3Si4O10(OH)2 |
| Si | Silicon | |
| Si | ⓘ Talc | Mg3Si4O10(OH)2 |
Other Databases
| Link to USGS MRDS: | 10286032 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mojave DomainDomain
- Southern Basin and RangeWide Rift
USA
- Death Valley National ParkNational Park
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