Beat claim, Casa Loma, Dutch Flat Mining District (Towle Mining District), Placer County, California, USAi
| Regional Level Types | |
|---|---|
| Beat claim | Claim |
| Casa Loma | - not defined - |
| Dutch Flat Mining District (Towle Mining District) | Mining District |
| Placer County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 11' 58'' North , 120° 46' 40'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Alta | 610 (2011) | 3.0km |
| Dutch Flat | 160 (2011) | 5.2km |
| Washington | 185 (2011) | 17.9km |
| Colfax | 2,005 (2017) | 18.7km |
| Foresthill | 1,483 (2011) | 20.2km |
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 |
|---|---|---|
| Nevada County Gem & Mineral Society | Grass Valley, California | 24km |
A former Cr-Fe occurrence/claim/mine located on corner lot 18, sec. 6, T15N, R11E, MDM, 0.2 km (0.1 mile) SW of Casa Loma proper, on National Forest land. Discovered in 1917 by a Mr. Allen. First [production was 1918 and the last was in 1945. Ownerd by U.S. Forest Service - Tahoe National Forest (100%), California (1976). Operated by D. J. Sullivan (last operator), California (1976). MRDS database stated accuracy for this location is 100 meters. The location of the claim is uncertain. Stinson estimated the location dutring a field check in 1975.
Mineralization is a Cr deposit hosted in serpentinite. The ore body is 1.22 meters thick, 1.83 meters wide and 9.14 meters long at a thickness of 1 meter. Ore body #1 is disseminated & erregular; ore body #2 is tabular and ore body #3 is lenticular. The primary mode of origin was magmatic differentiation. Primary ore control was lithology. Wallrock alteration is intense (carbonitization). The deposit appears to be a weathered and eroded slide block and occurs at and near the surface. The largest ore body had the above dimensions. The deposit occurs in the easternmost of 3 sub-parallel belts of ultramafic rocks that trend northward across Placer County. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).
Workings include surface and underground openings and consisted of a system of tunnels driven a short distance below the pre-mining surface. Mine workings could not be found during a 1975 site visit.
Production statistics: Year: 1945 (period 1918-1945): Cr ore (estimated): ^ average 55% Cr2O3.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Formula: Fe2+Cr3+2O4 |
| ⓘ 'Fayalite-Forsterite Series' |
| ⓘ Magnesiochromite Formula: MgCr2O4 Description: Occurs as crystals to 12.5 mm diameter. |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
| ⓘ Uvarovite Formula: Ca3Cr2(SiO4)3 References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite ? | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Magnesiochromite | 4.BB.05 | MgCr2O4 |
| Group 9 - Silicates | |||
| ⓘ | Uvarovite | 9.AD.25 | Ca3Cr2(SiO4)3 |
| Unclassified | |||
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | Oxygen | |
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Magnesiochromite | MgCr2O4 |
| O | ⓘ Uvarovite | Ca3Cr2(SiO4)3 |
| O | ⓘ Fayalite-Forsterite Series | |
| O | ⓘ Pyroxene Group | ADSi2O6 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Mg | Magnesium | |
| Mg | ⓘ Magnesiochromite | MgCr2O4 |
| Mg | ⓘ Fayalite-Forsterite Series | |
| Si | Silicon | |
| Si | ⓘ Uvarovite | Ca3Cr2(SiO4)3 |
| Si | ⓘ Fayalite-Forsterite Series | |
| Si | ⓘ Pyroxene Group | ADSi2O6 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Ca | Calcium | |
| Ca | ⓘ Uvarovite | Ca3Cr2(SiO4)3 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Cr | ⓘ Magnesiochromite | MgCr2O4 |
| Cr | ⓘ Uvarovite | Ca3Cr2(SiO4)3 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Fayalite-Forsterite Series | |
Other Databases
| Link to USGS MRDS: | 10043541 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Calaveras-Baker DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060610621
