Mayflower Chrome Mine (Burnham and Wilson Mine; Mayflower property; Mayflower deposit), Mountain Top, French Creek Mining District, Calaveras County, California, USAi
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Latitude & Longitude (WGS84):
37° 57' 30'' North , 120° 33' 29'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Copperopolis | 3,671 (2011) | 7.8km |
| Tuttletown | 668 (2011) | 9.4km |
| Jamestown | 3,433 (2011) | 11.9km |
| Angels Camp | 2,677 (2012) | 12.3km |
| Chinese Camp | 126 (2011) | 14.6km |
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 |
|---|---|---|
| Calaveras Gem & Mineral Society | Angels Camp, California | 12km |
A Cr deposit/occurrence located in the NW¼, sec. 9, T1N, R13E MDM, 1.5 km (0.9 mile) ESE of Mountain Top, and about 5 miles SE of Copperopolis (about 1,300 feet NW of the Liberty Mine; a short distance SW of Bean Gulch near the center of the NW¼ of the section). Discovered and first operated in 1916. Owned & operated by C.A. Gillis, California (1941-1976). Owned by the U.S. Bureau of Land Management, Sacramento Office, California (100%) (1976). MRDS database stated accuracy for this location is 10 meters.
The ore body strikes N30W and dips 90N at a thickness of 3 meters, width of 10 meters and a length of 30 meters. It is tabular, disseminated. A second (?) ore body is lenticular. The primary mode of origin was magmatic differentiation. Primary ore control was lithology. Wallrock alteration is intense (carbonitization). Chromite lenses 1 to 4 feet thick. Most of the ore is black, massive and medium-grained chromite having a submetallic luster. Small amounts of medium grade disseminated ore are present. Considerable talc and kammererite occur with the chromite. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).
Workings include surface and underground openings comprised of a small shaft 15 feet deep and an open cut 45 feet long, 3 to 4 feet wide, and 40 feet deep. There is also a caved tunnel about 100 feet long.
Production was 667 long tons containing 48% Cr2O3. Reserves probably limited to a few tons.
Analytical data results: Ore shipped assayed at 48% Cr2O3.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Formula: Fe2+Cr3+2O4 |
| ⓘ Clinochlore Formula: Mg5Al(AlSi3O10)(OH)8 |
| ⓘ Clinochlore var. Chromium-bearing Clinochlore Formula: Mg5(Al,Cr)2Si3O10(OH)8 |
| ⓘ 'Fayalite-Forsterite Series' |
| ⓘ Magnesiochromite Formula: MgCr2O4 |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
| ⓘ Talc Formula: Mg3Si4O10(OH)2 Description: Considerable quantities present. |
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 | |||
| ⓘ | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
| ⓘ | Clinochlore | 9.EC.55 | Mg5Al(AlSi3O10)(OH)8 |
| ⓘ | var. Chromium-bearing Clinochlore | 9.EC.55 | Mg5(Al,Cr)2Si3O10(OH)8 |
| Unclassified | |||
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Calaveras-Baker DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- California
- Mother Lode BeltBelt
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