Jack Sprat No. 4 (Black Joe Mine), Jack Sprat group, Hog Mountain, Fresno County, California, USAi
| Regional Level Types | |
|---|---|
| Jack Sprat No. 4 (Black Joe Mine) | - not defined - |
| Jack Sprat group | - not defined - |
| Hog Mountain | Mountain |
| Fresno County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
36° 53' 30'' North , 119° 20' 20'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Squaw Valley | 3,162 (2011) | 18.7km |
| Minkler | 1,003 (2011) | 21.5km |
| Centerville | 392 (2011) | 22.5km |
| Shaver Lake | 634 (2011) | 23.7km |
| Auberry | 2,369 (2011) | 24.7km |
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 |
|---|---|---|
| Fresno Gem & Mineral Society | Fresno, California | 42km |
A former Cr occurrence/mine located in sec. 15, T12S, R24E, MDM, 2.4 km (1.5 miles) WNW of Hog Mountain (coordinates of record), along the crest of the mountain, and S of Watts Valley, on private land. 1 of 6 claims in the Jack Sprat group. MRDS database stated accuracy for this location is 100 meters.
Mineralization is hosted in serpentinite. The ore body is irregular in form. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).
The chromite deposits of Watts Valley occur on the eastern limb of a synclinal, NE-plunging, ultramafic sill. The eastern limb, known as Hog Mountain, is a little over 1 mile wide, while the western limb, which forms Red Mountain, averages 3 miles wide. The 2 limbs join to the NW and together form a discontinuous, triangular exposure of peridotite 10 miles long and 8 miles wide across the base.
Workings include surface and underground openings comprised of an open cut 27 feet long, a 33 foot adit, and a winze 35 feet deep. Ore was mined at the rate of 2 tons per day during production years.
Production data are found in: Rynearson, Garn Arthur (1948): 89.
Production statistics: Year: 1919 (period 1917-1919): ^40% Cr2O3.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsGallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Other Databases
| Link to USGS MRDS: | 10043674 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Foothills-Wallowa 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 ID #0060190209
