Mahoney Mine (Mahoney No. 1 Mine; Johnson lease; Johnson Mine; Doak Mine), Castle Rock, Ladd-Buckeye Mining District, San Joaquin County, California, USAi
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Latitude & Longitude (WGS84):
37° 35' 58'' North , 121° 29' 49'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Tracy | 87,075 (2017) | 16.8km |
| Mountain House | 9,675 (2011) | 20.8km |
| Livermore | 88,126 (2017) | 25.6km |
| Westley | 603 (2011) | 26.8km |
| Grayson | 952 (2011) | 28.2km |
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 |
|---|---|---|
| Livermore Valley Lithophiles | Livermore, California | 26km |
| Stockton Lapidary & Mineral Club | Stockton, California | 44km |
| Mother Lode Mineral Society | Modesto, California | 44km |
| Santa Clara Valley Gem & Mineral Society | San Jose, California | 45km |
A former Mn mine located in the NE¼ sec. 11, T4S, R4E, MDM (UTM approximate), 4.2 km (2.6 miles) S of Castle Rock and 0.8 km (2,700 feet) S of the Ladd Mine (at the crest of the ridge across the canyon SE of the Ladd Mine), on private land. Discovered in 1914; first produced in 1915. Owner Harold B. Frybarger Et. Al 100.00 California 1975 Ownership is fee ownership. MRDS database stated accuracy for this location is 100 meters.
Mineralization is hosted in rocks of the Franciscan Complex (Late Cretaceous chert). The ore body strikes N35W and dips steeply 70S at a thickness of 3.05 meters and a length of 18.29 meters. The 2 ore bodies are 1.) sedimentary and irregular, and, 2.) shear zone. The primary mode of origin is sedimentation and the secondary mode is hydrothermal emplacement. Primary ore control was fracturing and the secondary control was bedding. There is no wallrock alteration. The ore bodies are near the base of a thick lens of Franciscan chert in approximately the same strategraphic horizon as the Ladd Mine. The bodies are 25 feet apart. The No. 2 ore bed is manganese oxide in a siliceous matrix, with less than 10% Mn. The No. 1 ore bed is over 60 feet long, 8 to 10 feet thick, and extends 30 feet up and down the dip. This bed contains high-grade ore. The ore material present is cellular chert veined and partly replaced by manganese oxides. The lower ore body is offset vertically by at least 3 faults which strike NW. Local rocks include rocks of the Franciscan melange and/or Plio-Pleistocene and Pliocene loosely consolidated deposits.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ 'Psilomelane' |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Unclassified | |||
|---|---|---|---|
| ⓘ | 'Psilomelane' | - | |
List of minerals for each chemical element
Other Databases
| Link to USGS MRDS: | 10033552 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- California Coast RangesAccretionary Complex
- Franciscan DomainDomain
- Great Valley BasinBasin
- Sonoma-Livermore BasinBasin
USA
- California
- Diablo RangeMountain Range
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0060770005
