Stonewall Mine (Pedro prospect; Pedro claim), Browns Flat, Columbia Mining District, East Belt, Tuolumne County, California, USAi
| Regional Level Types | |
|---|---|
| Stonewall Mine (Pedro prospect; Pedro claim) | Mine |
| Browns Flat | Flat |
| Columbia Mining District | Mining District |
| East Belt | - not defined - |
| Tuolumne County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 0' 6'' North , 120° 22' 49'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Sonora | 4,818 (2017) | 2.0km |
| East Sonora | 2,266 (2011) | 3.1km |
| Columbia | 2,297 (2017) | 4.3km |
| Phoenix Lake | 4,269 (2017) | 6.4km |
| Jamestown | 3,433 (2011) | 6.5km |
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 | 16km |
A former pocket Au-Mn occurrence/prospect/mine located in sec. 25, T2N, R14E, MDM, 0.5 km (1,600 feet) ESE of Browns Flat, on the lower SW slope of Bald Mountain (0.1 mile W of highway 49, and 0.1 mile S of the junction of highway 49 and the Road to Columbia, 2 miles N of Sonora), on private land. Discovered in 1917. The claim(s) encompass 20 acres. Owned by A. L. Pedro, California (1974). MRDS database accuracy for this location is not stated.
NOTE: There are apparently 2 separate deposits/occurrences within a very small area. The Pedro is Mn and the Stonewall is a Au vein deposit. There are 4 MRDS database files and 2 MAS-MILS file number which pertain to this/these occurrence(s). All the MRDS files, except file #10165823 presents both names for the locality.
Mineralization is a vein deposit hosted in mica schist. Ore on the dump consists of partially oxidized pink rhodonite, coated by black oxides, psilomelane and pyrolusite. Rhodonite meta-chert found in the pit bottom, probably not in situ, is recrystallized to fine-grained gray quartzite, containing patches and grains of rhodonite. The block was derived from a bed at least 1 foot thick, and 5 or more feet long. Just N of the prospect is a granitic-appearing rock, close to biotite diorite porphyry. Local rocks include Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada) and/or limestone of probable Paleozoic or Mesozoic age.
Workings include surface and underground openings comprised of several shafts and adits on the vein, plus a pit.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Native Gold Formula: Au |
| ⓘ 'Psilomelane' |
| ⓘ Pyrolusite Formula: Mn4+O2 |
| ⓘ Rhodonite Formula: CaMn3Mn[Si5O15] References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| Group 9 - Silicates | |||
| ⓘ | Rhodonite | 9.DK.05 | CaMn3Mn[Si5O15] |
| Unclassified | |||
| ⓘ | 'Psilomelane' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Pyrolusite | Mn4+O2 |
| O | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
| Si | Silicon | |
| Si | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
| Ca | Calcium | |
| Ca | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
| Mn | Manganese | |
| Mn | ⓘ Pyrolusite | Mn4+O2 |
| Mn | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10033743 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Shoofly-Olds Ferry DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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