Douglas Flat placers, Douglas Flat, Vallecito Mining District, Calaveras County, California, USAi
| Regional Level Types | |
|---|---|
| Douglas Flat placers | Group of Placers |
| Douglas Flat | Unincorporated Community |
| Vallecito Mining District | Mining District |
| Calaveras County | County |
| California | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
38° 7' 19'' North , 120° 27' 22'' West
Latitude & Longitude (decimal):
Type:
Group of Placers
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Murphys | 2,213 (2015) | 1.8km |
| Vallecito | 442 (2011) | 3.8km |
| Forest Meadows | 1,249 (2015) | 6.7km |
| Angels Camp | 2,677 (2012) | 9.4km |
| Columbia | 2,297 (2017) | 10.7km |
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 |
|---|---|---|
| Calaveras Gem & Mineral Society | Angels Camp, California | 9km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 43km |
A former placer Au-PGE (Pt) deposit located in secs. 8 & 17, T3N, R14E, MDM, 0.8 km (0.5 mile N of Douglas Flat (5 miles NE of Angels Camp, 5 miles S of Murphys). Discovered in 1848. Owned by T.B. Bishop Co. (1962). Operated by Vallecito Western Mining Co. (1923). MRDS database stated accuracy for this location is 1,000 meters. The exact location is uncertain. Location given (in MRDS file) is for the adit on the South Ditch shown on the topo map.
Mineralization is a placer Au-PGE deposit (Deposit Model: 119; USGS model code 39a; BC deposit profile: C01. C02; Deposit model name: Placer Au-PGE; Mark3 model number: 54), hosted in rocks of the Franciscan Formation (conglomerate, Eocene gravel of the Ione Formation). The ore body is stream sediment deposits. The bedrock is limestone, schist, slate & amphibolite. The gravels are overlain in places by rhyolite and andesite. The gravels are richest near the bedrock. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).
Workings include surface and underground openings with a length of 1,615.44 meters and an overall depth of 58.52 meters. Mining was hydraulic methods during the 1850's to the 1880's, drift mining during the 1880's and 1930's, and dragline mining in the 1930's.
Concentrate yielded $807.78 (period values)/ton Au (0.032 ounce/ton (1.1 ppm)); $10.50 (period values)/ton Pt (0.00029 ounces/ton (10 ppb) (concentrated from 60 tons to 100 pounds).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ Native Gold Formula: Au Description: Placer material. |
| ⓘ Native Platinum Formula: Pt Description: Placer material. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| ⓘ | Native Platinum | 1.AF.10 | Pt |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | Iron | |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Pt | Platinum | |
| Pt | ⓘ Native Platinum | Pt |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10038060 |
|---|
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
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
