Douglas Flat placers, Douglas Flat, Vallecito Mining District, Calaveras County, California, USAi
Regional Level Types | |
---|---|
Douglas Flat placers | Group of Placers |
Douglas Flat | Flat |
Vallecito Mining District | Mining District |
Calaveras County | County |
California | State |
USA | Country |
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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 |
Mindat Locality ID:
75135
Long-form identifier:
mindat:1:2:75135:6
GUID (UUID V4):
1b7a05dc-ba34-410a-9f24-fcefe9b277b7
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:
ⓘ Gold Formula: Au Description: Placer material. |
ⓘ Hematite Formula: Fe2O3 |
ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
ⓘ Platinum Formula: Pt Description: Placer material. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Gold | 1.AA.05 | Au |
ⓘ | 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 | ⓘ Platinum | Pt |
Au | Gold | |
Au | ⓘ Gold | Au |
Other Databases
Link to USGS MRDS: | 10038060 |
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