Plomosa placers, Plomosa Placer Mining District, La Posa Plain, La Paz County, Arizona, USAi
| Regional Level Types | |
|---|---|
| Plomosa placers | Group of Placers |
| Plomosa Placer Mining District | Mining District |
| La Posa Plain | Plains |
| La Paz County | County |
| Arizona | State |
| USA | Country |
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Latitude & Longitude (WGS84):
33° 37' 45'' North , 114° 7' 5'' West
Latitude & Longitude (decimal):
Type:
Group of Placers
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Quartzsite | 3,626 (2017) | 11.0km |
| La Paz Valley | 699 (2011) | 12.8km |
| Brenda | 676 (2011) | 17.0km |
| Utting | 126 (2011) | 31.6km |
| Bouse | 996 (2011) | 35.3km |
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 |
|---|---|---|
| Quartzsite Roadrunners Gem & Mineral Club | Quartzsite, Arizona | 11km |
Other/historical names associated with this locality:
Plomosa Placer deposits; Jack Pot; Saxe; Chrystal Butte; Aplington
A former surface and underground placer gold (and PGE ?) deposit area located in secs. 3, 9, 16, T3N, R18W, and in sec. 34, T4N, R18W, on the eastern edge of the La Posa plain and near the western foot of the Plomosa Mountains, about 5 miles SE of Quartzsite, on land of unknown status. Started in the early 1860s and produced until the 1950s.
Mineralization is placer gold probably derived from gold-bearing quartz veins and stringers in schist of the Plomosa Mountains to the east. The placer gravels occur in certain old drainage channels leading away from the southwestern part of the mountains. The gravels are comprised of fragments of schist, granite, and quartz, cemented by lime carbonate (caliche). This conglomerate or 'cement rock' varies in thickness from a few inches up to many feet, depending largely on the shape and size of the former channels, and rests upon grayish-green, schistose bedrock. Nearer the mountains, the gold is coarser.
Workings include pits that have been sunk to a depth of 20, 30, and 50 feet or more to beds of cement, which are richer than gravel. Bancroft found in 1909 that portions of the ground had been honeycombed with small tunnels.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
1 valid mineral.
Detailed Mineral List:
| ⓘ Native Gold Formula: Au |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
List of minerals for each chemical element
| Au | Gold | |
|---|---|---|
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10234991 |
|---|---|
| Link to USGS MRDS: | 10038172 |
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Sonoran DesertDesert
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mojave DomainDomain
- Southern Basin and RangeWide Rift
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