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North San Juan Mining District, Nevada County, California, USAi
| Regional Level Types | |
|---|---|
| North San Juan Mining District | Mining District |
| Nevada County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° North , 120° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~68km
Type:
Kรถppen climate type:
Location: This district is in northwestern Nevada County 9 miles NW of Nevada City. It consists of the placer deposits that extend from the vicinity of North San Juan southwest for about 2ยฝ miles to the Sweetland area. It was named for a nearby hill with the "North" added to distinguish it from San Juan (now San Juan Bautista) in San Benito County.
Geology: A main Tertiary channel of the Yuba River extends into the area from the Badger Hill and North Columbia districts from the east and another from Camptonville from the northwest. The channel then extends SW through Sweetland into the French Corral district. The gravels are 150 to 400 feet thick and up to 1,000 feet wide. The low gravels yielded up to $0.30 (period values) per cubic yard in Au, mostly from hydraulicking. The bedrock is granodiorite with amphibolite to the W. There are several narrow gold-quartz veins in the amphibolite.
Geology: A main Tertiary channel of the Yuba River extends into the area from the Badger Hill and North Columbia districts from the east and another from Camptonville from the northwest. The channel then extends SW through Sweetland into the French Corral district. The gravels are 150 to 400 feet thick and up to 1,000 feet wide. The low gravels yielded up to $0.30 (period values) per cubic yard in Au, mostly from hydraulicking. The bedrock is granodiorite with amphibolite to the W. There are several narrow gold-quartz veins in the amphibolite.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded from this region.Mineral List
Mineral list contains entries from the region specified including sub-localities18 valid minerals.
Detailed Mineral List:
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| โ | Native Copper | 1.AA.05 | Cu |
| โ | Native Gold | 1.AA.05 | Au |
| โ | Native Silver | 1.AA.05 | Ag |
| โ | Native Osmium | 1.AF.05 | (Os,Ir,Ru) |
| โ | Rutheniridosmine | 1.AF.05 | (Ir,Os,Ru) |
| โ | Native Ruthenium | 1.AF.05 | (Ru,Ir) |
| โ | Native Osmium var. Iridosmine | 1.AF.05 | (Os,Ir) |
| โ | Native Iridium | 1.AF.10 | (Ir,Os,Ru) |
| โ | Native Palladium | 1.AF.10 | (Pd,Pt) |
| โ | Native Iridium var. Ruthenosmiridium | 1.AF.10 | (Ir,Os,Ru) |
| โ | var. Osmiridium | 1.AF.10 | (Ir,Os,Ru) |
| โ | Graphite | 1.CB.05a | C |
| Group 2 - Sulphides and Sulfosalts | |||
| โ | Chalcocite | 2.BA.05 | Cu2S |
| โ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| โ | Kotulskite | 2.CC.05 | Pd(Te,Bi)2-x (x โ 0.4) |
| โ | Vysotskite | 2.CC.35a | PdS |
| โ | Laurite | 2.EB.05a | RuS2 |
| โ | Pyrite | 2.EB.05a | FeS2 |
| โ | Hollingworthite | 2.EB.25 | (Rh,Pt,Pd)AsS |
| Group 4 - Oxides and Hydroxides | |||
| โ | Quartz | 4.DA.05 | SiO2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| โ | Chalcanthite | 7.CB.20 | CuSO4 ยท 5H2O |
List of minerals for each chemical element
Localities in this Region
- California
- Nevada County
- California
- Nevada County
- North San Juan Mining District
- Nevada County
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Calaveras-Baker DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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References
Yuba River placers, North San Juan, North San Juan Mining District, Nevada County, California, USA