Banner and Central Mine (Central Mine; Lava Cap Mine; Assissi Quartz Mine), Lava Cap-Banner-Central group (Central Consolidated; South Banner; North Banner), Banner Mountain (Banner Hill), Nevada City Mining District, Nevada County, California, USAi
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Latitude & Longitude (WGS84):
39° 13' 39'' North , 120° 58' 9'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Nevada City | 3,152 (2017) | 5.7km |
| Grass Valley | 12,944 (2017) | 8.0km |
| Dutch Flat | 160 (2011) | 11.6km |
| Alta Sierra | 6,911 (2011) | 12.0km |
| Alta | 610 (2011) | 13.8km |
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 |
|---|---|---|
| Nevada County Gem & Mineral Society | Grass Valley, California | 8km |
A former lode Au-Ag-Pb-Cu-W occurrence/mine located in the NE¼ sec. 16, 21 & in the NE¼ sec. 28, T16N, R9E, MDM, 2.1 km (1.3 miles) S of Banner Mountain, about 2½ miles SE of Nevada City and about 5 miles E of Grass Valley. Owned by the Lava Cap Gold Mining Corporation. MRDS database stated accuracy for this location is 500 meters.
Mineralization is hosted in the Calaveras Complex (argillite). The ore body is lenses and stringers, strikes N25W and dips 50E-51NE, at a thickness of 7.62 meters. There are two main ore zones: 1 under lava capping of Banner 100 feet depth; other part of the Central Mine. Controls for ore emplacement included faulting prior to, and after, deposition of quartz filling. Agrillite, belonging to the Calaveras Formation becomes siliceous toward a granodiorite contact on the north southern (sic) part of the mine cut by "latite" dikes, which are cut by ore fractures. In the Banner diorite and andesite dikes present, also older than the vein structure. Both types of dikes have no observable bearing on ore shoots. The veins are highly fractured from faulting. Associated rocks include Pennsylvanian diorite, latite and andesite. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).
Workings include surface and underground openings with a length of 792.48 meters and an overall depth of 304.8 meters and comprised of drifts, crosscuts, drill holes, raises & stopes. Both the Central and Banner Mines have 51 degree inclined shafts. For additional data on workings, see chandler: 413-419.
Production data are found in: Eric, J.C. (1948); Goodwin, Joseph Grant (1957).
Production statistics: Year: 1943 (period = 1934-1943): (estimated) ^50,000 tons of concentrates with 236,000 pounds Cu and 258,000 pounds Pb. Assays were $20 to $30 (period values) Au/ton.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
Mineral list contains entries from the region specified including sub-localities6 valid minerals.
Detailed Mineral List:
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Acanthite | 2.BA.35 | Ag2S |
| ⓘ | Pyrargyrite | 2.GA.05 | Ag3SbS3 |
| ⓘ | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
| ⓘ | 'var. Silver-bearing Tetrahedrite' | 2.GB.05 | (Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
| Group 9 - Silicates | |||
| ⓘ | Wollastonite | 9.DG.05 | Ca3(Si3O9) |
List of minerals for each chemical element
Other Databases
| Link to USGS MRDS: | 10101288 |
|---|
Localities in this Region
- California
- Nevada County
- Nevada City Mining District
- Banner Mountain (Banner Hill)
- Lava Cap-Banner-Central group (Central Consolidated; South Banner; North Banner)
- Banner and Central Mine (Central Mine; Lava Cap Mine; Assissi Quartz Mine)
- Lava Cap-Banner-Central group (Central Consolidated; South Banner; North Banner)
- Banner Mountain (Banner Hill)
- Nevada City Mining District
- Nevada County
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Foothills-Wallowa DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060570545
