Eureka Mining District, Sierra Co., California, USAi
| Regional Level Types | |
|---|---|
| Eureka Mining District | Mining District |
| Sierra Co. | County |
| California | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Key
Latitude & Longitude (WGS84):
39° 36' 38'' North , 120° 53' 45'' West
Latitude & Longitude (decimal):
Locality type:
KΓΆppen climate type:
Location: This is an extensive area of scattered placers and a few lode deposits in northwestern Sierra County about eight miles northwest of Downieville. It includes the "diggings" not only at Eureka but also at Craig's Flat, Morristown, and Saddleback Mountain. It is surrounded by a number of famous placer-mining districts: Downieville, Poker Flat, Port Wine, Poverty Hill, and Brandy City.
History: The hydraulic mines here were worked on a major scale from the 1850s to the middle 1880's, and then intermittently on a small scale through the 1930's.
Geology: The principal Tertiary channel deposits are at Eureka, Craig's Flat, Morristown, and Monte Cristo, the most extensive being at Eureka. They are part of the Eureka channel, an indistinct branch of the Tertiary North Fork of the Yuba River. As in the other nearby placer-mining districts, the chief values were obtained from the lower quartzitic gravels. Some very coarse nuggets have been found here. Bedrock consists of slate and phyllite and several narrow belts of greenstone and serpentine. Several of the high ridges are capped by andesite. There are a few gold-quartz veins, the most productive having been at the Telegraph mine, which is on a slate-serpentine contact.
Regions containing this locality
| North America Plate | Tectonic Plate |
Select Mineral List Type
Standard Detailed Strunz Dana Chemical ElementsMineral List
Mineral list contains entries from the region specified including sub-localities4 valid minerals.
Detailed Mineral List:
| β Arsenopyrite Formula: FeAsS Description: Coarse material bearing Au. Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10034771. |
| β Gold Formula: Au Localities: Reported from at least 16 localities in this region. |
| β Pyrite Formula: FeS2 Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| β Quartz Formula: SiO2 |
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| β | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| β | Arsenopyrite | 2.EB.20 | FeAsS |
| β | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| β | Quartz | 4.DA.05 | SiO2 |
List of minerals arranged by Dana 8th Edition classification
| Group 1 - NATIVE ELEMENTS AND ALLOYS | |||
|---|---|---|---|
| Metals, other than the Platinum Group | |||
| β | Gold | 1.1.1.1 | Au |
| Group 2 - SULFIDES | |||
| AmBnXp, with (m+n):p = 1:2 | |||
| β | Arsenopyrite | 2.12.4.1 | FeAsS |
| β | Pyrite | 2.12.1.1 | FeS2 |
| Group 75 - TECTOSILICATES Si Tetrahedral Frameworks | |||
| Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si | |||
| β | Quartz | 75.1.3.1 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | β Quartz | SiO2 |
| Si | Silicon | |
| Si | β Quartz | SiO2 |
| S | Sulfur | |
| S | β Pyrite | FeS2 |
| S | β Arsenopyrite | FeAsS |
| Fe | Iron | |
| Fe | β Pyrite | FeS2 |
| Fe | β Arsenopyrite | FeAsS |
| As | Arsenic | |
| As | β Arsenopyrite | FeAsS |
| Au | Gold | |
| Au | β Gold | Au |
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)Turner, Henry Ward (1897), Description of the gold belt: description of the Downieville sheet: USGS Geol. Atlas Downieville folio (Folio No. 37), 8 pp.
Lindgren, Waldemar (1911), The Tertiary gravels of the Sierra Nevada of California: USGS Professional Paper 73, 226 pp.
Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 46.
Localities in this Region
- California
- Sierra Co.
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.
