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Poker Flat Mining District (Table Rock Mining District), Sierra County, California, USAi
| Regional Level Types | |
|---|---|
| Poker Flat Mining District (Table Rock Mining District) | Mining District |
| Sierra County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 41' 35'' North , 120° 50' 44'' West
Latitude & Longitude (decimal):
Type:
Kรถppen climate type:
NOTE: There is no file for this district in the USGS MRDS database.
Location: This district is in northern Sierra County about 10 miles N of Downieville. It includes the Howland Flat, Table Rock, Deadwood, Mt. Fillmore, Potosi, and Rattlesnake Peak areas. It is mainly a placer-mining district.
History: The streams were first mined during the gold rush. The locality was extremely rich then; in one month gold valued at $700,000 (period values) was produced. Hydraulic mining was done on a major scale from the late 1850's through the 1880's. Some lode mining and drift mining continued through the early 1900's, and the area was prospected in the 1920's and 1930's. The district was made famous by Bret Harte's tale, The Outcasts of Poker Flat. This district has been highly productive, the mines at Howland Flat alone being credited with an output valued at $14 million (period values).
Geology: The northern part of the district is underlain by amphibolite with some serpentine. To the south and east there are slates of the Blue Canyon Formation (Carboniferous). Substantial portions of the area are capped by andesite. Extensive deposits of Tertiary auriferous quartz gravels are part of the Port Wine channel, which extends W & NW through this district and then W and SW into the Port Wine district. The lower quartz-rich gravels were also gold-rich. Portions of the channel have been faulted. Some narrow gold-quartz veins occur in amphibolite and slate.
Mines: Placer: Caledonia, California, Clippership, Deadwood, Forest Queen, Gibraltar, Hawkeye, Herlamer and Bunker Hill, Manchester, Miners Home, Pacific, Poker Flat, Potosi, Rattlesnake, Scott, Virginia, Tennessee, Winkeye. Lode: Alhambra, Mammoth, Mt. Fillmore Consolidated, New York.
Location: This district is in northern Sierra County about 10 miles N of Downieville. It includes the Howland Flat, Table Rock, Deadwood, Mt. Fillmore, Potosi, and Rattlesnake Peak areas. It is mainly a placer-mining district.
History: The streams were first mined during the gold rush. The locality was extremely rich then; in one month gold valued at $700,000 (period values) was produced. Hydraulic mining was done on a major scale from the late 1850's through the 1880's. Some lode mining and drift mining continued through the early 1900's, and the area was prospected in the 1920's and 1930's. The district was made famous by Bret Harte's tale, The Outcasts of Poker Flat. This district has been highly productive, the mines at Howland Flat alone being credited with an output valued at $14 million (period values).
Geology: The northern part of the district is underlain by amphibolite with some serpentine. To the south and east there are slates of the Blue Canyon Formation (Carboniferous). Substantial portions of the area are capped by andesite. Extensive deposits of Tertiary auriferous quartz gravels are part of the Port Wine channel, which extends W & NW through this district and then W and SW into the Port Wine district. The lower quartz-rich gravels were also gold-rich. Portions of the channel have been faulted. Some narrow gold-quartz veins occur in amphibolite and slate.
Mines: Placer: Caledonia, California, Clippership, Deadwood, Forest Queen, Gibraltar, Hawkeye, Herlamer and Bunker Hill, Manchester, Miners Home, Pacific, Poker Flat, Potosi, Rattlesnake, Scott, Virginia, Tennessee, Winkeye. Lode: Alhambra, Mammoth, Mt. Fillmore Consolidated, New York.
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-localities6 valid minerals.
Detailed Mineral List:
| โ Chromite Formula: Fe2+Cr3+2O4 |
| โ Galena Formula: PbS |
| โ 'Margarodite' |
| โ Muscovite Formula: KAl2(AlSi3O10)(OH)2 References: |
| โ Muscovite var. Mariposite Formula: K(Al,Cr)2(Al,Si)4O10(OH)2 References: |
| โ Muscovite var. Phengite Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 References: |
| โ Native Gold Formula: Au Localities: Reported from at least 25 localities in this region. |
| โ Pyrite Formula: FeS2 Localities: Mount Filmore Consolidated Group Mine (Mount Filmore Cons. Grp.; Mt Fillmore Cons Group; Sunnyside claim; Blue Jay claim; Rattlesnake No. 1 & No. 2 claims), Mount Fillmore, Poker Flat Mining District (Table Rock Mining District), Sierra County, California, USA New York Mine, Poker Flat, Poker Flat Mining District (Table Rock Mining District), Sierra County, California, USA Lassiat claim, Poker Flat, Poker Flat Mining District (Table Rock Mining District), Sierra County, California, USA |
| โ Quartz Formula: SiO2 Localities: Reported from at least 12 localities in this region. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| โ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| โ | Galena | 2.CD.10 | PbS |
| โ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| โ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| โ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| โ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| โ | var. Phengite | 9.EC.15 | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| โ | var. Mariposite | 9.EC.15 | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Unclassified | |||
| โ | 'Margarodite' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | โ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | โ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| H | โ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| O | Oxygen | |
| O | โ Chromite | Fe2+Cr23+O4 |
| O | โ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | โ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| O | โ Quartz | SiO2 |
| O | โ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Mg | Magnesium | |
| Mg | โ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Al | Aluminium | |
| Al | โ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | โ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Al | โ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Si | Silicon | |
| Si | โ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | โ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Si | โ Quartz | SiO2 |
| Si | โ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| S | Sulfur | |
| S | โ Galena | PbS |
| S | โ Pyrite | FeS2 |
| K | Potassium | |
| K | โ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | โ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| K | โ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Cr | Chromium | |
| Cr | โ Chromite | Fe2+Cr23+O4 |
| Cr | โ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Fe | Iron | |
| Fe | โ Chromite | Fe2+Cr23+O4 |
| Fe | โ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Fe | โ Pyrite | FeS2 |
| Au | Gold | |
| Au | โ Native Gold | Au |
| Pb | Lead | |
| Pb | โ Galena | PbS |
Localities in this Region
- California
- Sierra County
- Poker Flat Mining District (Table Rock Mining District)
- Bunker Hill
- Deadwood
- Howland Flat
- Diana Mining Company placer prospect
- Faith claim (Wehrle claim)
- Hayes placer prospect
- Last Chance placer prospect
- Midas placer prospect
- Miners Home prospect (Hawkeye Mine; Union)
- Pennsylvania placer prospect
- Syndicate Mine
- Table Rock
- Unidentified Au mine [45]
- Unidentified Au mine [46]
- Unidentified Au mine [47]
- Unidentified Au mine [56]
- Virginia & Lincoln Mine (Virginia & Linclon; Virginia Mine)
- Winkeye Placer prospect (Winkeye)
- Mount Fillmore
- Poker Flat Mining District (Table Rock Mining District)
- Sierra County
- California
- Sierra County
- Poker Flat Mining District (Table Rock Mining District)
- Mount Fillmore
- Flanagan placer prospect (Helena)
- Golden Link prospect
- Gourley occurrence
- IXL group
- Kosmos & Keystone Extension placer prospect
- Mount Filmore Consolidated Group Mine (Mount Filmore Cons. Grp.; Mt Fillmore Cons Group; Sunnyside claim; Blue Jay claim; Rattlesnake No. 1 & No. 2 claims)
- Unidentified Au prospect [37]
- Unidentified Au prospect [43]
- Poker Flat
- Potosi
- Rattlesnake Peak
- Tennessee Mountain
- Mount Fillmore
- Poker Flat Mining District (Table Rock Mining District)
- Sierra 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
