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Poker Flat Mining District (Table Rock Mining District), Sierra Co., California, USAi
Regional Level Types
Poker Flat Mining District (Table Rock Mining District)Mining District
Sierra Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
39° 41' 35'' North , 120° 50' 44'' West
Latitude & Longitude (decimal):
Locality 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.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity 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-localities

6 valid minerals.

Detailed Mineral List:

Chromite
Formula: Fe2+Cr3+2O4
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Galena
Formula: PbS
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Gold
Formula: Au
Localities: Reported from at least 25 localities in this region.
'Margarodite'
Reference: Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 275.
'Mariposite'
Formula: K(Al,Cr)2(Al,Si)4O10(OH)2
Reference: MacBoyle, Errol (1920b), Mines and mineral resources of Sierra County: California Mining Bureau Report 16, 144 pp. (published as separate chapter): 75; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 256; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 427.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: MacBoyle, Errol (1920b), Mines and mineral resources of Sierra County: California Mining Bureau Report 16, 144 pp. (published as separate chapter): 75; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 256; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 427.
Muscovite var: Phengite
Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Reference: MacBoyle, Errol (1920b), Mines and mineral resources of Sierra County: California Mining Bureau Report 16, 144 pp. (published as separate chapter): 75; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 256; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 427.
Pyrite
Formula: FeS2
Quartz
Formula: SiO2
Localities: Reported from at least 12 localities in this region.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Quartz4.DA.05SiO2
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Phengite9.EC.15KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Margarodite'-
'Mariposite'-K(Al,Cr)2(Al,Si)4O10(OH)2

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Margarodite'-
'Mariposite'-K(Al,Cr)2(Al,Si)4O10(OH)2
Muscovite
var: Phengite
-KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2

List of minerals for each chemical element

HHydrogen
H MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
OOxygen
O MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
O QuartzSiO2
O ChromiteFe2+Cr23+O4
O MuscoviteKAl2(AlSi3O10)(OH)2
O Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
MgMagnesium
Mg Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
AlAluminium
Al MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
SiSilicon
Si MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
Si QuartzSiO2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
SSulfur
S PyriteFeS2
S GalenaPbS
KPotassium
K MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
CrChromium
Cr MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
Cr ChromiteFe2+Cr23+O4
FeIron
Fe PyriteFeS2
Fe ChromiteFe2+Cr23+O4
Fe Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
AuGold
Au GoldAu
PbLead
Pb GalenaPbS

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.: 108-109.
MacBoyle, Errol (1920b), Sierra County, Poker Flat district, California Mining Bureau. Report 16, 144 pp.: 15-19.
Logan, Clarence August (1924), Nevada County, Gravel mines of Howland Flat Ridge, California Mining Bureau (Report 20): 362-367.
Logan, Clarence August (1929), Sierra County: placer mines: California Division of Mines (Report 25): 184-211.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 545.
Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 108-109.

Localities in this Region


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