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Allah Cooper Mine (Alley-Cooper Mine; Ali Cooper Mine; Valcooper Mine), Gold-Pyrite Belt, Louisa Co., Virginia, USA

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Key
Lock Map
Latitude & Longitude (WGS84): 38° 4' 26'' North , 77° 51' 34'' West
Latitude & Longitude (decimal): 38.07389,-77.85944
GeoHash:G#: dqb8s70kr
Locality type:Mine
Köppen climate type:Cfa : Humid subtropical climate


Commodities (Major) - Lead, Gold, Zinc; (Minor) - Silver; (Trace) - Sulfur - Iron Pyrite
Worked for gold and silver in the early 20th century, then for lead and zind from 1915 to 1918.
Deposit Model: 273: Low-sulfide Au-quartz vein
Host Rock Unit: Chopawamsic Formation
Structure: A Fracture Zone Thought To Be Present . Foliation Strikes N 30-35 Deg E And Dips Steeply To Se., Columbia Syncline , Ne-Sw Trend ; Reg.Trends: N. 30-35 Deg. E., Dipping Steeply Southeast
Host Rock: Biotite Gneiss, Schist
Tectonic Structure: Piedmont

The whole area surrounding the mine is being developed into a housing area. The mine might be bulldozed here very soon. Due to a very kind foreman, he let me explore the entire area. He informed me that some 20 mines occupied the property. I suspect that several of specimens recovered here in the past might be from nearby surrounding mine tailing piles. The actual Ali Cooper Mine is a very heavily mineralized lead and copper deposit and only nearby tailings at about 350 feet southwest contained pyromorphite and those associated minerals. This is private property, do not trespass or face fines and/or jail time!

Alternative Label Names

This is a list of additional names that have been recorded for mineral labels associated with this locality in the minID database. This may include previous versions of the locality name hierarchy from mindat.org, data entry errors, and it may also include unconfirmed sublocality names or other names that can only be matched to this level.

Allah Cooper Mine, Gold-Pyrite Belt, Louisa Co., Virginia, USA

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


29 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Anglesite
Formula: PbSO4
Reference: Minerals of Virginia 1990 by R. V. Dietrich
'Apatite Group'
Description: Generic name used to describe the unanalyzed crystals that have a clear orange to green color transition, presumably consisting of both vanadinite and pyromorphite
Reference: Weissman specimen
'Biotite gneiss'
Reference: From USGS MRDS database
Brochantite
Formula: Cu4(SO4)(OH)6
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Cerussite
Formula: PbCO3
Reference: L.E. Kearns and M.D. Dunn (2009) The 36th Rochester Mineralogical Symposium, April 23-26, programme abstracts, 17-18.
Chalcopyrite
Formula: CuFeS2
Reference: Minerals of Virginia, 1990 by R. V. Dietrich; Michael D. Dunn (2007) THE ALLAH COOPER (VALCOOPER) MINE REVISITED. Virginia Minerals Vol 50 No. 2
Galena
Formula: PbS
Reference: Minerals of Virginia, 1990 by R. V. Dietrich; Michael D. Dunn (2007) THE ALLAH COOPER (VALCOOPER) MINE REVISITED. Virginia Minerals Vol 50 No. 2
Gold
Formula: Au
Reference: Minerals of Virginia, 1990 by R. V. Dietrich; Michael D. Dunn (2007) THE ALLAH COOPER (VALCOOPER) MINE REVISITED. Virginia Minerals Vol 50 No. 2
'commodity:Gold'
Formula: Au
Reference: From USGS MRDS database
Hemimorphite
Formula: Zn4Si2O7(OH)2 · H2O
Reference: Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.
'commodity:Lead'
Formula: Pb
Reference: From USGS MRDS database
Leadhillite ?
Formula: Pb4(CO3)2(SO4)(OH)2
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Linarite
Formula: PbCu(SO4)(OH)2
Reference: Minerals of Virginia, 1990 by R. V. Dietrich; Michael D. Dunn (2007) THE ALLAH COOPER (VALCOOPER) MINE REVISITED. Virginia Minerals Vol 50 No. 2
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.
Melanterite
Formula: Fe2+(H2O)6SO4 · H2O
Reference: Minerals of Virginia, 1990 by R. V. Dietrich
Mottramite
Formula: PbCu(VO4)(OH)
Reference: Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: L.E. Kearns and M.D. Dunn (2009) The 36th Rochester Mineralogical Symposium, April 23-26, programme abstracts, 17-18.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: L.E. Kearns and M.D. Dunn (2009) The 36th Rochester Mineralogical Symposium, April 23-26, programme abstracts, 17-18.
Opal
Formula: SiO2 · nH2O
Reference: Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.
Pyrite
Formula: FeS2
Reference: Minerals of Virginia 1990 by R. V. Dietrich; Michael D. Dunn (2007) THE ALLAH COOPER (VALCOOPER) MINE REVISITED. Virginia Minerals Vol 50 No. 2
Pyromorphite
Formula: Pb5(PO4)3Cl
Reference: Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.; Michael D. Dunn (2007) THE ALLAH COOPER (VALCOOPER) MINE REVISITED. Virginia Minerals Vol 50 No. 2
Pyrophyllite
Formula: Al2Si4O10(OH)2
Reference: Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.; Michael D. Dunn (2007) THE ALLAH COOPER (VALCOOPER) MINE REVISITED. Virginia Minerals Vol 50 No. 2
Quartz
Formula: SiO2
Reference: Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.
Rozenite
Formula: FeSO4 · 4H2O
Reference: Minerals of Virginia 1990 by R. V. Dietrich
'Schist'
Reference: From USGS MRDS database
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.
Serpierite
Formula: Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Reference: L.E. Kearns and M.D. Dunn (2009) The 36th Rochester Mineralogical Symposium, April 23-26, programme abstracts, 17-18.
Silver
Formula: Ag
Reference: Minerals of Virginia 1990 by R. V. Dietrich
'commodity:Silver'
Formula: Ag
Reference: From USGS MRDS database
Smithsonite
Formula: ZnCO3
Reference: Minerals of Virginia 1990 by R. V. Dietrich
Sphalerite
Formula: ZnS
Reference: Minerals of Virginia, 1990 by R. V. Dietrich; Michael D. Dunn (2007) THE ALLAH COOPER (VALCOOPER) MINE REVISITED. Virginia Minerals Vol 50 No. 2
Vanadinite
Formula: Pb5(VO4)3Cl
Reference: Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.
Vauquelinite
Formula: Pb2Cu(CrO4)(PO4)(OH)
Reference: Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.
Wavellite
Formula: Al3(PO4)2(OH,F)3 · 5H2O
Reference: Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.
Wulfenite
Formula: Pb(MoO4)
Reference: Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.; Michael D. Dunn (2007) THE ALLAH COOPER (VALCOOPER) MINE REVISITED. Virginia Minerals Vol 50 No. 2

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Gold'1.AA.05Au
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
'Chalcopyrite'2.CB.10aCuFeS2
'Galena'2.CD.10PbS
'Pyrite'2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
'Magnetite'4.BB.05Fe2+Fe3+2O4
'Opal'4.DA.10SiO2 · nH2O
'Quartz'4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Cerussite'5.AB.15PbCO3
'Leadhillite' ?5.BF.40Pb4(CO3)2(SO4)(OH)2
'Malachite'5.BA.10Cu2(CO3)(OH)2
Smithsonite5.AB.05ZnCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Anglesite'7.AD.35PbSO4
'Brochantite'7.BB.25Cu4(SO4)(OH)6
'Linarite'7.BC.65PbCu(SO4)(OH)2
'Melanterite'7.CB.35Fe2+(H2O)6SO4 · H2O
'Rozenite'7.CB.15FeSO4 · 4H2O
Serpierite7.DD.30Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Vauquelinite7.FC.05Pb2Cu(CrO4)(PO4)(OH)
Wulfenite7.GA.05Pb(MoO4)
Group 8 - Phosphates, Arsenates and Vanadates
'Mottramite'8.BH.40PbCu(VO4)(OH)
'Pyromorphite'8.BN.05Pb5(PO4)3Cl
Vanadinite8.BN.05Pb5(VO4)3Cl
Wavellite8.DC.50Al3(PO4)2(OH,F)3 · 5H2O
Group 9 - Silicates
'Hemimorphite'9.BD.10Zn4Si2O7(OH)2 · H2O
'Muscovite'9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
'Pyrophyllite'9.EC.10Al2Si4O10(OH)2
'Schorl'9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Unclassified Minerals, Rocks, etc.
'Apatite Group'-
'Biotite gneiss'-
'Schist'-

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
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Cerussite14.1.3.4PbCO3
Smithsonite14.1.1.6ZnCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 17 - COMPOUND CARBONATES
Miscellaneous
Leadhillite ?17.1.2.1Pb4(CO3)2(SO4)(OH)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anglesite28.3.1.3PbSO4
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Melanterite29.6.10.1Fe2+(H2O)6SO4 · H2O
Rozenite29.6.6.1FeSO4 · 4H2O
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)m(XO4)pZq, where m:p>2:1
Brochantite30.1.3.1Cu4(SO4)(OH)6
(AB)2(XO4)Zq
Linarite30.2.3.1PbCu(SO4)(OH)2
Group 31 - HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)5(XO4)2Zq·xH2O
Serpierite31.6.2.1Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Mottramite41.5.2.2PbCu(VO4)(OH)
A5(XO4)3Zq
Pyromorphite41.8.4.1Pb5(PO4)3Cl
Vanadinite41.8.4.3Pb5(VO4)3Cl
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A3(XO4)2Zq·xH2O
Wavellite42.10.2.1Al3(PO4)2(OH,F)3 · 5H2O
Group 43 - COMPOUND PHOSPHATES, ETC.
Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
Vauquelinite43.4.3.1Pb2Cu(CrO4)(PO4)(OH)
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Wulfenite48.1.3.1Pb(MoO4)
Group 56 - SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
Si2O7 Groups and O, OH, F, and H2O with cations in [4] coordination
Hemimorphite56.1.2.1Zn4Si2O7(OH)2 · H2O
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Pyrophyllite71.2.1.1Al2Si4O10(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Unclassified Minerals, Rocks, etc.
'Apatite Group'-
'Biotite gneiss'-
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
'Schist'-

List of minerals for each chemical element

HHydrogen
H BrochantiteCu4(SO4)(OH)6
H HemimorphiteZn4Si2O7(OH)2 · H2O
H LeadhillitePb4(CO3)2(SO4)(OH)2
H LinaritePbCu(SO4)(OH)2
H MalachiteCu2(CO3)(OH)2
H MelanteriteFe2+(H2O)6SO4 · H2O
H MottramitePbCu(VO4)(OH)
H MuscoviteKAl2(AlSi3O10)(OH)2
H OpalSiO2 · nH2O
H PyrophylliteAl2Si4O10(OH)2
H RozeniteFeSO4 · 4H2O
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
H VauquelinitePb2Cu(CrO4)(PO4)(OH)
H WavelliteAl3(PO4)2(OH,F)3 · 5H2O
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
CCarbon
C CerussitePbCO3
C LeadhillitePb4(CO3)2(SO4)(OH)2
C MalachiteCu2(CO3)(OH)2
C SmithsoniteZnCO3
OOxygen
O AnglesitePbSO4
O BrochantiteCu4(SO4)(OH)6
O CerussitePbCO3
O HemimorphiteZn4Si2O7(OH)2 · H2O
O LeadhillitePb4(CO3)2(SO4)(OH)2
O LinaritePbCu(SO4)(OH)2
O MagnetiteFe2+Fe23+O4
O MalachiteCu2(CO3)(OH)2
O MelanteriteFe2+(H2O)6SO4 · H2O
O MottramitePbCu(VO4)(OH)
O MuscoviteKAl2(AlSi3O10)(OH)2
O OpalSiO2 · nH2O
O PyromorphitePb5(PO4)3Cl
O PyrophylliteAl2Si4O10(OH)2
O QuartzSiO2
O RozeniteFeSO4 · 4H2O
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
O SmithsoniteZnCO3
O VanadinitePb5(VO4)3Cl
O VauquelinitePb2Cu(CrO4)(PO4)(OH)
O WavelliteAl3(PO4)2(OH,F)3 · 5H2O
O WulfenitePb(MoO4)
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al PyrophylliteAl2Si4O10(OH)2
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al WavelliteAl3(PO4)2(OH,F)3 · 5H2O
SiSilicon
Si HemimorphiteZn4Si2O7(OH)2 · H2O
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si OpalSiO2 · nH2O
Si PyrophylliteAl2Si4O10(OH)2
Si QuartzSiO2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
PPhosphorus
P PyromorphitePb5(PO4)3Cl
P VauquelinitePb2Cu(CrO4)(PO4)(OH)
P WavelliteAl3(PO4)2(OH,F)3 · 5H2O
SSulfur
S AnglesitePbSO4
S BrochantiteCu4(SO4)(OH)6
S ChalcopyriteCuFeS2
S GalenaPbS
S LeadhillitePb4(CO3)2(SO4)(OH)2
S LinaritePbCu(SO4)(OH)2
S MelanteriteFe2+(H2O)6SO4 · H2O
S PyriteFeS2
S RozeniteFeSO4 · 4H2O
S SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
S SphaleriteZnS
ClChlorine
Cl PyromorphitePb5(PO4)3Cl
Cl VanadinitePb5(VO4)3Cl
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
CaCalcium
Ca SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
VVanadium
V MottramitePbCu(VO4)(OH)
V VanadinitePb5(VO4)3Cl
CrChromium
Cr VauquelinitePb2Cu(CrO4)(PO4)(OH)
FeIron
Fe ChalcopyriteCuFeS2
Fe MagnetiteFe2+Fe23+O4
Fe MelanteriteFe2+(H2O)6SO4 · H2O
Fe PyriteFeS2
Fe RozeniteFeSO4 · 4H2O
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
CuCopper
Cu BrochantiteCu4(SO4)(OH)6
Cu ChalcopyriteCuFeS2
Cu LinaritePbCu(SO4)(OH)2
Cu MalachiteCu2(CO3)(OH)2
Cu MottramitePbCu(VO4)(OH)
Cu SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Cu VauquelinitePb2Cu(CrO4)(PO4)(OH)
ZnZinc
Zn HemimorphiteZn4Si2O7(OH)2 · H2O
Zn SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Zn SmithsoniteZnCO3
Zn SphaleriteZnS
MoMolybdenum
Mo WulfenitePb(MoO4)
AgSilver
Ag SilverAg
AuGold
Au GoldAu
PbLead
Pb AnglesitePbSO4
Pb CerussitePbCO3
Pb GalenaPbS
Pb LeadhillitePb4(CO3)2(SO4)(OH)2
Pb LinaritePbCu(SO4)(OH)2
Pb MottramitePbCu(VO4)(OH)
Pb PyromorphitePb5(PO4)3Cl
Pb VanadinitePb5(VO4)3Cl
Pb VauquelinitePb2Cu(CrO4)(PO4)(OH)
Pb WulfenitePb(MoO4)

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Holocene
0 - 0.0117 Ma



ID: 2461917
quaternary alluvium

Age: Anthropocene (0 - 0.0117 Ma)

Description: Fine to coarse gravelly sand and sandy gravel, silt, and clay, light- to medium gray and yellowish gray; clasts consist mainly of vein quartz, quartzite, and other metamorphic rocks. Beds along the Potomac River and its tributaries south of the District of Columbia contain sparse brackish water clam shells as well as rare lenses of shells reworked from units as old as Paleocene. East of the Potomac River clasts of metamorphic rocks become much less abundant. Thickness typically 1 to 6.5 m (2 to 2- ft), but can be as much as 15 m (50 ft). North of the Hybla Valley in Virginia, as well as in Maryland and the District of Columbia, Qal includes Qm and Qsp. West of the Coastal Plain province, locally contains terrace deposits.

Comments: tan; thin,medium,thick; quartz; Dominant bedding; fluvial, modern creeks and rivers; sand and gravel

Lithology: Gravel

Reference: Davis, A.M., C.S. Southworth, J.E. Reddy, J.S. Schindler. Geologic Map Database of the Washington DC Area Featuring Data from Three 30 x 60 Minute Quadrangles: Frederick, Washington West, and Fredericksburg. U.S. Geological Survey Open-File Report 01-227. [70]

Cambrian
485.4 - 541 Ma



ID: 2767956
Chopawamsic Formation - Interlayered felsic and mafic metavolcanic rocks

Age: Cambrian (485.4 - 541 Ma)

Stratigraphic Name: Chopawamsic Formation

Description: Chopawamsic Formation, undivided, (Pavlides, 1981). Includes laterally discontinuous lenses and tongues of metamorphosed felsic, intermediate, and mafic volcanic flows and volcanoclastic rocks, with interlayered quartzite, quartzose graywacke, schist, and phyllite. Volcanic flows are locally highly vesicular; fragmental breccia and tuff are common. Felsic flows are typically light-gray aphanitic rocks with phenocrysts of quartz and feldspar; intermediate flows are dark-green amphibole-bearing rocks with fine-grained quartz-feldspar matrix; greenstone metabasalts contain blue green amphibole, chlorite, albitic plagioclase, and quartz. Geophysical signature: linear strike-elongate pattern of elevated magnetic anomalies. The Chopawamsic is correlated with the James Run Formation in Maryland; the James Run has been dated at 570 to 530 Ma (U-Pb zircon; Tilton and others 1970). The Chopawamsic is unconformably overlain by the Late Ordovician Arvonia and Quantico Formations. Pavlides (1981 and subsequent works) has made the interpretation on the basis of geologic and geochemical data that the Chopawamsic and related plutons represent an ancient is land-arc sequence.

Comments: Central Virginia Volcanic-Plutonic Belt Original map source: Virginia Division of Mineral Resources, 2003, Digital Representation of the 1993 Geologic Map of Virginia, Publication 174, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, scale 1:500,000.

Lithology: Major:{metavolcanic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Cambrian
485.4 - 541 Ma



ID: 2459197
Chopawamsic Formation

Age: Cambrian (485.4 - 541 Ma)

Stratigraphic Name: Chopawamsic Formation

Description: Consists of lenses and tongues of metavolcanic, metasedimentary rocks, amphibolite greenstone and dark schist (island-arc terrane)

Lithology: Metavolcanics

Reference: Davis, A.M., C.S. Southworth, J.E. Reddy, J.S. Schindler. Geologic Map Database of the Washington DC Area Featuring Data from Three 30 x 60 Minute Quadrangles: Frederick, Washington West, and Fredericksburg. U.S. Geological Survey Open-File Report 01-227. [69]

Cambrian
485.4 - 541 Ma



ID: 3185964
Paleozoic volcanic rocks

Age: Cambrian (485.4 - 541 Ma)

Lithology: Volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Grosh, W. A. (1949), Investigation of the Allah Cooper lead-zinc mine, Louisa County, VA: U S Bureau of Mines Report of Investigation 4604, 6 pp.
Poole, J. L. (1974), Notes on Some Abandoned Copper, Lead, and Zinc Mines in the Piedmont of.....
Dunn, Michael D. (2007), The Allah Cooper (Valcooper) Mine Revisited. Virginia Minerals: 50(2).
Kearns, L.E. and M.D. Dunn (2009), The 36th Rochester Mineralogical Symposium, April 23-26, programme abstracts, 17-18.


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