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Cid Mining District, Carolina Slate Belt, Davidson Co., North Carolina, USAi
Regional Level Types
Cid Mining DistrictMining District
Carolina Slate BeltBelt
Davidson Co.County
North CarolinaState
USACountry

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Key
Latitude & Longitude (WGS84):
35° North , 80° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~10km
Locality type:
Köppen climate type:


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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

30 valid minerals. 2 erroneous literature entries.

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!

Rock list contains entries from the region specified including sub-localities

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Alphabetical List Tree Diagram

Detailed Mineral List:

Acanthite
Formula: Ag2S
Reference: Genth,Frederick Augustus (1891) The Minerals Of North Carolina;USGS Bulletin No.74,pp.23
Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
Arsenopyrite
Formula: FeAsS
Reference: Carpenter III, P. Albert (1976) Metallic Mineral Deposits of the Carolina Slate Belt, North Carolina : NCGS Bulletion 84
Baryte
Formula: BaSO4
Reference: Former Steve Adams collection now Wayne Bowman collection, plus others.
Brochantite
Formula: Cu4(SO4)(OH)6
Description: Brochantite does not occur at Conrad Hill. I (Steve Adams) have not observed brochantite at this mine after half a century collecting there. I have regularly observed acicular malachite. The mine is very rich in carbonate but appears completely lacking in sulfates. Cited references do not mention brochantite.
Reference: Carpenter III, P. Albert (1976) Metallic Mineral Deposits of the Carolina Slate Belt, North Carolina : NCGS Bulletion 84 pg.23
Calcite
Formula: CaCO3
Cerussite
Formula: PbCO3
Habit: Small prismatic crystals and small clusters, the later almost always twinned.
Colour: Usually chalky dull white on surface from weathering, translucent grey-white interior.
Description: Likely more prevalent and better specimens in active mining days. Collecting on the small remaining dumps yielding obvious but not impressive specimens.
Reference: Keith Williamson collection, former Steve Adams collection (now in Wayne Bowman collection). Also collected by R.L. Stewart and others.
Chalcocite
Formula: Cu2S
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Chalcopyrite
Formula: CuFeS2
Localities: Reported from at least 8 localities in this region.
'Chert var: Novaculite' ?
Description: The cited reference gives a question mark after the term "novaculite". See my messageboard discussion for May 20, 2019. The rock is highly improbable to be sedimentary, hence a variety of chert - a strictly sedimentary rock term - does not fit. Rather the abundant material being referred to is almost certain to be rhyolite. The largely uniform light grey color reduces the amount of interest in it as a lapidary material, but it can and has been used for that.
Reference: Carpenter III, P. Albert (1976) Metallic Mineral Deposits of the Carolina Slate Belt, North Carolina : NCGS Bulletion 84
'Chlorite Group'
Covellite
Formula: CuS
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Cuprite
Formula: Cu2O
Description: The mine often has red ocherous hematite, but dense maroon masses associated with chalcopyrite and malachite long inspired my suspicion that they were at least in part cuprite. The presence of the mineral finally became confirmed when I observed a specimen in the collection of Guilford College from a field trip they took there in the 1960's. There were small patches of poor acicular "chalcotrichite" variety cuprite on a piece of cellular goethite. The mineral should be considered rare and of poor quality. I myself collected a micro later of very tiny red crystals on quartz - not impressive.
Reference: Guilford College Collection, former Steve Adams collection
Dolomite
Formula: CaMg(CO3)2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Ferrimolybdite ?
Formula: Fe2(MoO4)3 · nH2O
Reference: Carpenter III, P. Albert (1976) Metallic Mineral Deposits of the Carolina Slate Belt, North Carolina : NCGS Bulletion 84
Freibergite
Formula: (Ag,Cu,◻)10Fe2+2Sb4S12
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Galena
Formula: PbS
Goethite
Formula: α-Fe3+O(OH)
Description: Was recorded as Limonite. The identity of goethite as the species is visually quite obvious. The mineral occurs in two major modes. The main interest in goethite here is the black mammillary masses. Very nice cabinet display pieces were relatively common half a century ago (1960's) but are hard to come by now. The other mode is brown cellular cavity-ridden pseudomorphs after siderite retaining some of the rhombic orientation in the walls of cavities. The interest here is finding nice malachite crystals in the vugs. Furthermore, nice rhombic pseudomorphs of goethite after siderite crystals are somewhat common. A lot of the quartz at the mine has drusy crystal surfaces richly impregnated by goethite, making attractive sparkly brown pieces.
Reference: Pogue,J.E.,(1910)The Cid mining district of Davidison County,North Carolina:North Carolina Geological and Economic Survey Bulletin #22; Steve Adams
Gold
Formula: Au
Localities: Reported from at least 8 localities in this region.
Hematite
Formula: Fe2O3
Description: Hematite takes two modes at Conrad Hill: red ochre and black coarse platy. The platy is best described as "platy hematite" and does not resemble the variety "specularite". Tiny crystals are very rare and unimpressive, but they have been found. I (Steve Adams) found a few pieces with such crystals over many years of collecting there.
Reference: Luttrell,Gwendoly W.,(1978)Gold,base-metal,and related deposits of North Carolina :USGS Open File Report 78-152 pg.97 : Wilson,W.F and McKenzie,B.J (1980) Mineral Collecting Sites in North Carolina pg.30
Hematite var: Specularite
Formula: Fe2O3
Description: Hematite takes two modes at Conrad Hill: red ochre and black coarse platy. The platy is not aptly descriptive as "specularite". The material does not resemble the sparkly compact variety specularite and should be called platy hematite.
Reference: Pogue,J.E.,(1910) The Cid district of Davidison County,North Carolina, Steve Adams
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Carpenter III, P. Albert (1976) Metallic Mineral Deposits of the Carolina Slate Belt, North Carolina : NCGS Bulletion 84
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Malachite
Formula: Cu2(CO3)(OH)2
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
'Psilomelane'
Formula: Mn, O
Reference: Steve Adams collection, others, abundant black Mn oxide coatings
Pyrite
Formula: FeS2
Localities: Reported from at least 8 localities in this region.
Pyrite var: Auriferous Pyrite
Formula: FeS2
Description: See notes under pyrite. If pyrite actually is present, it would likely be auriferous. The chalcopyrite is definitely auriferous, which in fact made the mine profitable.
Reference: Pogue,J.E.,(1910) The Cid district of Davidison County,North Carolina, Steve Adams
Pyromorphite
Formula: Pb5(PO4)3Cl
Habit: Highly diverse. Includes tabular with basal pinacoids all the way to slender prismatic with complete pyramid faces. Some of the later had yellow equant second-generation crystals attached epitaxially to the long colorless prism - "corn on the cob"! Also "spindles", "barrels", "rice grains", and acicular spheroids.
Colour: Every color reported for the species. Shades of green of course, also water-clear colorless, beige, tan, yellow, orange, white. But of special interest is the unique carnation pink crystals. Unfortunately these appear to be due to F-centers or lattice voids and not a chromophore. So they quickly fade in the sunlight.
Description: See details under habits and colors. This is a much smaller mine than the nearby Silver Hill Mine. But this mine surpasses Silver Hill in the amazing diversity of colors and habits of the pyromorphite.
Reference: Genth,F.A.,and Kerr,W.C.,(1885)Minerals and Mineral Localities of North Carolina
Pyrrhotite
Formula: Fe7S8
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Quartz
Formula: SiO2
Localities: Reported from at least 7 localities in this region.
Quartz var: Milky Quartz
Formula: SiO2
Reference: Carpenter III, P. Albert (1976) Metallic Mineral Deposits of the Carolina Slate Belt, North Carolina : NCGS Bulletion 84
Siderite
Formula: FeCO3
Silver
Formula: Ag
Sphalerite
Formula: ZnS
Talc
Formula: Mg3Si4O10(OH)2
Reference: Pogue, J. E. Jr. (1910) The Cid Mining District of Davidson County, North Carolina: North Carolina Geological and Economic Survey (NCGS) Bulletin No.22. 144p.
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Acanthite2.BA.35Ag2S
Arsenopyrite2.EB.20FeAsS
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Covellite2.CA.05aCuS
Freibergite2.GB.05(Ag,Cu,◻)10Fe2+2Sb4S12
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
var: Auriferous Pyrite ?2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Cuprite4.AA.10Cu2O
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
var: Specularite ?4.CB.05Fe2O3
Quartz4.DA.05SiO2
var: Milky Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Ankerite5.AB.10Ca(Fe2+,Mg)(CO3)2
Calcite5.AB.05CaCO3
Cerussite5.AB.15PbCO3
Dolomite5.AB.10CaMg(CO3)2
Malachite5.BA.10Cu2(CO3)(OH)2
Siderite5.AB.05FeCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Brochantite7.BB.25Cu4(SO4)(OH)6
Ferrimolybdite ?7.GB.30Fe2(MoO4)3 · nH2O
Group 8 - Phosphates, Arsenates and Vanadates
Pyromorphite8.BN.05Pb5(PO4)3Cl
Group 9 - Silicates
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Talc9.EC.05Mg3Si4O10(OH)2
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Rocks, etc.
'Chert
var: Novaculite' ?
-
'Chlorite Group'-
'Limonite'-(Fe,O,OH,H2O)
'Psilomelane'-Mn, O

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
AmBnXp, with (m+n):p = 2:1
Acanthite2.4.1.1Ag2S
Chalcocite2.4.7.1Cu2S
AmXp, with m:p = 1:1
Covellite2.8.12.1CuS
Galena2.8.1.1PbS
Pyrrhotite2.8.10.1Fe7S8
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
3 <ø < 4
Freibergite3.3.6.3(Ag,Cu,◻)10Fe2+2Sb4S12
Group 4 - SIMPLE OXIDES
A2X
Cuprite4.1.1.1Cu2O
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Cerussite14.1.3.4PbCO3
Siderite14.1.1.3FeCO3
AB(XO3)2
Ankerite14.2.1.2Ca(Fe2+,Mg)(CO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)m(XO4)pZq, where m:p>2:1
Brochantite30.1.3.1Cu4(SO4)(OH)6
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Pyromorphite41.8.4.1Pb5(PO4)3Cl
Group 49 - HYDRATED MOLYBDATES AND TUNGSTATES
Hydrated Normal Molybdates and Tungstates
Ferrimolybdite ?49.2.1.1Fe2(MoO4)3 · nH2O
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Talc71.2.1.3Mg3Si4O10(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Chert
var: Novaculite' ?
-
'Chlorite Group'-
Hematite
var: Specularite ?
-Fe2O3
Kaolinite-Al2(Si2O5)(OH)4
'Limonite'-(Fe,O,OH,H2O)
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
'Psilomelane'-Mn, O
Pyrite
var: Auriferous Pyrite ?
-FeS2
Quartz
var: Milky Quartz
-SiO2

List of minerals for each chemical element

HHydrogen
H MalachiteCu2(CO3)(OH)2
H Goethiteα-Fe3+O(OH)
H Limonite(Fe,O,OH,H2O)
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H BrochantiteCu4(SO4)(OH)6
H KaoliniteAl2(Si2O5)(OH)4
H MuscoviteKAl2(AlSi3O10)(OH)2
H TalcMg3Si4O10(OH)2
H FerrimolybditeFe2(MoO4)3 · nH2O
CCarbon
C MalachiteCu2(CO3)(OH)2
C SideriteFeCO3
C AnkeriteCa(Fe2+,Mg)(CO3)2
C CalciteCaCO3
C DolomiteCaMg(CO3)2
C CerussitePbCO3
OOxygen
O MalachiteCu2(CO3)(OH)2
O SideriteFeCO3
O PyromorphitePb5(PO4)3Cl
O Goethiteα-Fe3+O(OH)
O QuartzSiO2
O AnkeriteCa(Fe2+,Mg)(CO3)2
O CalciteCaCO3
O DolomiteCaMg(CO3)2
O Limonite(Fe,O,OH,H2O)
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O HematiteFe2O3
O BrochantiteCu4(SO4)(OH)6
O KaoliniteAl2(Si2O5)(OH)4
O Quartz (var: Milky Quartz)SiO2
O MuscoviteKAl2(AlSi3O10)(OH)2
O TalcMg3Si4O10(OH)2
O BaryteBaSO4
O PsilomelaneMn, O
O CerussitePbCO3
O CupriteCu2O
O FerrimolybditeFe2(MoO4)3 · nH2O
O Hematite (var: Specularite)Fe2O3
MgMagnesium
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
Mg DolomiteCaMg(CO3)2
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Mg TalcMg3Si4O10(OH)2
AlAluminium
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al KaoliniteAl2(Si2O5)(OH)4
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si QuartzSiO2
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si KaoliniteAl2(Si2O5)(OH)4
Si Quartz (var: Milky Quartz)SiO2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si TalcMg3Si4O10(OH)2
PPhosphorus
P PyromorphitePb5(PO4)3Cl
SSulfur
S PyriteFeS2
S ChalcopyriteCuFeS2
S GalenaPbS
S PyrrhotiteFe7S8
S SphaleriteZnS
S ChalcociteCu2S
S Freibergite(Ag,Cu,◻)10Fe22+Sb4S12
S CovelliteCuS
S AcanthiteAg2S
S BrochantiteCu4(SO4)(OH)6
S ArsenopyriteFeAsS
S BaryteBaSO4
S Pyrite (var: Auriferous Pyrite)FeS2
ClChlorine
Cl PyromorphitePb5(PO4)3Cl
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
MnManganese
Mn PsilomelaneMn, O
FeIron
Fe SideriteFeCO3
Fe Goethiteα-Fe3+O(OH)
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe PyrrhotiteFe7S8
Fe Limonite(Fe,O,OH,H2O)
Fe Freibergite(Ag,Cu,◻)10Fe22+Sb4S12
Fe HematiteFe2O3
Fe ArsenopyriteFeAsS
Fe FerrimolybditeFe2(MoO4)3 · nH2O
Fe Hematite (var: Specularite)Fe2O3
Fe Pyrite (var: Auriferous Pyrite)FeS2
CuCopper
Cu MalachiteCu2(CO3)(OH)2
Cu ChalcopyriteCuFeS2
Cu ChalcociteCu2S
Cu Freibergite(Ag,Cu,◻)10Fe22+Sb4S12
Cu CovelliteCuS
Cu BrochantiteCu4(SO4)(OH)6
Cu CupriteCu2O
ZnZinc
Zn SphaleriteZnS
AsArsenic
As ArsenopyriteFeAsS
MoMolybdenum
Mo FerrimolybditeFe2(MoO4)3 · nH2O
AgSilver
Ag SilverAg
Ag Freibergite(Ag,Cu,◻)10Fe22+Sb4S12
Ag AcanthiteAg2S
SbAntimony
Sb Freibergite(Ag,Cu,◻)10Fe22+Sb4S12
BaBarium
Ba BaryteBaSO4
AuGold
Au GoldAu
PbLead
Pb PyromorphitePb5(PO4)3Cl
Pb GalenaPbS
Pb CerussitePbCO3

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