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Laowan Au deposit, Tongbai County, Nanyang, Henan, Chinai
Regional Level Types
Laowan Au depositDeposit
Tongbai CountyCounty
NanyangPrefecture-level City
HenanProvince
ChinaCountry

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Latitude & Longitude (WGS84):
32° 28' 30'' North , 113° 21' 29'' East
Latitude & Longitude (decimal):
Type:
Mindat Locality ID:
64746
Long-form identifier:
mindat:1:2:64746:0
GUID (UUID V4):
18cfbf8b-76db-4214-8910-c4edcc19f243
Name(s) in local language(s):
老湾金矿, 桐柏县, 南阳市, 河南省, 中国


Metamorphic clastic rock-type gold deposit.

The Laowan gold deposit is hosted by the amphibolites and mica
schists from the Guishan Formation. Gold mineralization mainly occurs as dissemination in the altered amphibolite and mica schist, as well as in quartz veins within the Guishan Formation.
Five paragenetic stages have been distinguished with gradually decrease temperature, determined by homogenization temperature of fluid inclusions: (1) metamorphic-diagenetic stage with anhedral pyrite (Py 0) disseminated sparsely along the foliation of wall rocks of the Guishan Formation, (2) pre-ore stage (pyrite I, 337–348°C), which consists of euhedral pyrite (Py I) sparsely disseminated in the early milky quartz veins with no visible gold, and very low gold grades, (3) quartz-pyrite stage (pyrite II – chalcopyrite – gold, 240–256°C), composed of coarse-grained subhedral pyrite (Py II) corroded and veined by chalcopyrite which contains grains of native gold broadly disseminated in smoky-grey quartz veins, (4) quartz-polymetallic sulfide stage (pyrite III – chalcopyrite – galena – sphalerite – tetrahedrite – gold, 210–225°C), characterized by the replacement of subhedral Py II by gold-containing chalcopyrite-tetrahedrite, which is paragenetic with euhedral Py III and which was later corroded and replaced by galena and sphalerite, (5) late quartz-carbonate stage (153°C) of alteration with no gold mineralization.

The Laowan lode-type gold deposit (>208 t Au), controlled by fault zones, is hosted by Mesoproterozoic metamorphic rock of the Guishan Formation (Pt2g) of the Tongbai orogen, China. It comprises the Shangshanghe and Laowan ore segments, which are less than 800 m away from each other. Three types of gold mineralization can be identified, including pyrite-dissminated altered rock type, pyrite-laminated quartz vein and subordinated by massive polymetallic sulfide type.

Select Mineral List Type

StandardDetailedGalleryStrunzChemical Elements

Detailed Mineral List:

Altaite
Formula:PbTe
'Amphibole Supergroup'
Formula:AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Apatite'
Formula:Ca5(PO4)3(Cl/F/OH)
Arsenopyrite
Formula:FeAsS
'Biotite'
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Calcite
Formula:CaCO3
References:
Chalcopyrite
Formula:CuFeS2
References:
'Chlorite Group'
Epidote
Formula:(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
References:
Galena
Formula:PbS
References:
'Garnet Group'
Formula:X3Z2(SiO4)3
Gold
Formula:Au
References:
Gold var. Electrum
Formula:(Au,Ag)
Hedleyite
Formula:Bi7Te3
Hessite
Formula:Ag2Te
'Hornblende Root Name Group'
Formula:◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
'K Feldspar'
Magnetite
Formula:Fe2+Fe3+2O4
'Monazite Group'
Formula:REE(PO4)
Muscovite
Formula:KAl2(AlSi3O10)(OH)2
References:
Muscovite var. Sericite
Formula:KAl2(AlSi3O10)(OH)2
References:
Petzite
Formula:Ag3AuTe2
Pilsenite
Formula:Bi4Te3
'Plagioclase'
Formula:(Na,Ca)[(Si,Al)AlSi2]O8
Pyrite
Formula:FeS2
References:
Quartz
Formula:SiO2
References:
Quartz var. Milky Quartz
Formula:SiO2
Rutile
Formula:TiO2
Saddlebackite
Formula:Pb2Bi2Te2S3
Sphalerite
Formula:ZnS
References:
Stützite
Formula:Ag5-xTe3, x = 0.24-0.36
'Tennantite-Tetrahedrite Series'
'Tetrahedrite Subgroup'
Formula:Cu6(Cu4C2+2)Sb4S12S
Titanite
Formula:CaTi(SiO4)O
Tsumoite
Formula:BiTe
Volynskite
Formula:AgBiTe2
'Xenotime'
Zircon
Formula:Zr(SiO4)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold
var. Electrum
1.AA.05(Au,Ag)
1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Hessite2.BA.60Ag2Te
Stützite2.BA.65Ag5-xTe3, x = 0.24-0.36
Petzite2.BA.75Ag3AuTe2
Sphalerite2.CB.05aZnS
Chalcopyrite2.CB.10aCuFeS2
Altaite2.CD.10PbTe
Galena2.CD.10PbS
Hedleyite2.DC.05Bi7Te3
Pilsenite2.DC.05Bi4Te3
Tsumoite2.DC.05BiTe
Pyrite2.EB.05aFeS2
Arsenopyrite2.EB.20FeAsS
'Tetrahedrite Subgroup'2.GB.05Cu6(Cu4C2+2)Sb4S12S
Saddlebackite2.GC.40dPb2Bi2Te2S3
Volynskite2.JA.20AgBiTe2
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
var. Milky Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Zircon9.AD.30Zr(SiO4)
Titanite9.AG.15CaTi(SiO4)O
Epidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified
'Amphibole Supergroup'-AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
'Chlorite Group'-
'Tennantite-Tetrahedrite Series'-
'Monazite Group'-REE(PO4)
'Xenotime'-
'Hornblende Root Name Group'-◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
'K Feldspar'-
'Garnet Group'-X3Z2(SiO4)3
'Apatite'-Ca5(PO4)3(Cl/F/OH)

List of minerals for each chemical element

HHydrogen
HAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
HBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
HEpidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
HMuscoviteKAl2(AlSi3O10)(OH)2
HHornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
HMuscovite var.SericiteKAl2(AlSi3O10)(OH)2
HApatiteCa5(PO4)3(Cl/F/OH)
CCarbon
CCalciteCaCO3
OOxygen
OAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
OBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
OCalciteCaCO3
OEpidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
OMagnetiteFe2+Fe23+O4
OMonazite GroupREE(PO4)
OMuscoviteKAl2(AlSi3O10)(OH)2
OQuartzSiO2
ORutileTiO2
OTitaniteCaTi(SiO4)O
OZirconZr(SiO4)
OQuartz var.Milky QuartzSiO2
OHornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
OMuscovite var.SericiteKAl2(AlSi3O10)(OH)2
OPlagioclase(Na,Ca)[(Si,Al)AlSi2]O8
OGarnet GroupX3Z2(SiO4)3
OApatiteCa5(PO4)3(Cl/F/OH)
FFluorine
FAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
FBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FHornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
FApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
NaPlagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
MgBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlAluminium
AlAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
AlBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlEpidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
AlMuscoviteKAl2(AlSi3O10)(OH)2
AlHornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
AlMuscovite var.SericiteKAl2(AlSi3O10)(OH)2
AlPlagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
SiAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
SiBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
SiEpidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
SiMuscoviteKAl2(AlSi3O10)(OH)2
SiQuartzSiO2
SiTitaniteCaTi(SiO4)O
SiZirconZr(SiO4)
SiQuartz var.Milky QuartzSiO2
SiHornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
SiMuscovite var.SericiteKAl2(AlSi3O10)(OH)2
SiPlagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiGarnet GroupX3Z2(SiO4)3
PPhosphorus
PMonazite GroupREE(PO4)
PApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
SArsenopyriteFeAsS
SChalcopyriteCuFeS2
SGalenaPbS
SPyriteFeS2
SSphaleriteZnS
STetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
SSaddlebackitePb2Bi2Te2S3
ClChlorine
ClAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ClHornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
ClApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
KBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
KMuscoviteKAl2(AlSi3O10)(OH)2
KMuscovite var.SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
CaCalciteCaCO3
CaEpidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
CaTitaniteCaTi(SiO4)O
CaHornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
CaPlagioclase(Na,Ca)[(Si,Al)AlSi2]O8
CaApatiteCa5(PO4)3(Cl/F/OH)
TiTitanium
TiAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
TiBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
TiRutileTiO2
TiTitaniteCaTi(SiO4)O
FeIron
FeArsenopyriteFeAsS
FeBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeChalcopyriteCuFeS2
FeEpidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
FeMagnetiteFe2+Fe23+O4
FePyriteFeS2
CuCopper
CuChalcopyriteCuFeS2
CuTetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
ZnZinc
ZnSphaleriteZnS
AsArsenic
AsArsenopyriteFeAsS
ZrZirconium
ZrZirconZr(SiO4)
AgSilver
AgGold var.Electrum(Au,Ag)
AgHessiteAg2Te
AgPetziteAg3AuTe2
AgStütziteAg5-xTe3, x = 0.24-0.36
AgVolynskiteAgBiTe2
SbAntimony
SbTetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
TeTellurium
TeAltaitePbTe
TeHedleyiteBi7Te3
TeHessiteAg2Te
TePetziteAg3AuTe2
TePilseniteBi4Te3
TeStütziteAg5-xTe3, x = 0.24-0.36
TeTsumoiteBiTe
TeVolynskiteAgBiTe2
TeSaddlebackitePb2Bi2Te2S3
AuGold
AuGold var.Electrum(Au,Ag)
AuGoldAu
AuPetziteAg3AuTe2
PbLead
PbAltaitePbTe
PbGalenaPbS
PbSaddlebackitePb2Bi2Te2S3
BiBismuth
BiHedleyiteBi7Te3
BiPilseniteBi4Te3
BiTsumoiteBiTe
BiVolynskiteAgBiTe2
BiSaddlebackitePb2Bi2Te2S3

Other Regions, Features and Areas containing this locality

AsiaContinent
China
China
Eurasian Plate
Yangtze PlateTectonic Plate

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