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Nant Helen opencast coal mine, Onllwyn, Neath Port Talbot, Wales, UKi
Regional Level Types
Nant Helen opencast coal mineMine
Onllwyn- not defined -
Neath Port TalbotCounty Borough
WalesCountry
UKCountry

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Key
Latitude & Longitude (WGS84):
51° 47' 15'' North , 3° 42' 3'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SN827113
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Coelbren537 (2017)2.2km
Seven Sisters2,123 (2017)2.6km
Ystalyfera10,218 (2011)6.0km
Glyn-neath5,419 (2017)7.2km
Crynant1,602 (2017)7.3km
Other/historical names associated with this locality:
West Glamorgan; Glamorgan


Large open-cast coal mine on the northern outcrop of the south Wales coalfield. Many specimens were recovered from joint surfaces in thick (1-1.5 m) sandstones layered between shales and coal seams exposed in the late 1990s. Ankerite and quartz was particularly common, other minerals much less so.

The original 1990s opencast has subsequently been backfilled and a second massive opencast working the same beds has been opened close by.

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


11 valid minerals.

Detailed Mineral List:

Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
Description: Xls to 1.5cms
Reference: National Museum of Wales Mineral Database (EDX analysis T.F. Cotterell, unpublished data)
Calcite
Formula: CaCO3
Chalcopyrite
Formula: CuFeS2
Description: Xls to 5mm
Reference: No reference listed
Dickite
Formula: Al2(Si2O5)(OH)4
Galena
Formula: PbS
Description: Xls to 2mm
Reference: No reference listed
Millerite
Formula: NiS
Description: Xl mats to several cms
Reference: No reference listed
Pyrite
Formula: FeS2
Description: Xls to 1mm
Reference: No reference listed
Quartz
Formula: SiO2
Description: Xls to 5cms
Reference: No reference listed
Siderite
Formula: FeCO3
Description: Xls to 6mm
Reference: No reference listed
Siegenite
Formula: CoNi2S4
Description: Xls to 0.5mm
Reference: No reference listed
Sphalerite
Formula: ZnS
Reference: No reference listed

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Millerite2.CC.20NiS
Pyrite2.EB.05aFeS2
Siegenite2.DA.05CoNi2S4
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Ankerite5.AB.10Ca(Fe2+,Mg)(CO3)2
Calcite5.AB.05CaCO3
Siderite5.AB.05FeCO3
Group 9 - Silicates
Dickite9.ED.05Al2(Si2O5)(OH)4

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Millerite2.8.16.1NiS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 3:4
Siegenite2.10.1.6CoNi2S4
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Siderite14.1.1.3FeCO3
AB(XO3)2
Ankerite14.2.1.2Ca(Fe2+,Mg)(CO3)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Dickite71.1.1.1Al2(Si2O5)(OH)4
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2

List of minerals for each chemical element

HHydrogen
H DickiteAl2(Si2O5)(OH)4
CCarbon
C AnkeriteCa(Fe2+,Mg)(CO3)2
C SideriteFeCO3
C CalciteCaCO3
OOxygen
O AnkeriteCa(Fe2+,Mg)(CO3)2
O QuartzSiO2
O SideriteFeCO3
O CalciteCaCO3
O DickiteAl2(Si2O5)(OH)4
MgMagnesium
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
AlAluminium
Al DickiteAl2(Si2O5)(OH)4
SiSilicon
Si QuartzSiO2
Si DickiteAl2(Si2O5)(OH)4
SSulfur
S ChalcopyriteCuFeS2
S GalenaPbS
S MilleriteNiS
S PyriteFeS2
S SiegeniteCoNi2S4
S SphaleriteZnS
CaCalcium
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
Ca CalciteCaCO3
FeIron
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe SideriteFeCO3
CoCobalt
Co SiegeniteCoNi2S4
NiNickel
Ni MilleriteNiS
Ni SiegeniteCoNi2S4
CuCopper
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
PbLead
Pb GalenaPbS

Other Regions, Features and Areas containing this locality

British IslesGroup of Islands
Eurasian PlateTectonic Plate
EuropeContinent
UK

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
 
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