Nant Helen opencast coal mine, Onllwyn, Neath Port Talbot, Wales, UKi
| Regional Level Types | |
|---|---|
| Nant Helen opencast coal mine | Open-Cast Mine (Backfilled) |
| Onllwyn | Community |
| Neath Port Talbot | County Borough |
| Wales | Country |
| UK | Country |
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Latitude & Longitude (WGS84):
51° 47' 15'' North , 3° 42' 3'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SN827113
Type:
Open-Cast Mine (Backfilled) - last checked 2020
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Coelbren | 537 (2017) | 2.2km |
| Seven Sisters | 2,123 (2017) | 2.6km |
| Ystalyfera | 10,218 (2011) | 6.0km |
| Glyn-neath | 5,419 (2017) | 7.2km |
| Crynant | 1,602 (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 Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
12 valid minerals.
Detailed Mineral List:
| ⓘ Ankerite Formula: Ca(Fe2+,Mg)(CO3)2 Description: Xls to 1.5cms |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Chalcopyrite Formula: CuFeS2 Description: Xls to 5mm |
| ⓘ Dickite Formula: Al2(Si2O5)(OH)4 |
| ⓘ Dolomite Formula: CaMg(CO3)2 References: Tom Cotterell collection.Identification: Visual Identification |
| ⓘ Dolomite var. Iron-bearing Dolomite Formula: Ca(Mg,Fe)(CO3)2 References: Tom Cotterell collection.Identification: Visual Identification |
| ⓘ Galena Formula: PbS Description: Xls to 2mm |
| ⓘ Millerite Formula: NiS Description: Xl mats to several cms |
| ⓘ Pyrite Formula: FeS2 Description: Xls to 1mm |
| ⓘ Quartz Formula: SiO2 Description: Xls to 5cms |
| ⓘ Siderite Formula: FeCO3 Description: Xls to 6mm |
| ⓘ Siegenite Formula: CoNi2S4 Description: Xls to 0.5mm |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Millerite | 2.CC.20 | NiS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Siegenite | 2.DA.05 | CoNi2S4 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Siderite | 5.AB.05 | FeCO3 |
| ⓘ | Ankerite | 5.AB.10 | Ca(Fe2+,Mg)(CO3)2 |
| ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| ⓘ | var. Iron-bearing Dolomite | 5.AB.10 | Ca(Mg,Fe)(CO3)2 |
| Group 9 - Silicates | |||
| ⓘ | Dickite | 9.ED.05 | Al2(Si2O5)(OH)4 |
List of minerals for each chemical element
Other Regions, Features and Areas containing this locality
British and Irish IslesGroup of Islands
Eurasian PlateTectonic Plate
- AvaloniaVolcanic Arc
EuropeContinent
UK
- Wales
- Cambrian MountainsMountain Range
- Glamorgan
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Nant Helen opencast coal mine, Onllwyn, Neath Port Talbot, Wales, UK