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Nant Helen opencast coal mine, Onllwyn, Neath-Port Talbot (West Glamorgan; Glamorgan), Wales, UK

UK Grid Reference: SN827113
Latitude: 51°47'15"N
Longitude: 3°42'3"W
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.

Mineral List

Ankerite
Calcite
Chalcopyrite
Dickite
Galena
Millerite
Pyrite
Quartz
Siderite
Siegenite
Sphalerite


11 entries listed. 11 valid minerals.

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Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 7th Jul 2011 11:47:38
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