Gwynfynydd Gold Mine
United Kingdom
Gwynfynydd Gold Mine is near Ganllwyd, Dolgellau, Gwynedd, Wales. The lode, which was discovered in 1860, was worked from 1884. It has produced more than 45,000 troy ounces of Welsh gold until mining ceased in 1998. The equivalent of 1,400 kg (£44, 871, 642 on 2017 markets).
Mine data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).