Gwynfynydd
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Gwynfynydd Gold Mine at Dolgellau, North Wales, was discovered in 1860. It was active until 1998 and has produced 2,000+ troy ounces (62 kg) of Welsh gold since 1884. The mine, when open, was open to the public and provided guided tours which included the opportunity to pan for gold.
The mine closed because of geological difficulties in locating a sufficiently rich lode and because of changing pollution control legislation which would have made the owners liable for the quality of the mine discharge into the River Mawddach had the mine remained open.