Llechwedd Helyg mine, developed a section of the Camdwr fault system, which is recorded as being up to 9 mts wide here. The mine was worked befor 1853, when it was reopened. The mine continued to be worked until 1862, with only 3 tons of lead ore being recorded for this 10 year period.
The mine produced some of mid-Wales best examples of malachite, for a short time from the dumps.
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UK OS Grid Reference: SN683847
Map Reference: 52°26'38"N , 3°56'16"W
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