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A letter in the Mining Journal of 1869 refers to the Penprompren Mines (probably including Erglodd) where ancient miners had exploited lead and copper
ores using stone tools at numerous locations at the intersections of a network of shallow veins.
One of these opencuts is still visible today.
A small part of the site was excavated by the EMRG in June 2005.
The mine is close to the site the Roman lead smelting site which was excavated by Cambria Archaeology in 2005.
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