In 1992 survey and excavation was carried out at three sites of early mine workings
previously identified during fieldwalking on the basis of their association with
primitive cobble stone tools.
At one of the sites a small opencut working and associated spoil mound (Site A) on
a copper vein had been partly inundated by peat along the earlier shoreline of the
“island” (or isthmus) previously surrounded by Borth Bog. A radiocarbon date of between
1745 and 1645 yrs cal BC was obtained from charcoal associated with fireset mine
waste and stone tools, whilst a small branch resting on top of the now waterlogged
mine spoil provided an Early Medieval date for the base of the overlying peat (Timberlake
These sites at Llancynfelin are interesting in that they show some evidence for systematic
prospecting (“pitting”) along the back of a vein which had been followed across the
summit of the “island” (sites A, B & C)
Possibly the same vein system was picked up by the prehistoric miners on the landward
side of the bog at Pwll Roman Mine, Taliesin. Stone mining tools were found at the
latter site by Simon Timberlake in 2004.
These sites around Borth Bog form one of the densest groupings of Bronze Age metal
mines in the UK.