A post in the GENEALOGY-DNA-L gives some additional information from the scientists working on this:
We are following up on the Weale study (Mol. Biol. Evol. 19(7):1008-1021. 2002) which reported a much higher than average number of E3b individuals inThe 2002 study had found a high frequency of HG21 in Abergele. It will be interesting to see which subclade of E3b (or E1b1b in the updated terminology) the NW Wales men belong to. If they do belong to E-V13, then this would be consistent with a Bronze Age origin, although this would be difficult to distinguish from other scenaria, e.g., the arrival of this haplogroup with the Romans.
Abergele. We are interested in the possibility that these may be linked to
the Bronze age copper mines nearby, but obviously this is just one
possibility. The first step is to see if we can replicate the findings of
the 2002 study in a much larger sample.
Also of interest: The Litoroid Race in the Bronze Age.
DNA test to prove Bronze Age link
Men are needed for DNA tests to prove their distant ancestors moved from the Mediterranean to north west Wales as migrant workers 4,000 years ago.
Researchers at the University of Sheffield hope to link the migration of men in the Bronze Age to the discovery of copper.
The metal was found at both Parys Mountain on Anglesey, and on the Great Orme at Llandudno, Conwy.
The researchers are building on previous work carried out in the area which found a much higher-than-average presence of a DNA marker that is commonly found in people from the Balkans and Spain.