Nant Yr Eira is a remote lead and copper mine high on the slopes of Plynlimon in west Montgomeryshire. The earliest working here is the deep open-cut (95 metres long by 6 metres wide and 7 metres deep
In June 1986, the Bureau of Reclamation awarded a three-year contract for historical archaeological studies as part of the mitigation program for the Central Arizona Project's Regulatory Storage Divis