An international team of archaeologists has excavated an ancient copper-production center at Khirbat en-Nahas down to virgin soil, through more than 20 feet of industrial smelting debris, or slag. The 2006 dig has brought up new artifacts and with them a new suite of radiocarbon dates placing the bulk of industrial-scale production at Khirbat en-Nahas in the 10th century BCE – in line with Biblical narrative on the rule of David and Solomon.
http://www.sciencedaily.com/releases/2008/10/081027174545.htm
http://news.nationalgeographic.com/news/2008/10/081028-king-solomon-copper-mine-missions.html
http://www.latimes.com/news/nationworld/world/la-sci-solomon28-2008oct28,0,1332762.story
To read the original paper in a PDF file, you may visit here:
http://magician.ucsd.edu/~ltauxe/CV/reprints/levy08.pdf