Federal geologists mining old Western US tailings piles for minerals to build smartphones

  • by: TRACIE CONE , Associated Press
  • Updated: July 21, 2013 - 2:15 PM

SACRAMENTO, Calif. — Across the West, early miners digging for gold, silver and copper had no idea that one day something else very valuable would be buried in the piles of dirt and rocks they tossed aside.

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