It seems that researchers have pulled 39 ingots of the ore from a ship wreck of the coast of Sicily. The ship sank not far from shore some 2600 years ago, probably destroyed by Poseidon in his rage over the loss of Atlantis, or maybe these were refugees from the dying city. Maybe they were just merchants carrying the stuff to market and foundered. Who can say (though I'm going with the Poseidon angle)?
Regardless, check the story out linked above, its pretty cool.