The archipelago is named after Robinson Crusoe, but perhaps it should have been called Treasure Island. A long quest for booty from the Spanish colonial era appears to be culminating in Chile with the announcement by a group of adventurers that they have found an estimated 600 barrels of gold coins and Incan jewels on the remote Pacific island. "The biggest treasure in history has been located," said Fernando Uribe-Etxeverria, a lawyer for Wagner, the Chilean company leading the search. Mr Uribe-Etxeverria estimated the value of the buried treasure at US$10bn (£5.6bn). The announcement set off ownership claims. The treasure...