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The Pebble exploration lands are located in an area of southwest Alaska that the U.S. Geological Survey has listed as the world's most extensive mineralized system.
In addition to geological mapping and geochemical surveys, induced polarization surveys (the principal tool that geologists use to identify copper-gold porphyry deposits) have been undertaken over much of the exploration lands. IP surveys led Northern Dynasty to identify at least four other deposit targets - all of which have been the focus of preliminary drilling programs.