Duke Island
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Duke Island is an island in the Gravina Islands of the Alexander Archipelago in the southeastern part of the U.S. state of Alaska. The island stands at , just north of the Canadian border. It is 19 km (12 miles) long and 13 km (8 miles) wide. Duke Island hosts an Alaskan-type ultramafic complex which is currently being explored for magmatic sulfide Cu-Ni-PGE deposits
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