Stock Photo - Wolfgang Voss from Federal Institute for Geosciences and Natural Resources (BGR) prepares a probe for the hunt for raw materials using a helicopter in Geyer, Germany, 22 October 2013. They will be searching the area from the air for raw materials like tin, tungsten, zink and indium using an electromagnetic signal that can penetrate into the ground. Photo: HENDRIK SCHMIDT | usage worldwide. - Geyer/Saxony/Germany

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