Miners work at the Tres Marias zinc and germanium Mine in Chihuahua, Mexico, February 28, 2008. Prospectors deep in the arid desert of northern Mexico are searching for tiny traces of germanium, a minor metal whose price is booming due to high U.S. military spending and export controls by China. Picture taken February 28, 2008. REUTERS/Tomas Bravo (MEXICO) (Bloomberg) — China’s decision to control the export of two key metals showed it has some power to retaliate against moves by the US, Japan and Europe to cut Beijing off from advanced technology. But it also risks backfiring. Most Read from...