China's control over the rare earths market hasn't faced too many challenges over the past few years, but that may be changing, thanks to a major discovery in Japan. Geologists say they've uncovered expansive new deposits of rare earth minerals, buried within a seabed some 20,000 feet below the Pacific Ocean surface. Research leader Yasuhiro Kato estimates that the deposits contain anywhere from 80 to 100 billion metric tons of rare earths, which, if commercially viable, could pose a serious threat to China's
