American companies now rely mostly on Japan for magnets and other components using rare earth elements, as the United States’ manufacturing capacity in the industry became uncompetitive and mostly closed over the last two decades.
The Chinese halt to exports is likely to have immediate repercussions in Washington. The House Committee on Science and Technology is scheduled on Thursday morning to review a detailed bill to subsidize the revival of the American rare earths industry. The main American rare earths mine, in Mountain Pass, Calif., closed in 2002, but efforts are under way to reopen it.
Despite the name, rare earths are actually fairly common; they are expensive and seldom mined elsewhere because the processing equipment to separate them from the ore is expensive and because rare earths almost always occur naturally in deposits mixed with radioactive thorium and uranium. Processing runs the risk of radiation leaks
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