Can Environment Sustain Quest for Valuable "Rare Earth" Materials?
![](https://www.sej.org/sites/default/files/USGS-RareEarthReport-tn.jpg)
A US Geological Survey report offers a perspective on the global situation and an assessment of known US deposits. There may be about 13 million metric tons available in 14 states — with the sites generally posing the usual environmental challenges associated with mining and refining.