Here is a video from the Molycorp site on Mountain Pass along the CA-NV border. Granted, it is a PR piece, but it is worth seeing regardless. To date, the Mountain Pass mine is the only significant Rare Earth Elements (REE) operation in the US.
There has been a large amount of REE exploration in North America in the past several years. I think the rush at Mountain Pass relates to more than just capturing market share from the Chinese. A large number of REE deposit discoveries could translate to excess capacity on the market in a few years. Especially if the economy recovers. As the cycle proceeds, only a few players will survive in North America.
More Molycorp PR-