As I understand the situation, we have no plant operating in the US for the processing of rare earths.  That may be about to change in a big way.

https://www.globenewswire.com/news-release/2019/12/16/1960770/0/en/Texas-Mineral-Resources-and-USA-Rare-Earth-Announce-Commencement-of-Colorado-Based-Rare-Earth-and-Critical-Mineral-Pilot-Process-Development-Facility.html