Well, your Mountain Pass Mine is reopening this upcoming year. It appears to have passed most of the required regulations already. If they can match their previous output, this single mine alone will be able to supply a substantial fraction of China's current output. China has been tightening supply for a number of years now. While reopening mines is a long term project, we've had 2-5 years to begin reopening mines already (as Mountain Pass's progress shows).

http://en.wikipedia.org/wiki/Mountain_Pass_rare_earth_mine