gwg.v ucu.v cce.v on the tsx venture exchange. All have had great moves since July so I would be careful about buying here. Rare earth metals aren't actually that rare. Production is now in China because they under priced everyone else but their recent tightening on supply is likely to stimulate new mine projects and the reopening of old mines.
I suggest using the charts to find good entry points based on history etc.
I recommended ucu.v (Ucore) on this board a while back along with Copper Fox and Western Lithium when you asked about interesting mine projects. All have had great moves since.