China no longer accounts for all of the global REE supply due to increased production in the rest of the world. There are only four REE-specific mines that exist outside of China, two of which opened in the past year (other mines worldwide only produce REEs as a byproduct). These other mines are Mountain Pass in the United States, Mount Weld in Australia, Lovozero in Russia, and Kerala in India. However, these mines are not the only locations of REE deposits.
https://web.mit.edu/12.000/www/m2016/finalwebsite/solutions/deposits.html
Some others being developed:
UCORE, Bokan Range in Alaska;
NioCorp, Elk Creek Mine in Nebraska;
Texas Mineral Resources Corp, Roundtop mountain in Texas.
RioTinto has begun scandium mining in Canada.
There are other if you want to research them.