If push came to shove those mines would be operating inside of a month. The IP is still there. And by push come to shove I don't mean these minerals to build our fancy shmancy desktops. But those that go inside advanced weapon systems. We'd get it done and to hell with the environment.
Unless you work in the mineral exploration or mining industries you don't know what you are talking about.
The IP I refer to is not only the metallurgical techniques but also the use of the material.
Neodymium magnet manufactures do not exist outside of china anymore and that is the key component that the military uses for their bombs.
That is only one of the technologies critical for the military.