Molycorp Inc. in Mountain Pass, California, USAIn the past the rare earth plants in America were closed for the same reason why any mine or company close down...it had become uneconomical i.e. losing money!This was because at that time China was selling rare earth elements at a ridiculously low price and nobody could compete with them.Feb 22, 2012 :Molycorp Inc. said it will start up a newly const