Mountain Pass rare earth mine
... that the Mountain Pass rare earth mine was the largest mine for rare earth metals in the 1970s and 1980s?
... that the <b id="mwFjY"><a class="mw-redirect" href="./Mountain_Pass_rare_earth_mine" id="mwFjc" rel="mw:WikiLink" title="Mountain Pass rare earth mine">Mountain Pass rare earth mine</a></b> was the largest mine for <a class="mw-redirect" href="./Rare_earth_metals" id="mwFjg" rel="mw:WikiLink" title="Rare earth metals">rare earth metals</a> in the 1970s and 1980s?