Fodder?  I think this is a nonstory.

https://roskill.com/news/rare-earths-mountain-pass-sold-chinese-led-consortium/

The US has plenty of rare earths.  However, China positioned itself to be the worlds major supplier, and they did so in other areas as well (by subsidizing those industries).  Does that lead to fair trade?  No, it is the first step toward trade wars but without the imposition of tariffs. 

There may be a lag time for us to create all the rare earths we need without China in the supply chain, but we have it, especially if free-market pricing is allowed to prevail. 

As far as what Hay Mountain may contribute, those possible ores are very deep and will be among the last to be extracted.  Let's focus on copper, gold, and moly for now.