Nice detective work!
Honestly, even if FLPC wasn't going to be the only Antimony mine in the US (Which, it sounds like it will be), it's still a ridiculously attractive opportunity, since it appears that Antimony is an endangered resource that is finding new uses in next-gen mobile tech for Samsung and Microsoft. I expect its value will continue to go up as it's used more and found less.
FLPC seems like a monster in the making!