Just as a "for what it's worth..."

On topographical maps, a fence is shown by lines broken with x's.  In geological drawing, the same symbol is used, but it appears to begin from almost no place and ends soon connection nothing on its ends.  It usually represents a line of multiple drill holes. 

So, where multiple drill holes occur and are represented by a fence or fenceline on maps, they can cross multiple ownerships.  In this way, it is possible for multiple parties in the Robbers Roost area to make reference to past drilling by Asarco.  That does not distinguish who owns what, or even who has the best holes drilled.  

Again, best of luck to us all on this bit of "fairy dust".  I will not bet on it!

I will, however, bet big time on news of a partnership, though I am not holding my breath for that.