While I certainly could be confused about the 'ghost bridge' my assumption has been that this was the area seemingly headed towards FNC's property. If so then it was drill tested and at some depth with nothing much to show for the effort.

Diamoniferous pipes in the 'ROF', imho, are highly unlikely as others looked at area pretty hard and such deposits are likely outside of the ROF intrustion. Stranger things seem to be turning up so nothing wrong with crossing one's fingers.