I”m quoting part of your comment here: I am not sure why the sale of mineral rights would mean a rancher would lose access to his BLM rights. The government leases BLM land and could raise the price and he could protest like those crazy guys who did that stand-off and went to jail. The owner of the mining company could have an illegal scheme not related to mining that he wants to hide from prying eyes, but he’d have to bribe someone in the Interior department government to deny the hero’s lease.
It takes a LONG time between the time a company buys the mineral rights until they can actually begin mining. If they do find enough minerals to justify the cost of mining, yes, the rancher would have to evacuate the land and would lose all access.