Gold is nothing if not patientcybernet: I respectfully disagree.
You can't turn back the clock and pretend Pebble was never discovered. People and governments will come and go, but the metal in the ground has been there for eons and it is not going anywhere.
It will still have value as long as there is even a glimmer of hope that a mine will someday be permitted. And considering the legal dispute with the EPA, the potential change in government, the ongoing effects of climate change, the growing crisis in the monetary system, the increasing price of gold, and numerous other factors - I would say the probability of that happening, while low, is much greater than many people realize.
In the meantime, you can't get much more dead than the stock has been. It will trade up and down on any big change in the gold price or any vague rumor about a settlement. But I doubt if it will become worthless. Only bankruptcy and a reorganization could do that, but that is another matter.