A mine that sends its gold, etc. away before subjecting it to the chemicals might be okay. An underground might be okay. But a toxic lake as high as the Grand Canyon is deep, and can be seen from space,  is not the kind of mine ole Jay had in mind, I rather doubt. That earthquake prone area, replete with Volcanoes and with rapidly changing conditions would be someone's job to take care of, and his son's job, and his daughter's, etc etc etc...forever. WTF? Mother Earth has had so many scars put upon her from Man, she is telling us with our climate change that she is fed up. No Pebble. Not now. Not ever.