Paul Wong, 
Gold Certificates are a level of exchange that any commodity might be exchanged for including copper.  Pebble project includes Cu, Au, Ag, and more. The process to extract these elemental substances involves chemicals that are extremely toxic, and cannot be 100% safely contained. If an accident happens,  the toxics will destroy irreplaceable salmon spawning grounds. So what if a poster said gold instead of copper.  The locals will still be left to deal with the mess as so often happens.  I haven't seen where Pebble is willing to put up 50 Billion dollars to hedge against dumping an accident on the backs of Alaskans. Alaskans are not incorporated and can't escape behind the law and loopholes that allow such devastation to be resolved only in court after decades of dealing with the aftermath, if at all.