The Pebble Mine would be required to operate under the same strict guidelines as all of the other mines in AK. The largest share of my income comes from active mines, mine closures, heap leach pads, and remediation work. Mines are operated as tightly as most Dept. of Energy Nuclear sites. Regulatory agencies are on site full time and waiting to stop work at the slightest sniff of a violation. There are always the doom and gloom potential although, NOT cleaning up the existing mines which operated through the 1960's with horrible environmental practices is far a greater injustice to the environment than opening a new mine operating with modern environmental protections and operation practices.
The "good" about gaining our resources domestically is that we have "Standards" compared to those operated in South America and Africa. Those employ borderline slave labor, have zero environmental care and are just out to turn ore to make quick money while the initial investors prepare to walk away. Having a mine generating jobs in a semi-responsible manner using modern technology is far better than mining in third world countries when it comes down to a truly "global" green perspective.