This piece is posted in the Opinion section ... and since it is written by the CEO of the Pebble mine, that is quite appropriate.
He cites facts that one should be able to verify elsewhere.
The issue here is the very people who praise the environmental protections in place, are trying to evade the same laws to pre-empt the Pebble project from even applying for a permit for their mine. It would be another example of circumventing existing laws for political reasons; and could be a far-reaching precedent for the entire country, not just for mining but any project that requires earth-moving (such as a highway).
You really need to read the entire piece to understand the issue.