The Environmental Protection Agency on Monday moved to ensure it has a role negotiating the terms of any permit for the massive Pebble Mine planned near Alaska’s Bristol Bay, a move that may bolster the permit’s chances of approval. The EPA’s action comes as the US Army Corps of Engineers evaluates how the proposed gold, copper and molybdenum mine would affect the region’s water, land and thriving salmon fishery. In comments filed with the Army Corps, the EPA invoked a provision in a federal clean-water law that would allow top officials from both agencies to work out disagreements over a potential mine permit.