A former EPA official tied to a controversy over allegations of federal overreach at an Alaska mine project has mysteriously gone off the grid, sources tell FoxNews.com, complicating lawmakers' efforts to question him. Emails from Phillip North, a now-retired Environmental Protection Agency employee, recently surfaced that seem to show the Alaska-based biologist tried to get the Pebble Mine project killed as far back as 2008. Those emails -- and memos indicating government officials worked early on with tribal leaders and environmental groups to oppose the venture -- raised questions about the agency's claims that when it ultimately vetoed the gold-and-copper...