Developers’ efforts to overturn the cancellation of a vast gold and copper mine planned for southwest Alaska are getting a boost from national mining and pro-business groups, including the U.S. Chamber of Commerce.

On Nov. 24 and Nov. 25, the Chamber and the National Mining Association filed separate friend-of-the-court briefs in the lawsuit brought by the developers of the proposed Pebble Mine against the Environmental Protection Agency, which vetoed the mine.

Neither group has intervened in the case against the EPA, but the briefs represent the groups’ support for the proposed mine and offer legal arguments that Judge Sharon Gleason could consider as she debates whether to move the project forward.

In 2023, the EPA invoked a rarely used “veto” clause of the Clean Water Act to say that

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