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JOSHUA ARMSTRONG/ Cronkite News Service
Mohave County Supervisor Buster Johnson, left, geologist Karen Wenrich and former congressional staffer Mark Trautwein wait to testify during a contentious House subcommittee hearing on a bill that would open 1 million acres near the Grand Canyon National Park to new uranium mines.

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Grand Canyon uranium mining battle heats up

House bill would block the Department of the Interior from imposing a 20-year ban on new mines.