A Grand Canyon rush for uranium

Overlooking the creek are 14 uranium claims, according to an analysis of Interior Department data by the Environmental Working Group. The claims are held by companies such as Energy Metals and Uranium One Ventures, and by an official with Quaterra Resources Inc., which boasts to investors that it is "one of the largest claim holders in the Arizona Strip District."

On a hazy morning, the canyon is still visible downstream. And Martin, charged with its protection, is apprehensive. His experience with uranium mines is confined to one that actually operated right at the canyon's edge, grandfathered in because it opened before Congress created the national park in 1919. The U.S. bought the site in 1962, and mining stopped in 1969.

Now the remains of the aerial tram that carried the ore can be seen at the South Rim. Special strips have been placed atop the structure to keep California condors from resting there, to protect them from lightning strikes. And a chain-link fence keeps hikers away from mine wastes.

Elevated radiation has been detected in Horn Creek below, and signs have been posted warning visitors not to drink the water. A National Park Service sign explains to the public that uranium deposits also lie just outside the park.

"What does the future hold?" the note asks, and concludes: "Mines and other industry near parks often bring unforeseen impacts on park resources."

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judy.pasternak@latimes.com