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GILLETTE, Wyo. – On a lonely stretch at the edge of the Great Plains, rolling grassland presses up against a crowning escarpment called the Pumpkin Buttes. The land appears bountiful, but it is stingy, straining to produce enough sustenance for the herds of cattle and sheep on its arid prairies.

“It’s a tough way to make a living,” said John Christensen, whose family has worked this private expanse, called Christensen Ranch, for more than a century.

Christensen has made ends meet by allowing prospectors to tap into minerals and oil and gas beneath his bucolic hills. But from the start, it has been a Faustian bargain.

As dry as this land may be, underground, vast reservoirs hold billions of gallons of water suitable for drinking, according to the U.S. Environmental Protection Agency. Yet every day injection wells pump more than 200,000 gallons of toxic and radioactive waste from uranium mining into Christensen’s aquifers.

What is happening in this remote corner of Wyoming affects few people other than Christensen – at least for now.

But a roiling conflict between state and federal regulators over whether to allow more mining at Christensen Ranch – and the damage that comes with it – has pitted the feverish drive for domestic energy against the need to protect water resources for the future. The outcome could have far-reaching implications, setting a precedent for similar battles sparked by the resurgence of uranium mining in Texas, South Dakota, New Mexico and elsewhere.