Christensen still places a tenuous trust in the system that promises to keep his water safe and leave his ranch clean. He relies on the royalty income and believes the national pursuit of energy is important enough to warrant a few compromises.
Yet if he had it to do over again, he's not sure he would lease out the rights to put a uranium mine on Christensen Ranch.
"It's probably worthwhile for this generation," he said. "You just don't know about future generations."
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John Christensen's grandfather, Fred, first allowed uranium exploration on the family's ranch in the 1950s.
Fred Christensen had come to Wyoming from Michigan as a homesteader in 1906, finding work as a ranch hand and settling on a small tract at the base of the northernmost Pumpkin Butte. The Christensens farmed sheep, selling their meat and their wool, and used the proceeds to buy up more land. Through marriage and business, the family amassed some 70,000 acres, coming to rank among the largest private landowners in the United States.
Yet droughts plagued the region, making agriculture difficult. Tapping into Wyoming's resource wealth, the Christensens staked claims on the property, selling mining and drilling rights to companies that helped transform the Powder River Basin into the energy basket of America.
Uranium was discovered underneath Christensen Ranch in 1973. In 1978, after the property had been divided between cousins, Westinghouse Electric launched the first large-scale uranium mine on John Christensen's portion.
Modern mining for the radioactive ore inevitably pollutes water.
To avoid digging big holes in the ground, operators inject a mixture of sodium bicarbonate, hydrogen peroxide and oxygen into the rock to separate out the minerals and bond to the uranium. Then, they vacuum out the uranium-laden fluids to make a fine powder called yellowcake. The process leaves a toxic mix of heavy metals and radioactive ions floating in the groundwater and generates millions of gallons of waste that need to be dumped deeper underground.