History of Uranium, Utah
Taken from the Utah History Encyclopedia (Links Added)

With the end of World War II, the Atomic Energy Commission replaced the Manhattan Project and launched the first federally-sponsored mineral rush in history. The AEC constructed roads into the back country, promised $10,000 bonuses for new lodes of high-grade ore, guaranteed minimum prices and paid up to $50 per ton on 0.3 percent ore, constructed mills, helped with haulage expenses and posted geologic data on promising areas tracked by federal geologists using airborne scinillometers and other sophisticated radiation detection instruments.

The Four Corners area, where Utah, Colorado, Arizona and New Mexico meet, suddenly teemed with prospectors in the greatest ore search since the gold fever days of the previous century. Amateurs and experts, alike, followed AEC guidelines and used radiation detectors called Geiger counters to test promising sandstone formations for uranium deposits. Concentrating on exposed outcroppings along canyon rims, they searched primarily for the grayish Salt Wash member of the Morrison formation. When a likely claim was located, they used diamond drills to core test holes to determine if mineable ore was present.

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