Lisbon Valley
Uranium was discovered in sandstone of the Chinle Formation in Lisbon Valley, San Juan County in 1913, and some carnotite was mined on a small scale for vanadium in 1917, 1940, and 1941. In the uranium mining boom of 1948, mining began in sandstone of the Permian Cutler Formation. Then in 1952, Charles Steen drilled into a rich 70-foot-thick (21 m) uraninite orebody in the Triassic Chinle Formation; that type of deposit became the largest producer in the district. Ore is distributed along 15 miles of outcrop on the southwest side of the Lisbon valley anticline. The district produced 49 million pounds of U3O8 (uranium oxide) through 1965.
Read more about this topic: Uranium Mining In Utah
Famous quotes containing the word valley:
“To be seventy years old is like climbing the Alps. You reach a snow-crowned summit, and see behind you the deep valley stretching miles and miles away, and before you other summits higher and whiter, which you may have strength to climb, or may not. Then you sit down and meditate and wonder which it will be.”
—Henry Wadsworth Longfellow (1807–1882)