Collapse Breccia Pipes
Uranium was discovered in the Orphan copper mine near the south rim of the Grand Canyon in 1950. The mine has been private property since 1906, and is today completely surrounded by Grand Canyon National Park. The discovery led to the finding of uranium in other collapse breccia pipes in northern Arizona. The breccia pipes were formed when overlying rocks collapsed into caverns formed in the Mississippian Redwall Limestone. The pipes are typically 300 feet (91 m) in diameter, and may extend up to 3,000 feet (910 m) vertically.
Read more about this topic: Uranium Mining In Arizona
Famous quotes containing the words collapse and/or pipes:
“At the crash of economic collapse of which the rumblings can already be heard, the sleeping soldiers of the proletariat will awake as at the fanfare of the Last Judgment and the corpses of the victims of the struggle will arise and demand an accounting from those who are loaded down with curses.”
—Karl Liebknecht (1871–1919)
“What does headquarters think these guys came over here for, a sewing circle? They go up playing for keeps. Cops and robbers with rocks in the snowballs. Brass knuckles and lead pipes and a roughneck conviction they can lick any man in the world.”
—Dalton Trumbo (1905–1976)