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:
“The Roman world is in collapse but we do not bend our neck.”
—Jerome (c. 340–420)
“Because the Muses never knew their pains.
They boast their peasants’ pipes, but peasants now
Resign their pipes and plod behind the plough;”
—George Crabbe (1754–1832)