Monument Valley
A Navajo discovered uranium in 1942 in Monument Valley on the Navajo Indian Reservation in northeast Arizona. The first mine in the district opened in 1948. Uranium and uranium-vanadium minerals occur in fluvial channels of the Shinarump Sandstone member of the Triassic Chinle Formation. Ore deposits are associated with carbonized wood in the sandstone. Mining stopped in the Monument Valley district in 1969, after producing 8.7 million pounds (3900 metric tons) of uranium oxide, more than has been produced from any other uranium mining district in Arizona. In 2005 the Navajo Nation declared a moratorium on uranium mining on the reservation, for environmental and health reasons.
Read more about this topic: Uranium Mining In Arizona
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“I see his monument is still there.”
—Calvin Coolidge (1872–1933)
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—Sean O’Casey (1884–1964)