Northern Black Hills
Uranium was discovered in 1952 in Cretaceous sandstones of the Inyan Kara Group near its outcrop in Crook County, Wyoming, near the northeast edge of the Black Hills. Production began in 1953. Ore minerals are uraninite and coffinite in unoxidized sandstone, and carnotite and tyuyamunite in oxidized sandstone. Gangue minerals in unoxidized deposits are pyrite, marcasite, and calcite; in oxidized deposits calcite and iron oxide.
No mining has taken place in the Northern Black Hills district in recent years, but recent high uranium prices have brought new exploration drilling to the area.
Read more about this topic: Uranium Mining In Wyoming
Famous quotes containing the words northern, black and/or hills:
“You’ll wait a long, long time for anything much
To happen in heaven beyond the floats of cloud
And the Northern Lights that run like tingling nerves.”
—Robert Frost (1874–1963)
“In the black of desire
we rock and grunt, grunt and
shine”
—Denise Levertov (b. 1923)
“Fretted shadow on stumps
A vanishing husk
Of light . . . grey lumps
Of stone verge the hills with fears.
It is quickly dusk.”
—Allen Tate (1899–1979)