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Kelsey Lake Diamond Mine is a defunct diamond mine in the U.S. state of Colorado. It is located in the State Line Kimberlite District, near the Wyoming border, and consists of nine kimberlite volcanic pipes, of which two were open-pit mined. At the time it was operating, it was the United States' on
ly modern diamond mine, and only the second commercial diamond mining operation in North America, the first being in the Crater of Diamonds State Park, Arkansas which was mined in the early 1900s.
Listen to the audio guide for Kelsey Lake Diamond Mine Free on WIP — starts by itself when you arrive, even with the screen off