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South Dakota and the northwestern part of Wyoming. Several of the peaks reach an altitude of from 2.000 to 3,000 feet above the surrounding plain, and the highest summit of all is Mount Harney, which is 7,400 feet. In 1875 the Dakota Indians ceded the region to the United States, and immediately a valuable mining industry sprang up. In 1875-91 the district yielded gold to the value of $45,000.000, and silver to the value of more than $2,000.000. Valuable deposits of tin have also been found on Mount Harney. For later productions in this region see gold; South Dakota.
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