Hilltop mine, Slim Buttes, Harding Co., South Dakota, USASouthern part of butte. Lignite.
6 entries listed. 4 valid minerals.
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Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp419-430
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