Economic and Environmental Geology

Fig. 8.

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Fig. 8. US coal basins and their coal ranks. Sites marked with stars are coal basins with high REE concentrations (>300 ppm). Currently known coal basins are Central Appalachian coal province (Kentucky-West Virginia-Pennsylvania) and Powder River basin (Wyoming). Image from US DOE infographic.
Econ. Environ. Geol. 2022;55:241-59 https://doi.org/10.9719/EEG.2022.55.3.241
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