Report of Investigation 133

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Grassy hills with bright white and orange colors of the exposed geological formation.

Critical minerals are typically enriched in the lower part of the bright bed and the underlying coals of the Bear Den Member of the Golden Valley Fm, western ND.

Publication Cover Photo - Coals in the lower half of the bright beds at the base of this butte in Dunn County are enriched in critical minerals.

Geological Survey geologists collecting coal samples for the critical minerals study in Slope Co., ND in 2018.

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A stratigraphic profile of rare earth element concentrations for the 122 rock samples for the NDGS critical mineral study. The rock colors are reflected in the profile.

Map of the Golden Valley Formation and sampling sites.