25
Apr
13:21
North Dakota discovers critical minerals zone with lignite coal
The North Dakota Department of Mineral Resources and state geologist Ed Murphy say they have discovered a 30-foot-thick interval of rocks containing elevated levels of untapped rare earths, Kallanish reports.
The brightly coloured rock unit is called the Bear Den Member of the Golden Valley Formation, which is found in upland areas covering 340 square miles across west-central North Dakota and includes lignite coals and organic-rich mudstones enriched in critical …
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