Photos from: Earth MRI scan for US critical minerals



A boom with orange ball-shaped instrument on the front of a helicopter.Geologist uses hammer to break a critical minerals sample off a rock in Alaska.University of Maine geologists hike through the forest at Pennington Mountain.Bright red radiometric hot spot that led to rare earths discovery in Maine.

U.S. Geological Survey

A closeup of the geophysical anomaly that led to the rare earths-niobium-zirconium discovery at Pennington Mountain. Click on image for a view of the entire 2021 Earth MRI radiometric survey carried out by USGS in northern Maine.



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