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V. J. S. Grauch

High-resolution map of magnetic field variations in Minnesota showing details of the geology underlying glacial deposits.
Posted inScience Updates

Finding the Gaps in America’s Magnetic Maps

by B. J. Drenth and V. J. S. Grauch 16 April 201930 September 2025

A 2017 executive order mandated a plan to evaluate U.S. access to critical mineral resources, but the airborne magnetic survey maps that support this effort are sadly out of date.

A view of a bridge, with the New Orleans skyline visible in the distance between the bridge and the water. A purple tint, a teal curved line representing a river, and the text “#AGU25 coverage from Eos” overlie the photo.

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