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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U.S. access to critical mineral resources, but the airborne magnetic survey maps that support this effort are sadly out of date.

Over a dark blue-green square appear the words Special Report: The State of the Science 1 Year On.

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