In article ,
Spehro Pefhany wrote:

There are a variety of such techniques- and I'm involved in some
ground breaking (haha) development on a method that works from fixed
wing aircraft. To say there is a market is an IMMENSE understatement.
Resources are white hot, and anything that helps find them is valuable
almost beyond imagination.

An old fixed wing technique is to fly a veeeeery sensitive magentometer
around and look for anomalies.

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