Hi, Ken,
Here's a couple of oddball cases for your aeromag discoveries list, not so
much economic powerhouses as clean, pure aeromag discoveries. One is the Butte
Valley deposit in White Pine Co., Nevada, identified on the Gulf surveys of the
early- to mid-fifties and messed around with by Gulf, Cyprus, Kennecott,
Exxon... It's a deep skarn concealed by a slide block and alluvium, so no
recognizable evidence at surface (well, there are a few bits of oxide copper in
the nearby range, but they're definitely after the fact in importance).
Shallowest mineralization at 1800 feet, best stuff at 3,000 or so.
Second, the iron ores of southwestern Utah were pretty much worked out during
the mid-fifties using aeromag. I don't know the particulars, but Geneva Steel
ran for years on the basis of that work. The chief geophysicist / exploration
manager was.... Dr. ... Lee (?).
--Will Frangos
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