Originally posted by SimonS
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Direct answer to your question is: NO!
But story is much more complex than it seems to be.
Magnetometers CAN "detect" and measure each earth magnetic field anomaly.
So if non-ferromagnetic object (the same one from your question) indirectly somehow do affect earth magnetic field and it's presence is
causing any eventual anomaly: than, obviously, it can be detected by magnetometer.
Same story for locating caves and any other soil cavities.
Plain non-ferromagnetic can't affect earth magnetic field to a greater extent, so just that little anomaly to be detectable, empty cavity too.
But! There is always some "but"!
In archaeological surveys experts do search for archaeological remains which are composed of a high percentage of silica and ferric oxide.
Clay heated to "Curie point" in process of clay "baking" lines up to present magnetic field and when cooled it remains "directionally magnetized" for good.
Later when moved to another position or broken and spread around in soil ; it presents significant "anomaly" in relation with "normal" (referent) earth magnetic field and therefore it is easy to be spotted by magnetometer.
Artificial structures in soil also are made from artificial materials, mostly baked clay, and presents indeed significant "anomaly", easy to detect.
So, assuming that 100kg's of some treasure is placed in some room or space inside such underground artificial structure; it will be very easy (indirectly) located by magnetometer.
Because magnetometer will easy detect structure itself.
Apart from that, apart from artificial man made structures and materials; there is also (pretty tiny) chance for plain non-ferromagnetic material to be detected too, ONLY
in cases where those are either mixed, either are in pretty close vicinity with some detectable ferromagnetic material.
So... as you can see story is pretty complex and desired "detection" is pretty much conditioned with various factors.
So, most true answer to your question would be "NO" ... but also there are strictly conditioned cases where answer could be "YES" too.
Everything else you can see, read and find on the internet is pretty much related to charlatanism.
Cheers!
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