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by swamp40 799 days ago
Neither X-ray nor x-ray fluorescence (XRF) is going to be able to scan large objects properly for gold from a distance. XRF machines only show the surface or slightly below the surface. If you put gold inside a lead pipe - no chance.

If there was ever a method to reliably detect gold from a distance without costing millions of dollars, it would start a new gold rush.

So, this was either discovered by a very careful inspection or more likely a tip-off.