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Originally Posted by J_Player
MMI Technology, who measures ions in the parts per billion and sub-parts per billion range in surface soil.
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My point was that any gold ions that
may be present in the soil would be in miniscule quantities . This is confirmed by your quote. I would bet that even MMI Technology are not detecting these ions outside the lab.
The sort of gold ions you are describing are most likely the soluble form of gold encountered in mining, whereas the Mineoro videos specifically show instances where single coins are being recovered. So how many gold ions do you think exist in the soil above a single coin? Since the coin is not made from soluble gold, I would expect the answer to be a very round number.
Whether gold ions are lurking under the soil in a few parts per billion or not, does not prove that LRLs are a viable method for gold detection.