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According to the masters, in the experience in the field when detecting, the depth of the target in certain mineral soils can be further than the air test. An example of a ring relic that has been buried in the ground for years is detected at a distance of 35cm, but after being tested the distance in the air is only 25cm, is that possible?, please explain and why, thank you
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It's possible with iron targets because they can leach out iron oxide into the ground and create a larger effective target area. Some people have theorized that non-ferrous targets can also do this but I don't think so. Ferrous target responses are generally magnetic in nature and leaching can increase this response. Non-ferrous target reponses are eddy in nature and leaching probably won't increase the eddy field.
Separately, there have been reports of PI detectors getting better depth on non-ferrous targets in wet salt sand. If it's true, I don't know why. -
Carl is absolutely right,
The masters and the authors should realize that there is no effect of “Halo” . The halo does not exist at all.
HamidComment
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I have experienced what appears to happen also with a PI on in-situ Gold Nuggets response within mineralised ground compared to the response once the Nugget had been dug up and then placed back in its open hole.Originally posted by Carl-NC View Post
I therefore assume the mineralised ground is somehow enhancing the Nugget's response as there is no Halo involved from Gold Nuggets.Comment
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Hello Carl and garyq.
I fully agree with what you say, I have noticed this in the field too, and I think Mr B candy said so in a magazine way back. Halo's from nuggets are very unlikely, and if they were there a PI is not going to respond to it. Ask Eric F.
Cheers ozgoldComment
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some metals such as copper coins are surrounded by a semiconductor layer due to copper oxide. The eddy currents formed in it do not flow to the ground immediately and are protected. This causes a strong response. The depth of search increases. However, this is not the case for gold coins.Comment
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extraordinary!! thank you mr.carl the explanation is easy to understand, because according to senior hunters in our area detection in the ground can be further,, therefore I asked geotech to find the answerOriginally posted by Carl-NC View PostComment
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In our country Indonesia, most hunters (metal detecting) are hunter relics from the past kingdom era, old graves that have lost their bones, what are left are traditional weapons (gaman), and if you are lucky around the Gaman there must be gold, the size of the gold depends caste and wealth of the corpse during his life, therefore detectors that can detect iron with a depth of 1-1.5 meters for iron targets here are of great interest, if gamma has been detected, just look for gold, experience has been able to get 70cm of gamma, after being detected in the air how come it's only 50cm, that's why I'm confusedComment
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I dont believe in the halo effect except with iron. With a VLF which has a threshold you can hear a change even after rusty iron has been removed
This doesn't happen with other metals
I have found maybe twice in 10 years a target beyond the depth of the detector
one was a UK copper penny that had been domed by being shot
the other was a lead token both at over 20" and still detected if put back in the bottom of the hole.
no idea why must have been something else nearby ? effecting the response.Comment
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