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australian electronic gold prospecting forum.com  |  Detecting for coins and relics  |  Detecting for coins and relics  |  Topic: The buried hoard test 0 Members and 1 Guest are viewing this topic. « previous next »
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Doug
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« on: September 17, 2010, 11:10:08 AM »
The buried hoard test
busting myths!
http://www.garysdetecting.co.uk/hoard_test.htm
doug happy face
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Aziz
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« Reply #1 on: September 17, 2010, 06:33:34 PM »
Hi Doug,

thanks, it's interesting reading. Thanks for Gary's work too.

in "The Test"-section:
"Our earlier tests had proved that the Halo effect of buried coins etc played no real part in detection depth in fact the halo effect only applies to Iron. To prove this fact next time you dig an ancient coin try to detect the soil in which it came out, if the halo effect was true the soil would give off a signal to."

I think, the whole halo effect does not really exist. It's completely a myth.
Moreover, it's the sum of two effects:
- skin effect (corrosion of the targets surface)
- reactive vs. resistive signal response change due to corrosion

Well, gold does not corrode. So it applies only to iron targets (ferro magnetic correded metals).

Aziz
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peterlinktech
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« Reply #2 on: September 17, 2010, 07:31:54 PM »
I  shake my head when i hear the halo effect, talk about an old wives tale! Disseminated ions, oxides, sulfides or any metallic particles that have dissolved into the surrounding soil or ground matrix will have zero influence on detection depth.
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Aziz
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« Reply #3 on: September 17, 2010, 07:36:15 PM »
Quote from: peterlinktech on September 17, 2010, 07:31:54 PM
I  shake my head when i hear the halo effect, talk about an old wives tale! Disseminated ions, oxides, sulfides or any metallic particles that have dissolved into the surrounding soil or ground matrix will have zero influence on detection depth.

Hi Woody,

interestingly, but ML does mention it in their instruction manual.
Even in the newest version: page 42 & 46
 rolleye 1

Aziz
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Tinkerer
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« Reply #4 on: September 17, 2010, 07:58:08 PM »
Quote from: peterlinktech on September 17, 2010, 07:31:54 PM
I  shake my head when i hear the halo effect, talk about an old wives tale! Disseminated ions, oxides, sulfides or any metallic particles that have dissolved into the surrounding soil or ground matrix will have zero influence on detection depth.

The mis conception lies in the following facts:

Ions, oxides, sulfides etc. by themselves can not be detected with a metal detector.
However, these particles are the result of electrical currents, ion migration.

As we all know, electrical currents generate a magnetic field. this magnetic field in turn is surrounded by the Earth's magnetic field and therefore generates a disturbance or anomaly.

Metal detectors and magnetometers are designed to detect magnetic field changes. This is how a Halo can be detected.

Charcoal can produce a Halo as explained in an other post.

There are totally organic chemical processes that happen in nature, that can produce these magnetic fields. Such occurrences are helping to detect Oil fields,  which, I think we all agree are not metallic.

(I used to work in the oil patch)

Tinkerer
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peterlinktech
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« Reply #5 on: September 17, 2010, 10:37:08 PM »
Charcoal is a strange one as it sounds like a target but in 28 years of metal detecting I have never found an enhancement due to any halo effect. I have purposely reburied rusted iron object after breaking up the rust in the soil and replaced the target and the response is the same, i think it has more to do with orientation than anything else. Another fallacy is that wet ground is quieter than dry, this was being bandied around for years and is not true.

Charcoal effect is more to do with conductive salts.   (ihmo)
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