Originally posted by Pompey
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Besides: if metal-ions of long time ago buried corroded coins penetrate the surrounding soil this also improves the overall field effect.
Of course freshly buried old coins with bad surface contacts to each others are not as good detectable as new ones.
What really counts is the surface. A small thin layer of alu-foil 10x10cm is almost the same good detectable as a 10x10x10cm iron cube!
No matter if the alu-foil is cutted to tiny bits with no connection inbetween. You won't find a single coin-stack of 1kg where the top of this stack is at the 2ft mark, but if the 1 or 2 pound coin cache has at least 15cm diameter.
btw. a principal information:
Metal detectors have their electro-physical limits concerning signal noise ratio in combination with radiation / penetration power, coils size, ground conditions plus human detection skills!
Those are the multiplicators that counts, each single one of them!
The biggest problem with depths is the "blind field test" versus "already known buried target directly under the coils center" !!!!
Under real conditions depending on sweep speed and moving forward distance between those the real hidden target only is for about ca. 35% of the time at this "best position". And often the coil has more distance to the ground than at testfields with known buried targets. And with iron disc the total sensitivity is reduced, too.
The big advance to the Blisstool is its analog extreme critical threshold tuning thats why persons with experience and skill are able to distinct between static noise and very weak detection signals but not everyone is capable or trained for this. Because it takes alot of extra energy to listen very carefully to the "wood of signals".
However, if you consider the above mentioned arguments concerning "real search conditions with unknown targets" even the Blisstool won't find a 1'' coin at over 1 ft because there are simply too many disruptive factors.
Anyway, read all the test results here:
and you have at least a very good "test situation" orientation.
Oh and before I forget:
I have bought now another ultra sensitive MD from Eastern-Europe that detects a 7cm diameter can at 1m but because of some extremly unfair and ignorant persons in this forum I will have to think twice if I even will give the slightest clue what kind of detector this is!

Just wanted to make some of these crazy guys a bit curious...

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