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Offline markgTopic starter
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« on: July 28, 2010, 12:28:39 pm »
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Knowing how iron effects the detection depth of a metal detector and in some cases iron masking can completely hide buried metal targets from detection I have a question about cache hunting. Now a little more information is in order.
Earlier this year I was removing old fence post and decided to bury a small cache of zinc pennies that I had found over the past years that were damaged to much for the bank to take. I used a plastic container that measured 4" in diameter by 6" long. I filled the container with pennies and buried it at a measured depth of 22". I took my detector, setup up as usual and began to sweep across the hole where I had buried the container of pennies. Nothing but a very low iron grunt sound and a VDI of iron came from my machine. Not being pleased with the results I dug up the pennies carefully checking the dirt for any iron and found one old rusted nail "4" long" about 15" deep right on top of the pennies. Okay bear with me here. I buried the pennies again while rechecking the dirt again for any iron. After finishing, I checked the hole with my machine and again only a low iron grunt. Well I dug the pennies up again, checking each handful of dirt again, nothing. This time I buried the container at exactly 12" from the top of the ground.  I turned on my machine and still only a low iron grunt.
Now all that said, if a person was hunting for a buried cache of old coins what would be the best approach?
Turning the sensitivity up did not help.
Reducing the discrimination to zero did not help.
Running in all metal did not help.
What strategy would a person use in this situation?


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Offline Bugar
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« Reply #1 on: July 28, 2010, 02:20:23 pm »
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If it's an old cache of coins, wouldn't be in plastic, and I think your'e coins, being freshly buried and all together,in a plastic container, not all nasty , like coins would be in the soil, are not giving the Halo type effect that your'e detector can hit upon, I believe your'e getting a signal kinda like a chain would put out, similar to one link at a time , but all confusing to the electronics, I may be all wrong, but that is my thinking today Detecting

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« Reply #2 on: March 23, 2011, 07:05:11 pm »
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Mark what size coil was u using?  If u were using say a 24in or an 18 in it might have made a difference do u think? I have a quart jar full of zinc pennies like you burried at 15in from the top and cant find many detectors that will find it only my whites 808 at the moment.My pennies are in a glass quart jar with a metal lid.I don't have a large head.

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Offline GoldDigger1950
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« Reply #3 on: March 27, 2011, 09:01:51 am »
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I'd suggest that you have a problem with the lid of the jar masking the larger mass of the pennies. In a real world situation, this would also be the case which is why most of us search in the all metal mode using zero discrimination.

To test my suggestion for the reason, turn the jar upside down making the lid at the bottom of the metal mass. See what happens then.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #4 on: March 27, 2011, 03:09:19 pm »
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In all metal it shouldnt make any difference whether lid was on top or bottom should it?Huh??

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Offline GoldDigger1950
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« Reply #5 on: March 31, 2011, 09:24:58 pm »
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It surely would have an effect since the size and shape is maybe 3 or 4 inches in diameter while a coin is so much smaller. Each coin, unless they are fused into one mass, will react both individually and together with adjacent coins. There's no real predicting the actual reaction until you try it.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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Offline shortribs
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« Reply #6 on: April 15, 2011, 05:58:21 pm »
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I've got 900 pennies in the jar and they are packed in it. guess that won't make a difference beings they aren't fused together Huh??

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Offline Wanna B. Miner
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« Reply #7 on: April 23, 2011, 07:26:56 am »
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does this mean that going back to the ground where grand pa burried the gallon jar of silver dollars is for not?


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Offline shortribs
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« Reply #8 on: April 25, 2011, 12:39:39 pm »
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I'd say if it was silver dollars and in a gallon container it would go deeper than My 900 pennies in a quart jar @ 15+ in down.

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