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why does DEEP iron show up as coins on the ace250?

G

Goes4ever

New member
the last two houses I was at had lots of deep iron, large washers, big iron rings etc.....all very deep, I had my sensitivity at 5 bars. First pass over the target would get me a bouncing signal from iron to quarter, nothing repeatable, said it was 6" deep. So I bumped sensitivity to 6 bars and passed over it again, this time it locked on to quarter and said it was now 8+ inches deep, well I dug several of these because in the last couple weeks bouncing signals have been paying off good for me. Well these items turned out to be all iron junk. How does iron show up as a coin?? If I have it in coin mode shouldn't it be getting rejected?

What am I doing wrong? If I want more depth on older home sites, don't I need to up the sensitivity?
 
You are not doing anything wrong. Rusty Iron oxidizes and fools most detectors into recognizing it as a coin. The same reason that tab tops give the same reading as gold rings. Garrett makes a more expensive unit that shows relative size of the target, which reduces the number of larger rusty iron objects that you have to dig. Ultimately, it is one of those things we have to live with until the technology gets better at distinguishing the junk from good coins and rings. You will never want to pass up a good coin, just because you didn't dig it because it might be trash. It just comes with the territory.
 
i have the 1500 and sometimes it does the same thing.the whites xlt i had before would also get fooled sometimes.now if i get in an area with a lot of iron,i will go to zero discrimination and listen for the high tones amongst the iron.also you might try turning the sensitivity down a little bit and see if that helps.i missed a nice silver dollar one time because i took the dollar signal to be iron,which is often the case.
 
Deep rusty iron can fool most detectors. Especially round rusty iron. Sometimes you will get an "edge beep" on larger iron. This means that your detector won't beep when your coil is centered over the target. But it will beep right on the edge of the target. So here's something to try. Pinpoint your target exactly. Then resweep your coil directly over that spot in very short and quick sweeps. If you get a beep then dig. If there is no beep then your detector is rejecting the target. Then move your coil off of the center of your pinpoint spot. If you get a beep away from the center of your pinpointed target then it's most likely an "edge beep" I would just move along then.
Also your larger iron will have a larger pinpoint foot print. ie- not coin size.
You can get an "end beep" on a piece of pipe too. But when you pinpoint you will see a larger than coin foot print.
 
Because the oxides + base metal + halo + mineralization = the same conductivity as coins. To get a good accurate 2nd opinion, do this:

"Stamp your foot HARD on the ground above the target and rescan. A lot of times the halo will be broken and the machine will give you a different reading"
This really works well with old rusted metal bottle caps..
 
pin point as you go from center of target to the edge. If there is a slight dip in the strength of your signal you may have two targets. The larger iron may be masking the good target. Wiggling the coil will help you pp the coin signal, but it may be the iron edge. At times I have to start my pp on the suspected good target and work my way toward the iron or the iron target will dominate the signal.
I had a lot of problems with rusty iron roofing nails yesterday. When they are 6" deep I can be fooled in believing they are a deep coin. That is where I find most of my wheat's. If it is 2"to 4" it is rusty iron. I may only get a beep every third swing. pp is sometimes vague. If I am not around iron I find a lot of wheat's starting at 6" and deeper. In the deep black soil of older homes the coins sink deep. When they start demo-ing these houses and grade the ground again, I will start finding a lot older coins, IH, v-nickels, mercs, etc.
 
[quote John-Edmonton]Because the oxides + base metal + halo + mineralization = the same conductivity as coins. To get a good accurate 2nd opinion, do this:

"Stamp your foot HARD on the ground above the target and rescan. A lot of times the halo will be broken and the machine will give you a different reading"
This really works well with old rusted metal bottle caps..[/quote]

Or a big brute like you just drove the target so deep it can't be detected any more.:rofl:
 
I dig the deep iron when using the ACE. I can tell if it is a smaller object (such as square nails) or a larger object (such as an axe head) by the size while pinpointing. I can then make my decision.
 
Rust. Your not doing anything wrong. Just a target that has varying conductivities.
The non rusted iron will beep low as it's pretty low conductivity. But surface rust is
highly conductive, and that is what is causing most of the upper scale beeps.
Also, a large iron item can ring higher if it is really large. Much like a can, etc..
The bouncing non steady ID will usually be either rusty iron, or other trash.
Coins don't vary ID all that much, except that they might read hotter than
normal if you have leaching. But they won't usually be bouncing down low.
If it bounces around low to high, you can almost bet it's some kind of trash,
rusty iron, etc.
 
n/t
 
AS I've said a thousand times sensitivity does not equal depth nor does it mean depth. Higher sensitivity doesn't make the signal go deeper into the ground it just makes the coil more sensitive to everyting in the ground including the junk you are finding and any mineralization that may be present.

Try "twitching" on these signals. Your detector is a "motion detector" and the faster you whip the coil over a target the better it discriminates and the deeper it goes. Run your sensitivity at four bars and twitch often and see what you come up with.

Bill
 
[quote Uncle Willy]Yeah high sensitivity can cost one a lot of good targets.

Bill[/quote]what do you mean by this? please explain
 
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