Post By SusanMN
Jun 08, 2013, 05:54 PM
Big clumps that read silver 91
I am finding quite a few clumps of things that register as silver on my AT-Pro. They show up as #91. I have both clumps that look melted and bars with bolts in them. Do heavy clumps or chunks of aluminum show as silver? Or is there some other metal that does this? None of it is corroded. I am finding it all on the shoreline of my property. Thanks for any help!
Jun 08, 2013, 09:06 PM
They do on every machine I have owned. Deep rusty iron also rings up as silver.
The harder you work, the luckier you get.
Jun 08, 2013, 09:28 PM
Metal detectors do NOT make metallic analysis of items. They don't know iron, from gold, from titanium, or anything else. They put an electric field into the ground and look for something to send back part of the field. Based on the signal return, it gives you an estimate of target and depth. Large, tiny, or corroded items give different signals returns than round, "coin sized" objects.
Last edited by Jason in Enid; Jun 08, 2013 at 09:31 PM.
Jun 08, 2013, 09:46 PM
Jason, I know that. I was just wondering what other non-corroding metals show as silver. Obviously this is al as I figured.
Jun 09, 2013, 12:25 AM
Lead is a tricky one too. I have dug a few large fishing weights that sounded sweet with my AT Pro.
Jun 09, 2013, 01:20 AM
bbells, well if you "know that" (what jason is telling you), then why do you repeat the misconception of "... metals [that] show as silver"?
Originally Posted by bbells
As jason was telling you, detectors don't tell one metal apart from another. (despite what the TID printed categories and graphs may say as "silver", "gold", etc...) Instead, all the TID is telling you, is conductivity, NOT "composition". And size plays into that. Thus yes: An entire aluminum can (for example) might read as "quarter". But a small snippet of that SAME can might read as "nickel" or "tab", etc... But as you see, in each case, the "composition" remained the same ALUMINUM. Doh
So what you have reading "91" can just be big cr*p (a big wad of molten aluminum or brass or something). The TID scale is based on relative size. So a "dime" reading, assumes a "dime-sized-target", and so forth.
Metal detecting is my one worldy vice!
Jun 09, 2013, 02:44 PM
Originally Posted by Tom_in_CA
Strikes me as a rude response to a simple question. Information is good, correcting someone who is trying to ask a question isn't.
The harder you work, the luckier you get.
Jun 09, 2013, 03:36 PM
Danged if I can think of one
Yep, that is true with my machine too.
Originally Posted by SusanMN
Jun 09, 2013, 05:50 PM
I have an ace 350 and I notice that any jewelry will make my machine ring every sound super fast and is 2" to 4" that's how I know it's gold or silver shallow responses on high rings are either bottle caps or pull tabs or coins but if its high tone reading 6" or deeper its crap mostly nails or can food haha pure crap but I've only had my detector for less than a month before this one I had a fortune hunter by bounty hunter so kind got a bit of a grip anyways happy hunting
Jun 11, 2013, 06:58 AM
If it's a big wad you can generally tell if its aluminum or a precious metal. If you can't easily tell, pile pennies till its a pile about the volume of the wad, and see which is heavier. The pennies will be a LOT heavier if it's aluminum.
You mostly end up with aluminum wads from bonfires and such, you find a lot near where teenagers or others partied at some point in the last 60-70 years or so. It gives you a good point to set a circle around though, as you know people gathered there.
Also you need a really hot fire, and some extenuating circumstances to get silver or gold wads. If there was a house fire there that burned all night for example, you could find gold or silver wads.
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