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TID numbers on gold coins

N

nickie

New member
Someone took me out to a place where supposedly there is a hoard of gold sovereigns stashed. I had to do a lot of negotiating to get in on this hunt. Who knows what will come of it, probably nothing, but it has happened before so I figured what the heck, might as well check it out.
Now I went to the faq page and checked some TID numbers for gold coins, and did some air tests on various large metal objects to see what kind of readings and depths I was getting,so I thought I would throw this question out there and hopefully gain some insight .

I have two questions for the experts.

1) If the hoard is in reach of the 705, and it is stashed in a wooden crate,would I be looking for a TID number the same as one gold coin ?
2) If the hoard is stashed in a metal container, would the 705 pick up the metal container or would it pick up what is inside the container, or would it give erratic readings picking up both container and hoard ?
Thanks in advance for your thoughts
 
Hi Nickie.
An Aussie gold sovereign will show up as 26. I have heard in the past, that large gold won't generally go past 32 on the VID. That could mean that a hoard of Sovereigns could read as high as 32. Can't tell you from personal experience though. I don't have a half sovereign, so I can't give you a number, but it will be lower than 26. The sovereign I have can give a solid lock with the standard coil, but I have noticed that with the HF DD coil (5x10) it can bounce around on the numbers a bit. Can't remember exactly which way, but still around 26.
Good luck with your hunt. It'd be awesome to find a bunch of them.
Mick Evans.
P.S. I imagine that the Aussie sovereign will be the same as the English one, as it was based on it.
 
Mick,I read your post on the TID numbers hoping I could match something up with the Brittish sovereign. We did a test on an Austrian one ounce Korona since that was all we had available and that read at 36 on the nose.
I turned the coin on its side,and same thing,36. I had a 17 gram gold chain register at 22.
The area is about 40m2 or 400m2 ft,and seems to have a bit of trash in it, so I am hoping to narrow it down as much as possible.I am wondering if faint sounds should be what I am looking for as it is probably a little deep,but because of the size,maybe it will be in reach of the 705.
If I get a faint sound,since I am looking for a box,I will then probably hammer an 8mm rod down and try and feel it out a little and see what I get before I do any digging.
But since there are some good signals there, it would be good to know what numbers I should be looking for.
This is a late WW2 hoard supposedly.
Hopefully someone else will jump in with a few pointers.
Thanks for your thoughts
 
I would think a hoard of coins in a can could be detected pretty deep. And yes if it were in a steel can that could effect numbers, but if your searching for a cache I'd dig anything that gives a repeatable signal. And remember the depth gauge is based on a single coin sized object, so if it were a whole can your depth meter might only say it was 6-8" deep when it might be more like 12-14" deep or more. I think the xterra could EASILY pick up a full can of coins 16-18" deep or more. I have dug awful deep before and found bigger iron pieces that did not register as iron.
 
Iron that does not register as iron is also a problem I have run across quite a bit and it is frustrating. That is why I would rather just take it slow. I think I will try to grid and mark the place somehow on a piece of paper ,so I can keep track of what I am getting for readings,do a little poking and see if I hit anything big underneath where I am getting the signals before I start digging 400sq ft of dirt .
I am wondering if someone can put all their gold loot in a bag and do a test and see what they get for a reading. But I dont know if it would be the same reading as a bunch of gold coins.
 
I have it at my dad's place for the freezing winter and I do not have my X-70 here to test what TID numbers gold gives. But as far as your Iron querry goes I can help a bit. Here is a thread I started yesterday on the Metal Detecting Forum---BEST DETECTORS IN IRON & TECHNIQUES http://www.findmall.com/read.php?18,1151847 with no responses yet.

Maybe you could use a FBS machine or BBS Minelab Sovereign GT with a 15" WOT coil or 18x15" SEF coil for finding your gold coin hoard. Of course if all you have is your 705 that will work fine too. The 3 kHz LF Concentric coil will handle Iron trash the best(listening for the tell tale harmonic audio tone of Iron, if I am not mistaken I think Digger-Randy calls it an Iron grunt with the LF coil) and will still pick up bigger gold pieces very well.

The big Pulse Induction machines like the Pulse Star II and Lorenz with a 40"x40"(1m.x1m.) coil will ignore small objects all together including small trash iron with no signal but will go very deep on bigger hoards about the size of a pop-soda can(about 3"x3") and bigger.
 
If the gold coins are buried in a non-metallic bag or box without nails or screws holding it together, the TID will be based on the coins themselves. If the box has screws or nails, you will likely get some effect from the lower conductive nails/screws. But not enough to discourage you. If they are buried in a metalic can, your TID will be the metallic composition of that can. If they are not affected by nails, screws or a metallic container, they will probably not read the same as an individual coin. I say probably not because without knowing how they are "stacked" in relation to each other, there is no way of knowing. A metal detector identifies the surface area of a target as the coil is passed over it. If the coins are stacked straight on top of each other, your reading will likely be very close to what the coin on top would read by itself. If they are stacked together and laying flat along the surface, you will get a long continuous reading, probably a bit higher in conductivity than a single coin. If they are all clumped together, you will get a large target reading that again will likely be a notch segment or two higher than what one coin would read. If they are scattered in the ground, you will get multiple target signals. As I said, the detector bases it's "analysis" on the surface area of the target(s) under the coil at any particular time.

Hunting for a cache in a 400 square foot area is not a difficult task compared to what many of us encounter in cache hunting. If I came across a "lead" that got me within a mile or so, I'd be very excited at the prospect. Remember, if it were easy to locate, it would have already been found. Hopefully in your case, it's still waiting for you. Best of luck in your hunt. JMHO HH Randy
 
The fact that you are looking for a box, does not mean you are looking for a box! Your 400sq ft area could be larger. A cache may be moved for one reason or another. Paranoia Plows Construction Natural Disaster

Think outside the box a little, Do a little research on your own.

Good Luck
Jeff
 
Guys, thanks very much for your insight.It has been very helpful. In the last few days, I have made my first "treasure map" .
Thanks again.
 
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