Newbiew needs help finding family cache

[bakergeol]

It may be more difficult than you think if his father did not bury it in a metal container. The last time I looked no detector was able to detect Carl's 3 lb (220 quarters) cache test(no metal just coins)at 24". Carl's and Gary's cache tests kind of destroys our past thinking on coin cache detecting in non metal containers.

http://thunting.com/geotech/forums/showthread.php?t=11831

To answer your question- Why so difficult? It is because the detectors will not see the mass of coins as a solid mass but as individual coins. It can be done- the key is the gold coins and the correct detector.

I vote with Monty's idea.

George

I think his testing was flawed. I use a Whites 6000 Di Pro. I put my 15" coil on and tried my detector in all modes. Standard motion discriminate, I got a shocking 16 inches on my bag of 41 silver dollars. I was shocked at how little "air" depth it showed. Then I tried it in the TR mode. Here I improved to 29 inches. Then I put it into GEB (all metal-no motion) and got a reading out to 37 inches.

This air test would be about equal to the test listed in the link as far as amount of loose silver coins. If I can get 37" in an air test, I have NO doubts about picking it up at 24" in the ground. The tester never made any mention to what operating mode his detectors were in, or how the controls were set.

TD

PS- I think I need to seriously rethink what mode I use my detector in.

Well here is some of the detectors he used.

White's 6000/di Pro with 15" coil
White's 6000/di Pro with 24" Magnum "cache" coil
Fisher Gemini 3
Discovery TF900
Minelab 2200/d with 18" mono coil
Garrett GTI2500 with Bloodhound attachment
Teknetics T2

You will notice that he used your 6000/di Pro with both coils (15" and 24") and could
not locate the cache. I don't know the answer here- Perhaps air tests are worthless(like air coin depth tests) compared
to ground tests such as Carl performed. Size of Silver dollars makes a difference? Or your opinion that his testing
was flawed.
It would be interesting to find out what the real answer is.

George

 

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[TheDetectorist]

WOOHH!! Lot of dead space at the end of that reply!

I know he used an 6000, I did read the entire linked thread. I question HOW he used the detector. The 6000 is one of the most versitile detectors ever made. I question if he just put it into the normal "disc" setting, and said "yep, it doesn't read it", or if he actually made adjustments like I did. Air tests aren't worthless. You just have to understand how much signal gets eaten by your local mineralization in the ground. He also disregarded the PI machines. You can't do a test like this and just ignore one of the major circuitry types. That's like saying "I want to see how fast I can drive, but I don't want to test a Ferrari. I'll just see how fast I can go in my 75 ford pickup."

TD

 

[bakergeol]

WOOHH!! Lot of dead space at the end of that reply!

I know he used an 6000, I did read the entire linked thread. I question HOW he used the detector. The 6000 is one of the most versitile detectors ever made. I question if he just put it into the normal "disc" setting, and said "yep, it doesn't read it", or if he actually made adjustments like I did. Air tests aren't worthless. You just have to understand how much signal gets eaten by your local mineralization in the ground. He also disregarded the PI machines. You can't do a test like this and just ignore one of the major circuitry types. That's like saying "I want to see how fast I can drive, but I don't want to test a Ferrari. I'll just see how fast I can go in my 75 ford pickup."

TD

I went back and reread the last posts to see it anything had been resolved. Carl still has not found a detector to detect those quarters which was similar to Garys testing in the UK. He did post some results with the T2 which implies he is using "disc" and AM modes in his testing. He mentioned he could detect a single quarter at 12" in disc and could detect the cache at 22" in AM mode.

Apparently I was incorrect when I said the detectors "see only individual coins". What they see is dependent on the coin to coin contact but again they do not see the complete mass. This is why the T2 would see a single quarter at 12" and the cache at 22". Right now I am leaning toward coin size as the reason you could detect your silver dollars deeper. Mass of metal for coin to coin contact with silver dollars would be incredible compared to quarters. I bet that if you tried to duplicate Carl's test with quarters or even smaller coins on your detector you would receive similar results as what Carl achieved.

Regarding PI's. Well they are mainly designed for low conductors such as gold and their TX pulse would be too short for a cache of high conductive silver at 2 feet. A low conductor like a nickel is detected a lot deeper than a high conductor quarter with my GS5 which uses a pulse delay of 10uS.(Maximun signal requires above 800uS for a quarter). Here is a quote from Eric Foster.

"My experience with a quantity of coins is that the decay time for the quantity, is much the same as for a single coin, because of the relatively poor electrical contact between individuals. What does go up though, is the amplitude, because of the larger effective surface area."

This is why my GS5 can detect 10 nickels in a small plastic container at 21 inches with the stock 11" coil which is several inches deeper than an individual coin. It would likewise be hot on small gold coins which are also low conductors. For a cache of small gold coins- a PI would be my choice particularly in mineralized ground.

There are a lot of unresolved issues. If coin to coin contact is important would coin corrosion play a factor in depth of detection? Would smaller coins(dime sized) caches be more difficult to detect than quarter sized or silver dollar sized caches.

George

 

[TheDetectorist]

Hmmmm, wish I had more silver quarters to test this better myself. I can see that the larger surface area per coin of my dollars could have given a deeper reading than if I had used quarters....

TD

 

[Kentucky Kache]

You can buy a 2 box detector..... I bought a Gemini 3 from Kellyco for $599.99 depending on the size of the cache they can detect up to 20 ft deep.

Good luck and I hope you find it, keep us posted!!!!!

Best of the Season,

Chagy........

20 feet if your looking for something the size of a car.
Fruit jar size, 1-3 feet.

 

[74BRONC]

What are some good PI detectors to consider looking at?
I just got my GTI2500 and it cannot find a one pound coffee can that is 3 feet down Im a little disappointed in this I was hoping for better results than this.
Does anybody have any tips or recommendations for running this machine in the all metal mode I can’t seem to figure this out the thing goes off all the time just running it over the ground.

 

[chong2]

did you go to radioshack for advice?

 

[tammahawk]

any metal detector on all metal mode should shoot a large object at 2, 2 1/2, ft my ace 150 would be able to find it and its the low end of the garrets,tammahawk

 

[lou423]

Look for a spot where the ground is soft and easy to dig...
Maybe you can borrow or rent a detector with a large coil...
Go to the nearest dealer and see if he can recommend someone to help you...of course offer a reward
if that person finds what you are looking for.