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Best coil for deep silver

H

homebre

Member
What would be the best coil for a 705 for deep silver coins in moderately mineralized soil (GB mid 20's)?

thanks,
Andy from NC
 
With ground balances in the 20s I would use a 10.5 ,7.5khz coil.
 
GB numbers in the mid 20's with a stock 7.5kHz 9" concentric?
If so, and you want max depth, one of the 15" DD coils will do it. Likely the 15" MF DD.

FWIW, Minelab is now producing the coils that Coiltek developed for the Xterra except the 6" 3kHz DD "Digger" (Coiltek is still making & marketing the Digger).
http://minelab.webtemplate.com.au/boylen/27175/__files/f/11792/KBA%2002-5%20Coil%20Selection%20Guide.pdf.
 
Just bought a 705 and the Minelab 15" 3kHz Coil. I only have about 6 hrs on it but so far I'm impressed with
It's performance on silver.
It hits on deep silver as good or maybe better than my CTX with the 13x17" Coil attached.
I have found 4 silver dimes from 8 to10". The park I hunted GB at 23.
i also found several wheat pennies at those depths but the silver seems to really sing compared to the pennies.
I need more time on it to see if that was just a coincendence or if there is something really going on there.
The tones are real nice on silver but some of the VID numbers jumped around a lot except the last one I dug.
It was a full measured 10" and came through as a solid 44 with beautiful tones. It was a thin slick Merc dime!
I was impressed.
The down side is it dosent hit on nickels nearly as hard. I found a V Nickel at 8" but the only reason I dug it is because I found it in prospect mode.
It only gave an occasional mid tone blip now and then when checked in Coin mode. I would have missed it if I was hunting in that mode.
Bryan
 
Congratulations Bryan! Sounds like you have a winning combination there.
Good to hear that it does not hit on nickles.
I hate pennies and nickles.
Awesome! Keep up the great work, and thanks.
HH Kev :crazy:
 
I find quite a few nickels with mine, but it's the audio that gives 'em away.
War nickels are another story. They tend to sound off pretty reliably.


Coincidentally, the first REALLY deep coin that I found with it in Prospector mode was a nickel....a Buffie.
 
Bryan V said:
Just bought a 705 and the Minelab 15" 3kHz Coil. I only have about 6 hrs on it but so far I'm impressed with
It's performance on silver.
It hits on deep silver as good or maybe better than my CTX with the 13x17" Coil attached.
I have found 4 silver dimes from 8 to10". The park I hunted GB at 23.
i also found several wheat pennies at those depths but the silver seems to really sing compared to the pennies.
I need more time on it to see if that was just a coincendence or if there is something really going on there.
The tones are real nice on silver but some of the VID numbers jumped around a lot except the last one I dug.
It was a full measured 10" and came through as a solid 44 with beautiful tones. It was a thin slick Merc dime!
I was impressed.
The down side is it dosent hit on nickels nearly as hard. I found a V Nickel at 8" but the only reason I dug it is because I found it in prospect mode.
It only gave an occasional mid tone blip now and then when checked in Coin mode. I would have missed it if I was hunting in that mode.
Bryan
Click to expand...

Wow the 3khz makes that much of a difference. A nickel 8" down can be gotten by a lot of machines with an 8"-10" coil, in disc mode. Sounds like it really does gear the machine towards high conductors.
You see this is what I don't understand about metal detectors. While something attributed to the way a certain metal detector performs means apparently nothing on another metal detector.
Examples being, say my Shadow X5 which I think is somewhere at 19khz, can get me nickels, dimes and pennies at the beach 10" plus all day long. And then look at the detector pro series which runs at a super low I think its 2 or 3 kHz?, can hit some pretty small chains and is also equally good at high and low conductors. There are several detectors, single freq, which seem to break the rules....
Good luck with this coil Bryan, sounds like its gonna get you some deep silver.
Weight wise, how does it feel say compared to your 3030? Does it make the 705 feel really front heavy?
 
Neil said:
Wow the 3khz makes that much of a difference. A nickel 8" down can be gotten by a lot of machines with an 8"-10" coil, in disc mode. Sounds like it really does gear the machine towards high conductors.
You see this is what I don't understand about metal detectors. While something attributed to the way a certain metal detector performs means apparently nothing on another metal detector.
Examples being, say my Shadow X5 which I think is somewhere at 19khz, can get me nickels, dimes and pennies at the beach 10" plus all day long. And then look at the detector pro series which runs at a super low I think its 2 or 3 kHz?, can hit some pretty small chains and is also equally good at high and low conductors. There are several detectors, single freq, which seem to break the rules....
Good luck with this coil Bryan, sounds like its gonna get you some deep silver.
Weight wise, how does it feel say compared to your 3030? Does it make the 705 feel really front heavy?
Click to expand...

I haven't ran this setup long enough to give a difinitive opinion on its nickel performance but I was surprised at its week signal on the V nickel at that depth after seeing it hit so hard on deep copper and silver.

As far as weight it definitely feels lighter than my CTX/17" coil setup.. It swings better than I thought it would.
The Coil is center mounted which helps a lot but after 2 hours of swinging, I went back to my truck for the bungee...
I won't swing my CTX/17" combo without a bungee for any length of time.
 
Neil said:
Wow the 3khz makes that much of a difference. A nickel 8" down can be gotten by a lot of machines with an 8"-10" coil, in disc mode. Sounds like it really does gear the machine towards high conductors.
You see this is what I don't understand about metal detectors. While something attributed to the way a certain metal detector performs means apparently nothing on another metal detector.
Examples being, say my Shadow X5 which I think is somewhere at 19khz, can get me nickels, dimes and pennies at the beach 10" plus all day long. And then look at the detector pro series which runs at a super low I think its 2 or 3 kHz?, can hit some pretty small chains and is also equally good at high and low conductors. There are several detectors, single freq, which seem to break the rules....
Click to expand...
One thing to keep in mind, is that the Xterra is the only all digital detector, which makes it nearly impossible to directly compare to any others but a CTX which shares V-Flex technology developed for the Xterra.
 
What is your bungee set up please share
 
Crash67 said:
What is your bungee set up please share
Click to expand...

I just bought the Minelab Pro-Swing 45 Spares Kit and use the bungee and the clip
from the kit and hook it to the D ring on my small back pack shoulder strap.
Works great plus I can carry water, snacks and extra batteries.
I use this setup with my CTX 3030 13x17" Coil setup which is a beast. It handles it very well.
I have become addicted to this setup and use 95% of the time.
 
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