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A question for Eric.

A

Anonymous

Guest
After reading the Posts about the Goldquest SS in heavy mineralization I am wondering how it would work in a lake that the bottom is I believe primarily Magnetite. We have such a lake here in Northern NJ. No VLF's will work there and the only people that hunt it us PI's as they seem generally uneffected by it. But with the higher sensitivity of the Goldquest I wondered if it would be useable in this particular environment. I don't know of anyone in my area with a Goldquest or anyone who has tried a Goldquest in this lake. The reason I think the bottom of the lake is Magnetite is that if you have a magnet in your scoop to catch bobby pins your entire scoop will be a furball of this material when you come out of the lake. I found that out the hard way <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT=":)"> <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT=":)"> <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT=":)"> It was a mess trying to get it all off my scoop. Even though this lake is heavily used for swimming each Summer I have stayed away from it since I didn't have a PI. Anyway I was just wondering how you thought the Goldquest would work under those conditions. I am still on the edge trying to decide whether or not to give PI's another try and right now the Goldquest SS is the only one I would try if I did take the plunge <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT=":)">
Thanks
HH
Beachcomber
 
Beachcomber
Did you try out Houndogg's Aquarstar there ? If it was OK there, so be the Goldquest.
The fact that others are using PI's there, say's there shouldn't be a problem. Pulse Delay is a user adjustable setting.
I doubt that the one's, (PI's) being used now there are as sensitive as 15uS. so on a worse case senearo one would have to cut back on the pulse delay.This would not have a serious negitive affect, althought it would cut the sensitivity toward real low conductive items. A Goldquest SS set at, say 18/20uS.,would still have the edge over the units out there now opperating at the same.
Mr. Bill
 
Hi Mr. Bill. From what Eric had written about high minerlaization and the Goldquest vs high mineralization and other PI's and that there may be a need for a type of active ground balancing circuit to make it work better in high mineralization I thought I would ask. I don't know whether magnetite is considered high mineralization or if it falls into some other category. So I don't know if ti would have any effect on the Goldquest at all which is why I asked about it. Also to answer your question no Gary hasn't had his Aquastar in there. I told him where the lake is but the spirit hasn't moved him t check it out <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT=":)"> It's a 2.5 hour drive for me to go to this particular lake as I live in Southern NJ so I don't go there since I don't own a detector that will work there.
Thanks
Beachcomber
 
Hi Beachcomber,
If it is magnetite, then it is not a big problem for PI's. Magnetite conducts the magnetic field from the coil without giving any lag effects that result in a signal, even at 10uS sample delay. Other iron minerals are rather different and can result in strong responses. However, VLF induction balance detectors do not like magnetite at all, and to them it is high mineralisation. Depending on the levels of magnetite concentration, you may find that the detection range is a bit less than in normal sand. This is because the field from the coil tends to follow the path of least resistance through the magnetite and doesn't penetrate quite so deep. It takes a lot of magnetite for this to be noticed though.
Eric
 
Hi Beachcomber,
I have used my GQ clone in areas where the black sand is extremely concentrated and experienced little or no response. Usually when I do get a response, it is when the coil passes from the black sand to a clay base.
To the best of my knowledge, this black sand is magnetite. At least that is what I call it. Stick a magnet into it and you get a huge "fur ball" of the stuff. Now, I also have a tendency to call most of the heavy black rocks that are strongly attracted to a magnet, magnetite. Most of these also produce little response. If I do get a response, it is when the coil is almost right on top of the rock.
I have found a few rocks with "black chunks" that look like magnetite to me, that have generated a response, but it is a metallic response. I am not sure what the stuff was, but it would also jump to a magnet.
Generally speaking, I have found the areas that give a VLF fits do not cause a problem with a PI. On the other side of the coin, some areas that are not that obviously bad with a VLF will give a PI problems. Those places are the areas with red to orange to light brown clay type dirt.
The words "heavy mineralization" seem to mean different things when discussing different types of detectors.
Reg
 
Thanks Reg,
As I have been reading this Forum for quite awhile now I had come to the same realization about the words "heavy minerization". Which is why I had asked this question.
HH
Beachcomber
 
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