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PI and hot rocks

A

Anonymous

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A message to Eric, I just got back from a nugget hunt in AZ. My vlf/tr machine worked well but I had to dig every hot rock it crossed. I heard that PI machines can handle these very mineralized situations and is able to ignore hot rocks also...is this B.S.? After learning the first and last name of every hot rock in Mohave County, I am ready for some new technology to see through this very difficult soil. Guys with the SD 2200's had no problem out there and were able to ignore those pesky hot rocks... I think that these machines from down under are actually glorified PI machines, am I right?
 
Hi Brian,
Hope you don't mind my jumping in here with a comment or two. You ask Eric if a PI machine will ignore hot rocks better than a VLF machine and in general they will. However, there are still some types of hot rocks out there that the PI machine will respond to so it is not a complete panecea in this respect. It all depends on the area you are trying to work. I have an SD2200 as well as a Lobo Supertraq and a Goldmaster V/SAT and each of these machines has found gold for me. It's simply a matter of learning the strengths and weaknesses of your particular machine and useing it within those capabilities.
The LST does a better than average job handling highly mineralized ground and the Goldmaster with a double-D coil on it will give it a run for it's money. I found out a couple of weeks ago that the SD2200 was driving me crazy responding to highly mineralized ground that I was working at the time so I switched to my Lobo and found it to be much more stable for that particular area. Remember if you're hearing too much ground noise you have a very difficult time hearing those little whispers that might signal a good target.(Hopefully a nugget!)
Hope this is helpful in some way. Feel free to E-mail me if you have any other questions or comments. Regards, RD
 
Hi Brian,
Meant to ask you, what type of machine do you use now? RD
 
Hi Brian,
Yes, the SD2200D is a PI detector with ground balancing circuitry. Hot rocks can be either conductive or magnetic, or a combination of both. PI's will ignore conductive hot rocks, whilst other types of detector will pick them up. Magnetic hot rocks will generally give a signal on a straight PI. A fired clay housebrick will give a similar response. Provided the signal is not so strong as to cause overload of the receiver, a PI with ground balancing will ignore most hot rocks. I gather that the Minelab Extreme has modifications to prevent overload, but, so far, reports on this detector have been mixed.
Eric.
 
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