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attn Eric. Vanishing hotrocks.

A

Anonymous

Guest
I planned to send a parcel of OZ hotrocks to Eric for research purposes, oh how generous I am !(haha), so I went back to my magnetic red clay patch and put my 10" elliptical mono coil on, which is deadly for hotrocks. The patch is all back-filled now and I figured on easily getting a dozen hotrocks in 10 minutes. Wrong !. I actually had to hunt hard for the blighters and the dirt was as quiet as a mouse. By breaking up the ground with the Cat966, there is no doubt that I have de-magnetised the ground and even the hotrocks which gave me a headache last week are now significantly weaker. Minelab convinced us prospectors that the SD's would go deeper in un-disturbed ground due to its conductivity, but I can assure everyone that in the case of magnetic ground this is not so. Break up the magnetic ground and the SD performs much better. So how do we go about de-magnetising the ground in-situ ?. Atom bomb, Steve ??. Cheers, Chris Hake.
 
Hi Chris and All,
What could be happening is this. The hot rocks form a magnetised mass in which each individual rock is magnetised so that it adds to the field of its neighbour. i.e all the north
 
Hi Eric and Chris
I had a discussion with a client in W.A some time back about trash on his detecting spot,which carried alot of gold but was hell to work because of all the little bits of tin on the ground.I made the suggestion he needed a magnet on wheels with a plastic sheet covering the face so you could remove the peebles and rubbish,every so often.His reply to this suggestion was that ground would be unworkable for some time.
Another point that I have noticed that is often I have brought back home rocks that sound like that they have the Welcome Stranger in them,only to find that it has dissappeared,so they are hot rocks one day and not the next.So when Eric receives them on the other side of the world and the earths magnetic might have changed them.
Regards Frank Wallis
 
Thank you first of all to Chris for bringing this matter up and a big thanks goes to Eric for his explination!! I have learned a lot at this site and I very much appreciate it all being put into terms us non- eltro wizz types can understand.
 
I concur with you Eric that the whole iron rich red clay mass plus the hotrocks therein have become magnetised over time by the earths field. Once broken up, the red clay is immediately demagnetised while the individual hotrocks retain their field for some time, although they soon lose it because they are mostly now non-aligned with the earths field, ie their N/S poles could now be facing E/W. Knowing this is one thing, but doing something about it is another thing !!. The CAT966 disturbance option seems to be the only answer at this stage, unfortunately. How about electromagnetic poles driven into the ground E/W of where we detect ? . This could temporarily upset the natural N/S magnetic alignment . Clutching straws eh !:eek:). Cheers, Chris Hake.
 
HI Chris
There is a device that was being made by Compass called a depth doubler. This thing used rods pushed into the ground and then hooked up to some sort of electromagnetic generator and was said to enhance the magnetic properties of the targets and allow detection at deeper depths. It would be interesting to try one of these devices and see if they will upset the magnetic and mineralised ground effects. As long as it is an alternating power source it should not make things more difficult to detect on but whether it would destroy the hot spots etc would be interesting to find out. One word of warning is that Compass now makes whichcraft detectors so I dont know if their claims ate to be believed.
Next time I get to the goldfields I intend doing some experiments using a 240 v generator and see what happens, might only fry a few worms, dont know???
Cheers
Steve D
 
Steve, You mean to tell me that worms can survive in soil like that? Dave. * * *
 
Hello All!
I wonder if a tractor towing a "Discer" would break up the signal?
 
I would have thought that it was something simple
like the long term corosion of the iron particles
in the soil forming a combined halo affect, being
disrupted by moving the soil allowing better
signal penatration.
Same with the dissappering hot rocks.
Has anyone tried soaking them in water to see if
they become hot again?
Curious.
 
Hi Steve,
How annoying! I passed up a 75uF, 2.2kV capacitor that was being sold on Ebay a couple of weeks ago. I think it only went for about
 
Eric,
For one horrific moment I thought that you were describing the transmit section of your "Beachburner" detector!!! Dave. * * *
 
Hi Eric and Dave
Food for thought. Your method would certainly have more penetration that a 240v system but as you say could certainly be somewhat hazardous. I dont like playing around with high voltage devices all that much. Did do a few experiments with high voltage valves many years ago but prefer a simple 12v transistor these days.
Yes the Compas company is the same company but run I beleive by different people.
 
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