northwest Hot rock area strategy
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australian electronic gold prospecting forum.com  |  Common interest forum.  |  General chat and discussion forum (Moderator: bugwhiskers)  |  Topic: Hot rock area strategy 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Hot rock area strategy  (Read 201 times)
Goldman
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« on: Thursday May 24 2018 16:15:18 AEST PM »

Does anyone have a strategy for dealing with ground absolutely littered with hot rocks.

Cheers Goldman
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bugwhiskers
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« Reply #1 on: Thursday May 24 2018 16:20:52 AEST PM »

  
Does anyone have a strategy for dealing with ground absolutely littered with hot rocks.

Cheers Goldman

I have seen hotrocks that when treated with Hydroflouric Acid reveal lots of small nuggets. Pick them up and using the sun see if there are any glints. Try different modes to see if that helps.
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Doug
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« Reply #2 on: Thursday May 24 2018 16:24:25 AEST PM »

  
Does anyone have a strategy for dealing with ground absolutely littered with hot rocks.

Cheers Goldman

Try Gb' ing on the hot rocks and /or raise the height  of the coil above the ground.(this will result in a loss of depth/sensitivity- their is no free lunch) and/or increase the mode. Hot rocks can often give a huge signal with the coil on the ground but lift the coil a few inches and the signal intensity  usually drops off dramatically.
doug smile
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dasenator777
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« Reply #3 on: Thursday May 24 2018 19:14:18 AEST PM »

asdoug said balancing on hot rock usualy works, has for me anyway,  smile
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geof_junk
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« Reply #4 on: Thursday May 24 2018 19:18:31 AEST PM »

As Doug said "Try Gb' ing on the hot rocks and /or raise the height  of the coil above the ground." do this  but as the ground balance will not be 100% for the ground, remember to swing a bit slower and keep a constant coil height over the ground.
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GARY
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« Reply #5 on: Wednesday November 14 2018 14:11:58 AEDT PM »

Was out just recently using the QED with Commander 11" mono over some ground that had previously been cleared to expose a surface layer of whitish type clay with orange colour rocky type intrusions exposed in various places at the surface and slightly beneath the surface once the surface was scraped away with the pick.

The ground balance figure for the clay was not all that high at 107 however once I encountered a orange rocky type intrusion it produced a rising response to the QED. I manually pressed the down arrow button to lower the GB figure from 107 down to 103 and the response from the intrusion disappeared. Once I passed by the intrusion and back onto the clay I manually raised the GB figure back up to 107 until another intrusion was encountered.

After I detected another rising response intrusion it occurred to me why not leave the detector set at 103 that allowed me to cancel out any intrusions and see if I can continue to detect without a response from the clay even though the clay produced a higher GB figure.

Well the detector appeared to have no further issues from this particular type ground.

The QED settings were THS-B: 48, THS-A: 60, GAIN: 1 & MODE: 6.

Gary.
  
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bugwhiskers
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« Reply #6 on: Wednesday November 14 2018 17:41:58 AEDT PM »

The attached file is the lapsed WIPO patent by George Paltoglou.
Like many other GB patents it uses sample periods and a subtraction/null summation electronic circuit akin to an old fashioned balance beam as disclosed in a 1968 paper by Eric Foster.

After the TX signal, the ground minerals take time to decay as do any targets within the ground under the coil. Both the ground and target if present control the shape of that decay. If you take an old fashioned photo of that decay curve then using a pair of scissors to cut it vertically into slices it is possible to get the width of the slices correct so that when placed alternately on the sides of the balance beam they balance (are equal). There is however a fly in the ointment. The total width of the left hand samples must equal the total width of the right hand side samples to null the signal from the Earth Field and Magnetic soil simultaneously.


Currently the QED uses 2 short TX and 1 long TX to differentiate. The Paltoglou patent mentions using 3 different widths. When time allows I will try it out and if successsful at handling highly variable ground/hot rocks, add it to the QED "MODES"


* Early_Paltoglou_WO9931529A1.pdf (1151.53 KB - downloaded 13 times.)
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« Reply #7 on: Wednesday November 14 2018 17:50:43 AEDT PM »

  
The attached file is the lapsed WIPO patent by George Paltoglou.
Like other many other GB patents it uses sample periods and a subtraction/null summation electronic circuit akin to an old fashioned balance beam as disclosed in a 1968 paper by Eric Foster.

After the TX signal, the ground minerals take time to decay as do any targets within the ground under the coil. Both the ground and target if present control the shape of that decay. If you take an old fachioned photo of that decay curve then using a pair of scissors to cut it vertically into slices it is possible to get the width of the slices correct so that when placed alternately on the sides of the balance beam they balance (are equal). There is however a fly in the ointment. The total width of the left hand samples must equal the total width of the right hand side samples to null the signal from the Earth Field and Magnetic soil simultaneously.


Currently the QED uses 2 short TX and 1 long TX to differentiate. The Paltoglou patent mentions using 3 different widths. When time allows I will try it out and if successsful at handling highly variable ground, add it to the QED "MODES"


Look forward to the  results.
doug smile
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bugwhiskers
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« Reply #8 on: Wednesday November 14 2018 18:01:01 AEDT PM »

The "Holy Grail" of ground balance is tolerance for an extreme range of soil types and the occasional pesky hotrock.
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GARY
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« Reply #9 on: Wednesday November 14 2018 20:02:12 AEDT PM »

Just for the record my GPX5 operating with the GB set to fixed (which I prefer) over the same ground produces a response on the same hot rock type intrusions requiring a Re-GB. The QED appeared to require a once only manual GB figure adjustment.

As far as I am concerned my GPX5 does not operate a mono coil with the GB set to tracking as well as a GP3 in tracking, that I owned previously.

Gary.
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australian electronic gold prospecting forum.com  |  Common interest forum.  |  General chat and discussion forum (Moderator: bugwhiskers)  |  Topic: Hot rock area strategy « previous next »
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