Centrifigul force and gravity helps prospecting at night

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Post  granite2 on Thu Oct 03, 2019 11:14 am

I once had a mate who had a wonderful theory on why we always seemed to find more gold at night. His theory was that the the centrifugal force of the earths spinning combined with the gravitational pull of the moon lifted gold nuggets near to the surface where we could more easily find them. Shocked Rolling Eyes Rolling Eyes Rolling Eyes Somehow it never occurred to him that if that was true we would all go sailing off into space.

Another prospecting mate explained why nuggets could be found scattered where you wouldn't expect them. He reckoned that when the earth was still volatile with volcanoes erupting everywhere that molten gold was thrown out of these volcanoes and when hitting water exploded into cooling particles which were the nuggets we were finding. Rolling Eyes Rolling Eyes Rolling Eyes

But another mate had a theory that nuclear bombs would not explode unless the weather conditions for an explosion were perfect.jocolor

We did get into some very strange conversations around the campfire while sampling the local port. Ah those were the days (about 35 years ago) when we were young and strong and life was still a big adventure.

I had some very strange detector mates back then. Smile but I guess those theories were not much stranger than the ones discussed on here over the last week or so.
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Post  Kon61gold on Thu Oct 03, 2019 12:54 pm

Yes Jim & what haven't we heard over the years. Either man walks with an open mind (doing research in order to discover the most likely cause of why things happen the way they do), or they go around an entire lifetime believing what they hear. (You know, like a horse with blinkers on, not being able to see left & right of what surrounds it).
Most here should all know by now that it is the drop in lower temperature, in turn decreases the ground mineralization (that invisible force field that blankets or drowns out the hearing & separating out a positive in ground target, distinguishing it from the surrounding ground noise). It should also be obvious to many by now that the lower the in ground mineralization, the greater the depths will be over a positive in ground target.
Mind you, I have gone out detecting midnight, when the temperatures were at around 30 degrees & the in-ground mineralization was just as bad as if it were 30 degrees centigrade by day. So it is not so much dependant on quieter detecting because of night time, but more so on the cooling down of the earths surface minerals as temperature drops.
This is why I believe gold is easier to hear at night time or early morning, when the temperatures are decreasing or at their lowest, before they start to rise, giving rise to mineralization affecting all VLF/Pulse Induction detectors .
BTW, those were the days, when we were in our 20's/30's that we could tolerate crap, or should I say ones imagination, to the point of no return, but now as we get older, I find that we have less & less tolerance for It.  Both interesting topic & well worth discussing.

Cheers Kon. T25


Last edited by Kon61gold on Thu Oct 03, 2019 1:07 pm; edited 1 time in total
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Post  joe82 on Thu Oct 03, 2019 12:58 pm

T31 sure it was the port mate Shocked Shocked Shocked in my experience of night detecting I have found the ground to be a lot more quiet with less heat the detector is able to be run with higher settings and more stable I no it makes the trash more easy V11 V07  to find

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Post  adrian ss on Thu Oct 03, 2019 4:16 pm

How about this idea?/

Gold electrical conductivity (resistance ) goes down as temp lowers at night , therefore eddy current generation increases in the gold.
   When the tecta coil is scanned over a gold nug or non magnetic material, the reactance of the tx coil will go down  because the transmitted field from the eddy currents flows against the magnetic field of the coil. As the  resistance of the gold gets less due to lowering temps at night resistance losses will be less and inductive reactance shifts will be greater, therefore eddy currents will become stronger creating more intense eddy current magnetic fields and therefore yez will detect gold deeper in the cold at night than in the heat of the day.. .......oooooor this might be just a load of chunder.  lol!  lol!
  Maybe if ya get a can of freeze spray from Jacar, Test the signal from a nugg and then freeze it and test again n see if there is a noticeable difference. I reckon there won't be which means that all that stuff I wrote is crap. Laughing Laughing
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Post  granite2 on Thu Oct 03, 2019 5:23 pm

You are right on the ball there, Kon. The ground is much quieter at night as it cools. We mostly did our moonlighting on private land (with permission) and open paddocks. We did quite well most nights.

Once when prospecting in WA we were doing well on a slope that was producing solid little nuggets up to 3 or 4 grams. I was using an 11" mono coil on an SD2200 and although the ground was a little bit noisy it was workable. It should be noted that the 2200 did not like a mono coil very much. After a long relaxing lunch the day had warmed up quite a bit and I found the same ground was unworkable with the mono. Replacing it with a 14"DD I found the ground noise to be almost gone and the gold again popping up.

Todays detectors are much less affected by hot ground making life much easier.

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Post  Alan WA on Thu Oct 03, 2019 5:41 pm



Another prospecting mate explained why nuggets could be found scattered where you wouldn't expect them. He reckoned that when the earth was still volatile with volcanoes erupting everywhere that molten gold was thrown out of these volcanoes and when hitting water exploded into cooling particles which were the nuggets we were finding. Rolling Eyes Rolling Eyes Rolling Eyes




I'm a supporter of this theory. I call it the cut artery effect.
Molten gold shot out kilometers and landing in a line of patches.
Sometimes with the odd bit landing in between. Thus forming the 1 bit patch.

: )]
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Post  Reg Wilson on Thu Oct 03, 2019 5:58 pm

Alan, you could do with a geology course. Unless of course you are pulling our legs.
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Post  Alan WA on Thu Oct 03, 2019 6:38 pm


Its just something that makes a bit of sense to me after 40 years wandering
round the bush.
You could be right about a formal course of course...
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Post  Nightjar on Thu Oct 03, 2019 7:20 pm

Alan WA wrote:

Another prospecting mate explained why nuggets could be found scattered where you wouldn't expect them. He reckoned that when the earth was still volatile with volcanoes erupting everywhere that molten gold was thrown out of these volcanoes and when hitting water exploded into cooling particles which were the nuggets we were finding. Rolling Eyes Rolling Eyes Rolling Eyes




I'm a supporter of this theory.  I call it the cut artery effect.
Molten gold shot out kilometers and landing in a line of patches.
Sometimes with the odd bit landing in between. Thus forming the 1 bit patch.

: )]

Looks like I'm in line for a geology course as well? However do agree with this theory, right or wrong.
Have mentioned here over years gone by about what we call "mini volcanoes" (There are photos on here some where) Small/low mounds of rocks that are unfamiliar in particular areas, they send the detector into a frenzy. Over the years we have found many throughout WA goldfields and invariably gold is found scattered nearby. The centres sometimes have an indent.
The experts claim they are the result of "Pebble Mice" activity? Considering the rocks are bigger than the mice and the source extends down deeper than a metre, (we actually spent a hour or three trying to dig one of these fissures out)
All that said and done if you come across one, low and slow, you won't be disappointed..

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Post  Reg Wilson on Fri Oct 04, 2019 8:42 am

Well, there we go. Two people who need to learn a bit about geology. If you don't feel inclined to take a course then at least do some serious reading.
It is easy to jump to conclusions when you read the signs wrong. An example of what appears to be but isn't..... A hare and a rabbit look similar, and one could be excused for thinking they are related, but, with DNA testing it is revealed that they are the product of parallel evolution, with the hare being more closely related to a cow than a rabbit.
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Post  Alan WA on Fri Oct 04, 2019 12:22 pm


Don't worry about it Reg.
I also support the theory gold is where you find it.

Very Happy
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Post  Kon61gold on Fri Oct 04, 2019 1:32 pm

Well I certainly can't add any more to that Alan, for gold will always be where you find it. Finding the right type of ground that actually holds/contains gold in, will always be the hard part.
Met a bloke out there once whilst prospecting on crown land in an area of scrub/tall grass & as I approached him for a chat, a large hare jumped out from his resting spot, camouflaged behind some bush & bolted off in front of us. The fellow then said to me, that's one large hare. Hare I said?  Yep he said, that's the "Father" of the rabbit. Shocked I was left in tears. Q35  One things for certain though, both the rabbit & the hare whilst similar in looks, but worlds apart in life style, taste just as good, in a well prepared stew. Shocked Q35

Cheers Kon. T25
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Post  geof_junk on Fri Oct 04, 2019 2:51 pm

Gold is not where you found it, unless you left some behind. Sad
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Post  granite2 on Fri Oct 04, 2019 5:21 pm

Where it is, there it is. Very Happy Embarassed


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Post  Kon61gold on Fri Oct 04, 2019 5:23 pm

Q24 Q25 Q35 T04 Q35

Cheers Kon.
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Post  hugh62 on Sun Oct 06, 2019 5:39 pm

Love these yarns coming in , yeah there's plenty of theories out there , Very Happy I've even got one of my own ,went out for a swing this morning and come home at lunch time to find it was 35 deg in the shade V51 and I've wondered this before ,why is it when you make a beeline for some shade ,and thoroughly search every bit of that shade ground ,and rarely get a signal ,then step back out into the sun ,and bang ,back onto signals again Rolling Eyes
              And why is it every time you need the crow bar ,it always the furtherist from your car pale
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Post  granite2 on Sun Oct 06, 2019 6:20 pm

I once went moonlighting with a group that included an old bloke who's eyesight wasn't as good as his tongue. Once started you couldn't stop him. This particular night it was a clear sky and full moon so bright you could read a paper by it. We were detecting away when I heard the old bloke start talking and sympathised with who ever he'd cornered. Half an hour later he was still at it. Looking around I counted all our group but the bloke the old fella was talking to was an extra. Intrigued, I worked my way over to a few yards away and burst out laughing. Someone had put their hat on a head high broken off sapling and the silly old bugger was still rattling away to it. He must have thought he was on a good thing because the stump wasn't interrupting him.Rolling Eyes

We actually did alright that night. We were on new ground and I found the prettiest 10 grammer I have ever seen, it simply glowed in the moonlight.
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