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The Gpx6000 Adventure Begins!


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1 hour ago, phrunt said:

Sorry to swing your thread into a headphone discussion Aureous.  Hopefully your next outing with the GPX is just as successful as this one was, faults aside the detector itself is pretty awesome and if all your days are as good as that one you'll have your goal of paying off the GPX done pretty quickly.  I know how well you did with your 24k, and your GPX should produce the goods too so please do your gold found posts so we can follow your progress, maybe we need to get the tally going to record your statistics ?

All good mate, I think we all need to know our expensive new toy is working to spec. I almost had a dud day today, tried the 6000 at a different spot where I got a heap of small gold in 2020/21 and aside from one tiny .05gm bit, all I got was 62 bits of lead shot + a few other random bits of junk....all targets I missed and any one of which coulda been gold. But, the ground here is very shallow so perhaps I shouldn't be too surprised. I'll dodge the rain tomorrow and go to a different spot....I'm trying to get a feel for the right ground conditions and I should get the tally running better soon. 

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I already had value tied up in my other detectors which were for sale, so all I needed was $3K (which I paid for in saved gold). Rough scrap value is AU$80 per gram so I rounded it up to 40 grams to keep track. I bought a box n screen cover set also which was $100. 

Not the first but all upgrades of gold equipment. I like to pay with the finds of previous equipment. That way the hobby has paid for it self. .........   A fact, it seem, most top of the line Gold Detectors release price seems to be about 4 Ounces over the 40+ years.

 

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2 minutes ago, Aureous said:

one tiny .05gm bit, all I got was 62 bits of lead shot

This really confuses me as it is what I am finding too (although your ratio for today is quite extreme unfortunately!).  

Why is the GPX6 picking up all of this lead shot that has been previously missed but not getting a similar amount of missed, small gold? 

Or perhaps the question is, why did the previous detectors miss a lot of the lead shot but seemingly found the majority of the gold?  

It perplexes me  ?‍♂️

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3 minutes ago, Northeast said:

This really confuses me as it is what I am finding too (although your ratio for today is quite extreme unfortunately!).  

Why is the GPX6 picking up all of this lead shot that has been previously missed but not getting a similar amount of missed, small gold? 

Or perhaps the question is, why did the previous detectors miss a lot of the lead shot but seemingly found the majority of the gold?  

It perplexes me  ?‍♂️

Because the GPX has a very loud target response on small very close to the coil targets, the very loud response it has falls away quickly as they get deeper.  It's hyper sensitive to targets close to the coil.   Gold gives a much better target response than pellets so the other detectors likely got it, those round lead targets are hard to hit, especially smaller ones but the GPX likes them.

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1 minute ago, phrunt said:

the very loud response it falls away quickly as they get deeper.

Yeah, that was my thinking too.  I nearly posed this question last night when Aureous put up his gold/lead tally but thought better of it.  

Lead shot is more likely to be closer to the surface and therefore get the hit whereas the gold being a bit deeper, does not.  But it is still a crazy ratio.  And it's amazing that a 7000, 5000 or Aureous's modded 4500 with a spiral coil didn't pick up at least some of those 62 bits he got today.  

?

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#9 lead shot is 0.047 of a gram, the GPX 6000 will not get a response from a #9 shot even touching the coil, yet it'll find 0.047 of a gram nuggets all day long easily with quite a decent target response at pretty good depth.

I'm sure my GPZ would have picked up many of those pellets his 6000 got, but the stock 7000 coil isn't too sensitive to smaller lead pellets though with minimal depth on them and the 4500 isn't too sensitive to many pellets at all, mostly the steel ones get sucked up by it with ease and the larger size lead ones.

I'm surprised his 24k didn't get them all though ?

Shotgun pellets might get refreshed too, they sure do around here, just when you think they're all gone more appear ?

All detectors love the modern steel ones.

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6 minutes ago, phrunt said:

#9 lead shot is 0.047 of a gram, the GPX 6000 will not get a response from a #9 shot even touching the coil, yet it'll find 0.047 of a gram nuggets all day long easily with quite a decent target response at pretty good depth.

I'm sure my GPZ would have picked up many of those pellets his 6000 got, but the stock 7000 coil isn't too sensitive to smaller lead pellets though with minimal depth on them and the 4500 isn't too sensitive to many pellets at all, mostly the steel ones get sucked up by it with ease and the larger size lead ones.

I'm surprised his 24k didn't get them all though ?

Shotgun pellets might get refreshed too, they sure do around here, just when you think they're all gone more appear ?

All detectors love the modern steel ones.

Yeah thats quite true, the lead shot size versus same gold size (weight) provide a different target response for sure.... the gold is denser perhaps, giving a much better eddy current to the receive circuit on the detector. Just my educated guess... My modded 4500 with the 9" Elite mono could ping lead shot down to No.7.5 but some I got with the 24K, the 4500M couldnt get at all. I have tested several 6's and 7.5's that sound way better than others and at a guess, I'd say they have higher antimony % alloyed with the lead. 

The 24K could easily get 50% of  the lead shot I found today (less than an inch depth) but, the noise from a high frequency VLF is very tiresome after a few hours....

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I found that small lead pellets that are buried for a long time have a thick oxide layer on them which might effect their eddy currents, requiring a more sensitive detector to small buried targets to pick them up.

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Not all lead shot of equal size has equal composition. The non toxic shot is made of a wide range of varying alloys and even plastics. Some detectors miss some of these entirely, while other detectors can hear certain ones but not others.

This is a big reason some places light up with new shot when using a new detector. They look like lead by eye, but they aren't necessarily lead and their conductivity is highly variable. At least, in the US this is the case, not sure about what is used overseas.

Non-toxic shot types approved by the US Fish and Wildlife Service[19]
Approved shot type Percent composition by weight
Bismuth-tin 97% bismuth, and 3% tin
Iron (steel) Iron and carbon
Iron-tungsten Any proportion of tungsten, and >1% iron
Iron-tungsten-nickel >1% iron, any proportion of tungsten, and up to 40% nickel
Tungsten-bronze 51.1% tungsten, 44.4% copper, 3.9% tin, and 0.6% iron, or 60% tungsten, 35.1% copper, 3.9% tin, and 1% iron
Tungsten-iron-copper-nickel 40–76% tungsten, 10–37% iron, 9–16% copper, and 5–7% nickel
Tungsten-matrix 95.9% tungsten, 4.1% polymer
Tungsten-polymer 95.5% tungsten, 4.5% Nylon 6 or Nylon 11
Tungsten-tin-iron Any proportions of tungsten and tin, and >1% iron
Tungsten-tin-bismuth Any proportions of tungsten, tin, and bismuth.
Tungsten-tin-iron-nickel 65% tungsten, 21.8% tin, 10.4% iron, and 2.8% nickel
Tungsten-iron-polymer 41.5–95.2% tungsten, 1.5–52.0% iron, and 3.5–8.0% fluoropolymer
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