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phrunt

Qed - First Impressions

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I think the cracks/holes go all the way through, the reddish stuff on it could possibly be ironstone, it doesn't wash off so it's not some sort of soil. 

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Probably a combo of ironstone and fractures then.

Fractures, even partial ones, could in theory effectively cause a nugget to be 1/2 the size or less when viewed from a metal detector's reference frame even if the nugget is still connected with itself. If you have 2 fractures, then maybe 1/3rd the size. It all depends on the geometry though. Mag fields are also additive so there is the additional issue that fractures or even maybe other geometric irregularities can potentially cause destructive interference between two induced fields at different angles. Or at least not add up to the same field strength as it would if it were a whole nugget.

I'm just saying this based on the finite element modelling we did on iron and aluminum, but I think it would apply with gold too.

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2 hours ago, phrunt said:

I think the cracks/holes go all the way through, the reddish stuff on it could possibly be ironstone, it doesn't wash off so it's not some sort of soil. 

Does it stick to your magnet, or does your magnet slightly influence it? Could just be red stained quartz from mineralisation processes. 

JW?

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36 minutes ago, kiwijw said:

Does it stick to your magnet, or does your magnet slightly influence it? Could just be red stained quartz from mineralisation processes. 

JW?

No action at all on my magnet.  I guess it probably is just stained.  It's just so strange I can roll it around on the GPX coil and nothing at all.

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It's not all that uncommon Phrunt.

Most detectorists that use both VLF & PI detectors will have similar stories. It's a known fact that a higher frequency VLF (LF) like Whites GMT, Gold Bug, Gold Monster etc. will see some gold better than a PI will.

I had a small bit of gold that my GPX5000 (or a mates) couldn't see even on the coil but my Whites GMT picked it up no worries. At the time I was a bit perplexed as I had only recently shelled out for the then top of the range 5k. I soon found there was quite a few examples of this around & mainly on specimens where the gold was finely disseminated through the host rock or small prickly bits. I tend to agree with Jason above that your bit may have fractures/breaks in the gold making it a difficult piece for a PI.

The QED likely gets it due to the very low pulse delay utilised in mode 1. From memory it is somewhere in the range of ~7us - as a comparison the lowest pulse delay on Whites TDI Oz Pro was 10us. I believe there was a TDI mod for more sensitivity down to 8us. Of course there is more to the QED than just mode but a short pulse delay on those types of gold would be a big factor.

Be interesting to see if kiwijw's SDC can see it at all as well as his GPZ.

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Well JW and I tested my little invisible bit of gold on his GPZ and it didn't see it either, a tiny bit if you rolled it around on the coil.  I actually think the QED picked it up better than the GPZ as I get almost an inch on the QED and touching the coil on the GPZ and GPX nothing at all.

VLF's see it as if it's a normal bit of gold.

It's probably how I found it, JW's GPZ missed it and I swept it up with my Monster ?

I've found the Zeds kryptonite ?

 

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Guest AussieDigs

An X on the QED PL2 saw AU what JW’s GPZ n X couldnt see in NZ! ?

Time to head somewhere where the likes of the QED with X coil would be suited/not vacuumed by the formidable combination of JW, GPZ and X coil!

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There are certain odd geometries of nuggets which will hit deeper on the GPX than on the GPZ. I've found 6 or 7 with a quite pronounced effect, some were up to 15% or so deeper on the GPX. Up to 27 grams, so not just small bits. I'm sure I found more but I stopped checking. One of these I reported in quite some detail to Minelab but they didn't appear to have much interest so I stopped. 

I don't have them anymore as I sold everything, but they were...ropey/tangly? Not sure how to explain them. But divided up and with holes. Imagine pulling apart a grilled cheese sandwich and seeing the ropes of cheese, now imagine that about 5x denser and wrapped in on itself into a wad of gum looking thing, and that's the sort of gold these were.

Anyways, it's possible for a PI to hit something a GPZ will miss. Just not very common, and usually related to nuggets with breaks, open space, etc.

 

 

 

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