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GPZ 7000: Threshold Vs Sensitivity Vs Volume Vs Volume Limit (with Discussion On Audio Smoothing, Coil Control, Range Of Motion And Manual Ground Balance)


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3 hours ago, Jonathan Porter said:

Wowsers nice chunk!! Knowing the country you work that piece could go anywhere from 8 to 16 ounces? 

I use Manual a lot if the conditions allow or call for it. Outright depth is always achieved by using a fixed or manual ground balance, in the case of the GPZ and its stupidly linked Quick-Trak to the ferrite calibration this means going in and out of Manual and Semi-Auto modes via the menu. If your lucky enough to work in an area where X signal is not an issue then obviously you could use the QT button and speed things up. 

So yes in homogeneous ground where the GB is not altering much over a larger footprint I will definitely operate in Manual GB mode especially when using the larger coils. A prime example is the gully washes up in FNQ and the Kimberlies in WA and also some areas over in the Pilbara in WA.

JP 

 

Thanks for the reply mate.

It goes just over 10oz and scans 99%Au on the XRF scanner. It came from a remanant alluvial deposit left on top of a low hill far from the current stream. The ancient probably tertary age river had cut a iron rich auriferrous chert filled fault and the deposit sits on a calcium and chlorite rich green colored schist type bed rock. The calcuim is fairly mobile so it sweats into the lower layer in the alluvium and the lighter sands and clays have weathered away leaving the heavier Iron from the cherts, causing patchy vairiable noisy ground. The only indicator (without digging a hole) that the deposit is there was one out of place alluvial stone that I noticed on a lower sloap of the hill but dig a hole at the top after a foot of clay its full of heavy alluvial stone. I was quite supprised at the purity when I scanned it as this area is not known for gold as its a tin area. I looked here as I identified a type of anomally that I have found a lot of gold around before by using specialist satellite imagery.

I have the same GB modus operandi. After locking the ferrite balance in semi auto when the detector goes out of balance I just flick into semi auto and back track over the targetless already detected ground to balance the detector again if the ground dictates.

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I hope that nugget is left 'as is' when it was sold or have you kept it?

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6 hours ago, mn90403 said:

I hope that nugget is left 'as is' when it was sold or have you kept it?

Melted it today.

I just melt them all now, I just couln't be bothered trying to sell as is. The only gold I dont melt now is crystal gold.

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3 hours ago, Gold Hound said:

Melted it today.

I just melt them all now, I just couln't be bothered trying to sell as is. The only gold I dont melt now is crystal gold.

I understand the reasoning. But it would break my heart having to melt such a wonderful nugget. Unless of course I would find them all the time....

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6 hours ago, Gold Hound said:

I just melt them all now, I just couln't be bothered trying to sell as is.

(amateur detectorists jaw's dropping all over the world - haha)

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On 3/1/2021 at 12:16 AM, Gold Catcher said:

I understand the reasoning. But it would break my heart having to melt such a wonderful nugget. Unless of course I would find them all the time....

A Mate from my area held a nugget for 2 or 3 years trying to get a good price for a solid 96 oz nugget. At the time gold was about $800 AUD an oz. When the price went up a bit he let it go for less than 10% above gold price.

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