The Gpx6000 Adventure Begins!

[Aureous]

Bit better day today, 9 more bits of gold for 1 gram exactly, 35 bits of lead shot, a .22 bullet and 8 other bits of various other junk. Had a run of luck (all bad) where I dug 22 lead shot one after the other without any gold....was very annoying. But Oh well, another gram down, 37.3 to go....

[phrunt]

Fantastic, you're on a roll! Let's hope it continues.  37 grams to go, should have that cleaned up in a month or so with any luck at this rate. ?

[geof_junk]

Back in the day, most people could not register a shot gun pellet. The old Garrett's, Whites etc technology allowed ? you to chase gold not lead. This modern tech needs to follow suit. ?

[Aureous]

I am wondering more and more...how will the various aftermarket GPX6000 elliptical coils sound? With the narrow field width, I am anticipating a sharper signal on smaller targets....the 11" is so mild with audio response (but still obvious) that I'm hoping the NF 12x7 will be sharper...

[phrunt]

19 minutes ago, Aureous said:

I am wondering more and more...how will the various aftermarket GPX6000 elliptical coils sound? With the narrow field width, I am anticipating a sharper signal on smaller targets....the 11" is so mild with audio response (but still obvious) that I'm hoping the NF 12x7 will be sharper...

This video might give you a bit of an idea, it's a 10x6"

For small nuggets regardless of coil brand I think we're in for a treat when it comes to these smaller coils on little gold, I only wish my GPX had the stable operation of this one in the video.

[Aureous]

Outstanding audio response! My 6000 sounds very similar, quite calm and stable....although today I was at a high EMI area due to a power line about 50m away. I might trial the 14DD tomorrow and see how well it handles underneath the powerline. 

[Steve Herschbach]

On 5/11/2022 at 4:05 AM, geof_junk said:

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.

Yes, this. Clean lead is one thing, but since this game is about surface eddy currents, the surface skin is the key. Lead will turn almost pure white with time, and create a thick oxide layer. Gold on the other hand is incorruptible, and if anything impurities may leach out, creating a pure gold skin. I suspect small pure lead pellets may sometimes convert completely in some soils, turning into lead oxide pellets, and become undetectable in the process. From https://www.sciencedirect.com/topics/chemical-engineering/lead-oxide

"Since lead oxides are semiconductors, their conductivity depends on the defects in their crystal lattice. These defects in turn depend on the method of oxide preparation, i.e., on the oxide history. This fact has been neglected, which is the reason for the substantial differences in the literature data for the specific conductivity of lead oxides."

[phrunt]

The DD is still very sensitive to the small targets, JW has found very small nuggets with reasonable depth with his DD and we were both surprised with the first nugget he ever found with it, it was very small, I'd guess around 0.03X of a gram.  He's forced to use it at the moment with his 11" away for warranty still and he's still doing well, and now he's got a very stable detector.    The last place we went to he knew I'd have difficulties with my GPX and would struggle with it as he'd had his there, while the power lines are not all that close they're big transmission lines and about 500 meters away I'd guess.  His GPX with DD was nice and stable, mine with the 11" was a nightmare where I thought I'd wear a hole through my noise cancel button as I struggle with unstable detectors, I'm just not good with them.  Next time I'll be using the GPZ which isn't bothered at all even right up near the lines, it's the general area the GPZ/8" coil found me the 4.1 gram nugget a couple of weeks ago, how that lasted there that long is a mystery.

[Jonathan Porter]

Pic of some Victorian gold found by a local using the proto NF 12x7 (7x12) Xceed coil.  About 30 hours detecting time over highly mineralised areas around Bendigo. I don't know if my poor knees could handle all that up-and-down up-and-down!! ?