Aftermarket for GPZ

Another couple of what looks like well designed coils Dave. Interesting to see how that smaller 10x9 inch performs.

Cheers Kon.

Heard one of the local coil manufacturers is being given the chip to make coils here?.?

Alan WA wrote:

Heard one of the local coil manufacturers is being given the chip to make coils here?.?

That'll be interesting!

cheers dave

Retested the 22"x21" coil on the GPZ7000 today, same hole same lead sinker but I flattened it out a bit to get more surface area, and that made a big difference, I figured most gold nuggets were not totally round so that's the reason for a more flattened target.

Also the 3 new after market coils I received this week were also tested over the exact same target as well.

22"x21" retested in the video I called it a 22x12 which is wrong, it is a 22x21 in fact.


cheers dave

These videos are the 3 aftermarket Russian coils for the GPZ7000 that we tested today, same 58 gram lead target as last week but flattened out a bit for more surface area.

All coils were tested using sensitivity 13, and then timings were switched between difficult and normal, and between High yield, General and Extra deep.

This is the 10"x9" going through the settings


This is the 16"x15" solid going through the settings


This is the 16"x15" open spoke coil going through the settings


cheers dave

By flattening out that 58 gram lead ball, giving it more surface area, clearly showed a jump in depth Dave. I can bet it will raise some eyebrows when testing the 22X21 ("Goliath") over that same buried target Thanks for the update.

Cheers Kon.

More coils arrived from Russia from the manufacture for me to test this coming weekend.

An 18" round, for the 7000, the same as the coil Stan and I tested in WA a few months ago, it was a great coil, this one should be the same.

Also a 15"x14" coil for the 7000 it looks great.

And a 15"x14" coil  for the GPX4500/5000 to give a test.  The difference in weight between the 15x14 GPZ and GPX coil is significant, (375 grams), the 15x14 GPZ coil weight without the lower shaft is 1350 grams, and the 15x14 GPX coil weight without the lower shaft is 975 grams.  The GPZ coil has a few ml higher profile. All coils have skid plates attached, and skid plates are available for all there aftermarket coils.

Aftermarket 18" round for GPZ7000


Aftermarket 15"x14" for GPZ7000


And the 15"x14" for GPX 4500/5000


cheers dave

I like the looks of that 18 inch round (solid filled) coil Dave. It would suit Victorian soil conditions to a tee. Looking forward to the outcome of your test results. BTW, all variety shape/size coils, look good & well made. Full credit to the manufacturers for sticking it out & not giving up on perfecting them. I can only wish them a successful outcome.

Cheers Kon.

Both the 18" and the 15x14 coils ran very well, in HY dif and all other settings worked well, obviously the normal soil settings on the smaller coils are prone to getting more ground feedback than when running in "difficult" high yield or general or extra deep, and yes you do get some extra depth in normal soil timings, but you have to choose which ground to use that setting on.

Just detecting around a bit after some testing with the 15"x14" and came across a target that sounded very nice, you know the ones, it could just as easily been an ounce nugget at depth as what turned out to be a small brass buckle of some kind at 400mm or 16"

Settings were Difficult General.  Sensitivity 13 target volume 13, threshold 27, target pitch 38, semi auto ground balance,  using a B&Z booster with dual speakers

Here is the video of the undisturbed undug target.


cheers dave

Dave, the 2 bigger coils that you are testing, have you ran them on small sub gram targets yet?  Just asking as many here like myself would like to know comparison with the 14" minelab coil. A lot of areas like tibuburra  have small gold and the 7000 does well for us and friends as it picks up the smalls and covers ground at the same time.  If these new coils will pick up the same sub grammers like the current 14",  and possibly go deeper then these coils will be a real step up. Yes bigger coils are also a good new ground coil and cover ground quick but to have the extra benifits would be fantastic.  Thanks TG

The 18" coil that Stan and I tested in WA picked up sub gram nuggets no worries, but on the whole I think if your using big coils on deep ground then it's not sub grammers your after.

cheers dave

Meet up with Kon61gold today at Maryborough VIC for some testing of the Russian aftermarket coils and compare with the GPZ14" standard coil on the 7000. Some interesting results to say the least.

Kon may like to post the results.

cheers dave

This is a most interesting development that I shall be following.

Thanks Dave

Hearing/seeing the testing of these coils on youtube is one thing, testing them yourself is another. Firstly having used both the GPZ 19 inch/14 inch coils I can honestly say that the aftermarket coils, look very well made & are far lighter in weight as compared to the standard 14x13 inch GPZ coil of similar insize, nor do they have the bulkiness associated with the GPZ coils. The coils were tested for ground balance stability, ground touch sensitivity, as well as any spurious unwanted ground signals when bumped into any obstacle, of which all 4 coils tested, were found to be quite stable over your average to reasonably high, mineralized ground conditions, with better all-round coil peripheral sensitivity, as compared to the standard 14x13 inch GPZ coil.  My main purpose today was to see how the largest aftermarket coil available at the time of this test (21x22 inch) & the smaller (10x9 inch) would perform over gold of 11.7 grams in weight & a tiny bit of colour 0.08gm in weight consecutively, as compared to the original standard 14x13 inch GPZ coil.
The purpose of these air tests were simply to see the difference in depth advantage, between coils using identical settings/timings in an air test. They in no way are meant to represent actual gold, found buried in undisturbed soil/ground conditions.  The settings/timings used in this case were General, Difficult & Gain on 13. All four coils were found to run smooth/stable over the mineralized ground/soil conditions we tested them on. The eye opener was the small 10x9 aftermarket coils sensitivity to tiny gold, which could clearly pick up the 0.08gm bit of gold, at a measured 3 inches high (which was to be somewhat expected being such a small coil), as compared to 1 inch depth or height with the 14x13 GPZ coil & 12 inches deep, over the flatter 11.7 gram gold nugget (13 inches deep with the 13x14 inch GPZ coil). Next was the testing of the solid 18 inch after market coil, which went 17 inches high/deep over the 11.7gm gold nugget, as compared to 13 inches high/deep for the 14x13 GPZ coil. The 16x12 inch aftermarket elliptical coil, was more than on par with the 14x13 gpz coil, with in my opinion, showing slightly better/louder/clearer signal response to all targets in general, than the 14x13 inch GPZ coil. The largest coil (21x22 inch) gave a clear signal over the 11.7 grammer at a measured 18 inches high/deep. Keep in mind these tests were performed to actual ground working conditions, with more ground signal response left to spare & the settings used, were just a few of the many type/combinations that can be used, where ground permitting. Shame we didn't have a 19 inch GPZ coil at the time of testing to compare them to, but to say I wasn't left happy with what I saw, would be an understatement.
One other thing I should mention here is that I am in no way paid for this write up, nor associated/affiliated with the manufacturer of these aftermarket coils, in any way, shape or form, just happy to put down an unbiased report to what I experienced during the comparison testing of some of these after market GPZ 7000 coils.

Cheers Kon.

Reg Wilson wrote:This is a most interesting development that I shall be following.

Thanks Reg

G'day Kon

It was a pleasure to meet you yesterday and demo the aftermarket coils, and to run the demo the way of your choosing.

Earlier in the day we ran all the coils on the Coiltec test bed and videos of the results which I will stitch together into a single video for easier viewing (8 videos in all) and will post them up when I get home.

cheers dave

Good on ya Dave.  I'm sure there'll be more than one person on here, interested in seeing the final test results of the aftermarket GPZ coils tested, on/over Victorian gold ground soil conditions, in the latest videos you put up.

Cheers Kon.

Finished testing coils in VIC and heading home, all coils performed very well, some small gold to show as well.  rain every day, so testing conditions for people as well as coils.

0.8 gram at 6" deep in hot ground, with wet and dry variable patches


15"x14" coil with the 0.8 gram bit of gold


And the hole it came from. settings were Difficult/General and sensitivity 13


cheers dave

Some videos of the aftermarket coils on the GPZ7000 at the Coiltek test site in Maryborough VIC, conditions were wet ground and some sprinkles of rain.

All tests were done the same day and spread over about an hour.

Settings for the tests for the aftermarket coils were as follows, Difficult/General and Sensitivity 13,Threshold 27, with Audio Smoothing High, Ground Soothing Off, Semi-Auto Tracking.

Testing Aftermarket coils in VIC for GPZ7000
https://youtu.be/IhNCC_OPjVU?list=PLf7iPqCW_DPrWTnJ20OnCrMh7-N9ZnGaC

cheers dave

The target that Graham could'nt remember is a 5oz longish snapper sinker @ 50cm deep,

Hermann wrote:The target that Graham could'nt remember is a 5oz longish snapper sinker @ 50cm deep,

Thanks Hermann, and it was great to catch up with you again while in VIC

cheers dave

Thank you Dave for all the fine work you're doing to share your findings on these prototypes.
Testing like this can be an onerous task to say the least, and posting the results time consuming, and costly as this time could be spent hunting yellow.

Thanks also to you Kon for sharing your thoughts on these, we all know your disappointments in this area as regards the Karken, maybe the Russians will cracken the depth boundary for us!

There's one thing for sure, the GPZ8000 coils will have the security chip embedded in ferrite within the coils to stop this sort of thing, so hang on to your 7000 if you want more coil selection.

Thanks Alchemist.

Alas, I wish not to talk about the disappointments of the past, but look forward to (as others on here do as well) a brighter future. After seeing for myself, what these new aftermarket coils are capable of, In my personal opinion & as far as I'm concerned, the depth boundary for the GPZ has been elevated/taken to new heights.
Keep in mind, all my past as well as present testing of any new detector/coil combo, has been done with real gold nuggets at hand. Now regardless of timings/settings used, or testing undertaken during an air test, on/over a nugget buried in dug up disturbed ground, seeing a "clear cut" depth advantage by the 18 inch round, over that of the standard 14x13 GPZ coil, using identical settings/timings, left me a little speechless. I have come to the conclusion that finally, the 2 foot mark on a 2oz  slug of gold, found buried in undisturbed, mild, to reasonably high mineralized ground conditions, has finally come to reality/fruition. Only time will tell, on how well built/durable these new aftermarket coils are, by putting them through their paces, going over real gold ground conditions, in search of that elusive yellow mellow  

Cheers Kon.

I like everyone else is keeping a close watch on the testing of these coils.
Long story short, I dont see how in mild to mod hot ground that anyone with the stock coil could miss a 0.8g@6" in wet ground I just don't get it???

Dave what has been in weight using these coils your largest find? I don't recall anything of size, and you have been testing them for a long time now, surely something larger than 2 gr's has come your way ok 8gr's?

As for hang onto your 7000, the next set of coils could well be like the 800 where halve the circuit (or some part will be part of the coil) to make it all work

I/we still haven't seen anything that is of size with these aftermarket coils, sorry that's just the way I see it

Marty

I saw how the 10x9 coil worked. The smallest targets detected were weighing 0.1-0.2 g. And they found them without any problems. The soil was not heavy.

Ok, we took the 18" coil out about a week ago to jupitor creek near adelaide to test on a test patch against the 14" and 19" minelab coil.
We were with a coulpe others including a well known operator who may want to make his own comments.
I was very happy with the weight of coil and it seemed well balanced. Briefly i believe that on this test bed it showed improvement on 14" and minor improvement on some targets against the 19". The targets were various sizes and depths which some  proved to be testing all coils. My memory is not good due to chemo drugs i am on but the new 18" coil had dificulty balancing out the ferrite in one of the setting, think it was general mode. Otherwise it balanced well.
On air test the 18" showed an impressive improvement. I hope that will equate to true field use.
All testing was done in factory settings.
After this i went for a walk to try it out, jupitor creek is really only detectable with small coils as there is thick growth.
I dug shot gun pettets and a short 22 casing which i think any detector would have found.
Thenwent on a mullock heap where there was various old dig holes and got signal which was approx 7" deep. This was a very small iron fragment which i think i would not have got with the 14".  I also got a just signal which was broard and sounded much like the deepest target signal in test patch. I started to dig but after a few minutes gave up as health wise it beat me. Will be going back when can to unearth this target and is cooler.
We have another area to run this coil over also where gold has been got near adelaide using all known detectors and coils and if we can pull gold from there then coil will certainly shine. Gold there is deeper just out of reach with current technology. 
I like the feel of this coil and weight wise and balance i love it already.
I other people may comment further with there thoughts on what they saw and think.

Thanks for your report Wally (Travelergold), I know the weather has be hot hot and more hot, so getting out to even test the coil is a challenge on its own, good luck in the weeks ahead as you and others get some time in the field with the new coils.

cheers dave

Patience my fellow prospectors. A few more days/hrs testing/detecting is all I require, before putting up a full write up, on the new 10x9 inch aftermarket GPZ coils performance. Things would have been a lot faster if it weren't for this horrid hot spell Inland Victoria is currently undergoing. It just saps the life out of ya.

Cheers Kon.

Kon, i thought it was always cooler in vic, yes i am over anything over 25 deg. Health and chemo daily is buggering me up big time.
Does not matter how long you put up with it, it just drains your body. 
Cant wait to see what you think.  Just hanging out to see the cooler weather here to get back for real test.

You must be talking about the constantly changing weather conditions of Melbourne Travelergold. The temperature here in Bendigo Vic at the moment is sitting on a steady 38 degrees. I'm sure there are many on here & from elsewhere, eagerly awaiting to here some form of news on these new make of GPZ aftermarket coils called "X Coils". One more locality to go, consisting of shallow gold workings & near by power lines, in order to test the small coils EMI resistance/characteristics & the report is sure to follow.

Cheers Kon.