15 posts in this topic
I've been running Steve' s insanely hot settings non-stop for the past month. I got my first ferrite very recently and have done daily start-up ground balancing, but keep it under the 10 second rule per JP. My perception is the detector takes a few hrs to settle in. At start-up in the morning she's pretty jittery but settles down after some run time. Today I got into a field of strewn volcanics and it was a mess. Those hot settings really light up the volcanics and my only solution was to remove self from affected area. I ran into a guy running a GPX 4800 and he had also surrendered to the overload from the same volcanics. Conversely, I covered some nearby shallow gullies and tiny nuggets were lit up like surface trash. I got 7 nuggets that totaled 2.8 grams and everyone of them sounded off like a booming piece of trash. The deepest target I dug was maybe 8 inches but sounded like bullet frag on the surface.
Today I chased one seam of red clay for a good long while, but when I switched to "difficult" it disappeared while still running a Sensitivity of 20.
Granted, I'm running some fairly quiet ground in SW AZ, so I have the advantage of letting the detector settle down before it drives me crazy with its antics. I also have the advantage of detecting 3 or 4 hrs a day for at least 5 days a week, so we are mutually getting used to each other.
I don't think you can go out for a weekend in variable ground and expect these settings to work for you. Your hearing and sanity will give out long before the detector settles in and your brain settles in to the nuances of this kind of detecting. I was detecting with a fellow 7K user a couple weeks ago and he was running Sens 10 and still finding sub-gram nuggets and covering twice the ground.
It's working for me so I'm sticking with it. As Nevada Chris says "your mileage may vary".
Is there anyone out there who is willing to explain a little more in depth about the Sensitivity setting in the GPZ7000 and how works in relation to the other settings?
Or perhaps point me to an existing discussion?
I don’t feel I know enough to use it correctly and I know it's obviously important.
Thank you in advance.
By Reno Chris
So I was out in the goldfields of California yesterday with Steve Herschbach and another friend who is a detector dealer. We did some quick tests comparing the 5000 and the GPZ on mossy, wiry gold that we had found previously. These were pieces from both Nevada and California.
The smaller of the two nuggets shown in the attached photo weighs 3 grams and with an 11 inch mono set on maximum gain of 20, it was totally invisible to the 5000 - even when it was touching the coil. The detector made no response whatsoever. The GPZ on the other hand could see it at about 10 inches, and it was dug from a pounded patch that has seen many GPX detectors (including mine) at a depth of about 6 inches. The GPZ was set for difficult soil at only 12 sensitivity. So what is the performance improvement over the 5000 when one detector is blind to the piece and the other sees it at 10 inches? Mathematically speaking, it is an infinite improvement - a whole lot more than 40%.
The larger of the two pieces pictured in this post weighs 18 grams and the 5000 could see it to a maximum of about 10 inches. The GPZ could see it at 20 inches, and it was dug with the GPZ at about 18 inches. Going from 10 inches to 20 inches is a 100% improvement - double the depth of detection and also a lot more than 40%.
We also tested some specimen gold Steve had with similar results - the 5000 could not see the smaller specimens of a few grams size.
Of course we all know that the 5000 performs very well with more solid nuggets and specimens. I have found lots of gold with my 5000, it is an excellent detector.
However, the GPZ is a gigantic improvement over the 5000 when it comes to mossy, wiry, prickly, specimen and other similar forms of gold.
Some may say there is not much of this type of gold out there. I would say in response, if most of us are using detectors that perform poorly on that type of gold, how does the fact that we don't find much prove that it doesn't exist? Truth is that there is loads of specimen gold out there and I think the GPZ will be finding a lot of it in the coming weeks and months.
Geologically, many of the places where the nugget gold is truly deep are locations where the patch is sitting as a residual over a vein, and having a detector optimized for specimen gold would make very good sense.
Some hard rock deposits tend to produce this type of gold. Smart prospectors with GPZ detectors will be using this knowledge to their best advantage.
For me, I have been doing research to find places which produce this type of gold and I intend to be using the coming months to leverage this performance increase to the greatest extent.
By Nevada Brian
Just recently we were detecting (all experienced detectorist) in the grasslands of California, with two GPZ's, one had the stock 14" coil and the other had the 19" coil and two GPX's one had the 17x13 Evo and the other had the Minelab 12x15. Towards the end of the day, we decided to perform a test. We buried about a 9mm slug 14" deep. I went over the target with my GPZ, HY, Normal, Sen 15, Smoothing Off, and barely heard the target. Same settings with the 19" but much better results. Heard the target about three inches above the ground. Next, the GPX with the Evo coil in Sharp, General, don't remember the gain but a smooth threshold with the gold screamer, and no signal. The next detector is the one that is really giving me heart burn, the GPX with the 12x15 commander in Sensitive Extra, General, don't remember the gain but a smooth threshold with the stock battery. It gave an obvious signal about 5 inches above the ground. I could not believe how loud of a target response this stock GPX gave.
After hearing the results from the GPX, I increased my Sensitiviy to 20, but there was too much ground noise to hear a target. I also tried different ground and gold modes with the GPZ, but nothing compared to that GPX. I wish we had more time to really investigate, but we were all tired, and the sun had already set behind the mountain.
Is this just one of those scenarios that we must except and move on, or is there some credibility here???
Has anyone done similar tests or can give some suggestions?
Still scratching my head,
Hi guys, Mrs JW & I had spent most of Thursday doing some landscaping out the front of our place. We went down to the Shotover River & got some big slabs of schist for some path way stepping stones & did some tussock grass plantings. We had finished by about 3pm. Mrs JW said, "Do you want to go to ........ & do some detecting?" I hadnt been there for about 18 months due to not being able to get any more gold out of there so I sort of umed & arred....not sounding too keen on it. I was a bit knacked from wrestling with the slabs of schist & digging them in to place. "You havnt tried the Zed there have you?" No I havnt I said.....still not too keen. "I just want to get out of here & it is a nice place to be." she said. I couldnt argue with that so off we went.
The last time I had been here so had someone else before me & had left big un filled holes. I was really pist off with that & the holes were still there. I pointed them out to Mrs JW. Oh...they are big she said. Not holding my breath I rigged up & got in to it. This area has had all the overburden ground sluiced off from the oldtimers right down to schist bed rock. I had done well here back with the 3000, 4500, GMT & GB2 until I was getting no more. Not 1 minute in to it & I backed up on what I thought was a very very faint signal on top of the schist bed rock. Well I'll be buggered. It was repetitive with each sweep. All be it ever so faint. Probably a lead pellet. Bit of a scrape of the top & it improved but was still in the schist. Down now in to the schist & getting deeper & better. Down in to a small deeper crevice in the schist.
How small is that. You can just see it on the coil in the above pic.
What gobsmacked me was the depth for such a small piece.
A few minutes later. Another very very faint signal.
Exactly the same scenario. Down in to a deeper schist crevice
Then another faint signal & down in to the schist wash. Wasnt in a crevice or schist bed rock but down a wee bit.
Still bloody small.
Then it dawned on me that I hadnt got one crap target. Just gold gold gold. One after the other. Shows how heavily this ground has been detected. No crap signals left.
I then wondered over to one of the unfilled dig holes & waved the coil in to it & around the outside. What was that?? A signal. I backed up & on the top outside edge of the hole was a definite signal.
I scraped away at it & it was still there
Gold it was. Another very small bit. You may just make it out beside the G on the coil.
If not....here you go...
I walked back towards where Mrs JW was sitting waving the coil as I went ready to pack up & head off when I saw another shallow scrape from some one else in to the up on edge schist bed rock. Ha....they must have got a wee thin bit stuck in the on edge folds of schist. And as I do..... I waved the coil over there scrape. Well I'll be darned....a faint signal. Must me another thin piece jambed in there some where. They cant have re scanned there dig after recovering their target before moving on. BIG mistake. Well to cut a long dig short. It wasnt a shallow bit & I ended up having to smash in to the solid schist rock. No way I thought. Felt the pain for my pick....not to mention me trying to dig the bugger. Mrs JW was pissing herself with all the grunting & groaning coming from me. You may have to come back for it, she said. No way I said. This is going to be gold & I aint leaving it here.
It still wasnt out at this stage. Look at all that smashed out schist. Oh...my poor pick Oh well....back in to it
Look at the depth in to that soild schist & Mrs JW having a good laugh....at my exspense
Finally it was out
Ended up with 6 bits for .88 of a gram
Now I realised that on my very first day with the Zed that there was something very special about this detector. For me it was the depth it was getting small gold at. I realized that any bigger gold would take care of its self. I cant fathom why there was so much bagging of this detector from so many when it first came out. I can only put it down to people being so stuck in their detecting habbit ways with the PI's. The Zed is a different beast & needs to be used as such. I guess I am lucky that & a bit of water has flowed under the bridge since its release & learning curves been learned & I have benefited from that. One thing that really stands out for me is from what JP said. Be conservative with your settings. When I first used it I had the threshold up a bit & the sensitivity to the point where it was running a little bit ratty. Just like I did with the 3000 & 4500. Getting that top end max out of it. The thing with the Zed is the faintest of signals still lift with the thing toned down a bit & so getting rid of that Zed warble, especially with JP's B&Z Booster system. The swing arm helps immensely too. I wouldnt be with out it to get that total coil swing control. Even & parallel to the ground.
Mrs JW & I did go out yesterday for a detect with a bit of success. We are in for a few crap weather days so this will be my last report for 2016. Will do yesterdays outing in the new Year. Cheers guys.
All the best to you all for 2017
Happy New Year