Jump to content
Steve Herschbach

Target ID / VDI Numbers For Gold Nuggets And Gold Jewelry

Recommended Posts

On ‎4‎/‎25‎/‎2017 at 11:05 PM, Steve Herschbach said:

Here is the final thought for the night. Back when Fisher did the CZ series of detectors they did lots of ring testing. They tested 255 rings for the CZ-70 and came up with some interesting percentages. I have seen these percentages reflected in the field.

2% of the rings were in the copper penny, dime, quarter range.

4% of the rings were in the zinc penny/screw cap range

49% of the rings were in the "pull tab" range above U.S. nickel

10% of the rings were in the nickel range

36% of the rings were in the foil range below nickel

0% of the rings were in the iron range

Now look at my simplified X-Terra VDI chart in the post immediately above. What we are seeing is the difference between women's rings and men's rings. Women's rings tend to be small high quality rings, and cluster in the foil range. They are the rings most likely to have stones and be of high value. Men's rings are significantly larger and heavier, and fall into the area above U.S. nickel. There is a weak spot or gap between women's and men's rings in the nickel range. This is of course a gross generality but I have found it to be true in my own detecting. You can use this to good effect when looking at an area and deciding what might be found there. Is the area more likely to hold men's rings and women's rings? The football field will more likely have men's rings. The shallow childs wading area or tot lot will lean women's rings. I do a lot of heavy surf detecting, and nearly all my finds are men's rings.

I have mentioned the Fisher CZ detectors. Rumor has it that CZ stood for "Coin Zapper". The CZ detector are unique in having a shuffled discrimination scale that puts nickels up high with the other coins. Little attention is paid to the fact they also lumped the bulk of the ring zones together. In addition to visual target identification, the CZ  has 3-tone, audio target ID. A low tone is for iron, a medium tone Is for pull tabs and foil and a high tone is for coins. A fourth tone, which sounds like a telephone, alerts you to large, shallow targets that are usually (but not always!) trash.

Basically with a CZ, low tone is iron, medium tone the ring range, and high tone the coin range. The newest model, the CZ-3D adds a fourth tone to the scheme designed to capture old coins in the zinc penny range, but for jewelry detecting the original CZ scheme is pretty simple and ingenious.

The good news is with newer detectors that have custom tone id ranges you can duplicate this setup yourself. Fisher also offers this modified tone scheme in the F75 models. The main thing is to be aware, no matter what detector you are using, or where the possible ring "hot spots" are on the VDI scale depending on where you are hunting.

From Fisher CZ-70 Pro Owners Manual, page 24 (tones added):

fisher-cz-7a-pro-ring-percentages-chart.jpg

 

This is fascinating stuff.  Interestingly enough, I dug 6 gold rings last year.  A solitaire, 3 bands, and 2 child's rings.  The solitaire fell in the nickel range, the 3 bands were all in the zinc penny range, and the two child's rings were down in foil range (both tot lot finds).   Based on the percentages above...aside from the "dig it all" tot lot finds.... I walked over 25 gold rings.  And I believe those statistics.  

It is a lot of work to commit to the mid tones... but it is obvious that is where the yellow is.  

Tim.

  • Like 2

Share this post


Link to post
Share on other sites

I always try and keep the VDi's that could be jewelry active because if you don't dig it you don't find it. 

I dig a lot of foil and it's surprising how small of a piece of foil I detect and that only tells me if it were jewelry I would find it. I most often find jewelry in tot lots and sidelines of ball fields.

  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By phrunt
      Disclaimer: I've only really been interested in Gold hunting so I'm pretty clueless in using my Nox for jewellery hunting.
      This might be a challenging one, a farmer I knows wife lost her wedding ring in a paddock and didn't realise,  Later the same day they run a plough or some sort of farming gadget over the paddock as they planted it out with grass seed so the ring is likely buried.  They're pretty certain it was lost in this paddock.
      I have been recruited to try find this ring, it's 24k gold with about 20 diamonds on it.  The guy originally gave me the wrong description of the ring, probably his ex-wife's ring he described as he said it had 1 diamond and sapphires 😄
      The paddock is really junk filled, I went and swung my detector over it yesterday morning before skiing and there was iron I assume setting the detector off everywhere in all metal mode.
      I know the VDI numbers are extremely useful for coin hunting but will they help for finding this ring, I really don't want to have to dig everything! Is there a range I should be targeting? I assume Field 1 will be the best mode or maybe Park 1 seeing there is a lot of junk?
      Small gold when prospecting always comes up under 10 on the VDI's, I am guessing a ring will come up higher? 
      Would the Equinox be my best choice or would I be better off using my T2 with Mars Tiger 10x13" or 15" round Stock T2 coil for more ground coverage? I also have a Garrett Euroace with Nel Tornado 12x13" I could use if that would be best.  That's the biggest coils I own.
      I have a GPX 4500 with a 15x12 DD Commander I could use but I don't want to dig lots of junk and I was hoping VDI's would be useful.
      I told them I'd do the hunt for nothing when they tried to pay me as it's a bit of fun for me anyway but they said they can't allow that and they'd give me a few sheep for my freezer for my efforts even if I don't find it but I'm sure if I find it they'll force me to take some sort of payment, I will try refuse as I really don't want it but it will be difficult to not take it when they're forcing it....
      The paddock is about 3 hectares!!!!!  Just over 7 acres so I really have a job ahead of me.  The soil is extremely mild but it seems to have its share of junk.  I assume rusty old nails and tractor bits and mower blades whatever else over the years.
      Any help appreciated.
    • By Steve Herschbach
      Our cup runneth over!
      Just a few years ago the market for "over 30 kHz nugget detectors" was quite limited. For a long time there were only a few options:
      Fisher Gold Bug 2 (71 kHz) $764 with one coil
      Minelab Eureka Gold (6.4, 20, & 60 kHz) Discontinued $1049 when new with one coil
      White's GMZ (50 kHz) Discontinued $499 when new with one coil
      White's GMT (48 khz) $729 with one coil
      Things were that way for over a decade. Then in 2015 Makro introduced the Gold Racer (56 kHz) $599 with one coil. Sister company Nokta released the AU Gold Finder (56 kHz) $799 with two coils
      Then in 2017 we see the Minelab Gold Monster 1000 (45 khz) at $799 with two coils. And although not a dedicated nugget detector, the Deus high frequency coil options (up to 80 kHz) were also released, $1520 for complete detector with one HF coil.
      Now in 2018 we get another general purpose machine, the Equinox 800, that can hit 40 khz, $899 with one coil. And just announced...
      the Makro Gold Kruzer (61 kHz) $749 with two coils and
      the White's Goldmaster 24K (48 khz) $749 with two coils
      These last two announcements have made barely a ripple in the prospecting world, or at least going by other forums that seems to be the case. There are various reason for that (forums not being prospecting oriented or being Minelab centric) but still the lack of buzz is interesting. I do believe people are both burned out by all the new introductions and that the market is saturated with high frequency models. Leaving out the general purpose machines to sum up the current options it looks like the current "sweet spot" for pricing is a high frequency model at $749 with two coils.
      Makro Gold Racer 56 kHz - $599 one coil
      White's Goldmaster 24K 48 kHz - $649 one coil
      White's GMT 48 khz - $729 one coil
      White's Goldmaster 24K 48 kHz - $749 two coils
      Makro Gold Kruzer 61 kHz - $749 two coils
      Fisher Gold Bug 2 71 kHz - $764 one coil
      Minelab Gold Monster 1000 45 kHz - $799 two coils
      Nokta AU Gold Finder 56 kHz - $799 two coils
      High Frequency Gold Nugget Detector Roundup

    • By MikeM
      Hi, I am looking to purchase a gold finding metal detector that can handle mineralized soil well, but also locates smaller gold.   I live in southern Nevada and it seems that the more I read, the more confused I am getting.  I guess I'm looking for a detector that does well with tiny and larger gold.  I had the Gold Bug 2 for a while and it was way too sensitive for me and not rain-proof.  The Makro Gold Kruzer,  The Gold Monster and others on that level are all within my price range, so I am having trouble making a decision.  I understand that the right detector for someone may not be the right detector for someone else, but I do believe the right input is valuable.   I haven't seen any head to head videos using the Gold Kruzer yet (still too new) but it looks promising so far.  The reviews of these detectors are great, but nothing beats real world testing under various conditions and soil types.   I am not one for air testing due to it's controlled nature,  so the confusion grows.   I know many of these detectors can locate tiny gold due to their higher kHz, but there is a trade off.   I appreciate any suggestions.  Thank you, Mike  
    • By phrunt
      I don't know if I'm right on this but I've found my Teknetics T2 to be a good guide to mineralisation at an area, I use its Fe3O4 meter as a guide.
       Would I be right in using that as a guide?
    • By Steve Herschbach
      I have used many metal detectors over the years, and right now I have to say that the new Makro Racer 2 has perhaps the easiest to understand, best laid out, most practical display and menu system I have ever seen in a top end detector. Now, you can sure say you hunt by ear and do not need a screen and I get that, but if we are going to put a screen on a detector, then let's do it right.
      Simple detectors with few functions are easy to make screens for - there is not much you need. But even then just the basics are often wrong. Machines that feature target id numbers, what is the thing you will most look at on screen? The target id numbers! Yet these are often way too small or off to the side as if an afterthought.
      The Makro Racer 2 id numbers are huge, much larger than on the original Racer and Gold Racer, which are already good sized. The number 88 display in the diagram above is fully 1.5" x 1.5" in size in real life. Other machines have some pretty big numbers but I think this sets a record as I can't think of any machine with larger id numbers on screen though some are close.

      Makro Racer 2 LCD display and controls

      Makro Racer 2 screen layout

      Makro Racer 2 screen and control descriptions
      The number can be the ground balance number, target id, or depth reading. You get a text display just above the number confirming which it is. Below the numbers are three zone references, Fe, Gold/Non-FE, and Non-Fe, that are used to set tone breaks and audio for the three main zones or bins as they are sometimes called.
      Another basic feature lacking on a lot of machines - the meter backlight. With the Racer 2 you get off, intermittent, or full time backlighting, and it includes the translucent red control buttons. The control ranges between 0-5 and C1-C5. At 0 level, the keypad and display backlight are off. When set between 1-5, they light up only for a short period of time when a target is detected or while navigating the menu and then it goes off. At C1-C5 levels, the keypad and display will light up constantly. I do not know of anyone doing a better backlight.
      The right side of the meter is informational - ground phase (ground balance number), mineral % (ground magnetite content), coil warning notices, and a six segment battery meter.
      Across the top below the 0 - 99 reference sticker, is a series of 50 "bullets" each of which covers 2 target id numbers. Open bullets (which appear gray in the diagram but are invisible in real life - see top photo) indicate accepted target id numbers. Blacked out segments show what discrimination and notch setting you have programmed in a single quick glance. When a target is detected, the big number on the display will be mirrored by one or more of the bullets flashing dark.
      The four control buttons are simple as can be - up and down takes you through the left hand menu area. Right or left lets you set each function selected by going up and down. The menu is basically the entire feature list just laid out right there for you to see. You want to know what this machine can do, just look at the screen. Most other machines you have no clue without reading the owners manual or at least pushing buttons to see what functions appear.
      Some settings like the backlight are system wide for all modes. All other settings like Gain are independent in each mode, and can be saved independently in each mode. This means you can play neat tricks like setting up a couple modes with dramatically different settings and then flip back and forth easily between two modes for target checking.
      You even get to decide what mode is the default start up mode. The Racer 2 starts up in the last mode where the save function was performed. If you always want to start in Beach mode, just modify and save something in Beach mode. Next time you start the detector, you will be in Beach mode.
      It is simple. It makes sense. No cryptic abbreviations or acronyms. No sub menus. It is, in metal detector terms, a work of art. Whoever designed this should sign it so I can frame it and hang it on my wall.
    • By Steve Herschbach
      First Texas (Bounty Hunter, Fisher, Teknetics) - last new models Fisher F75+ and Teknetics T2+. Next up a new pulse induction (PI) beach detector. A new digital multifrequency to replace the Fisher CZ3D is long overdue but at this rate we will be lucky to just see the PI before the end of the year.

      Garrett - last new model the AT Max. Hard to believe the flagship GTI 2500 has been around since 1999 with no updates. Garrett so far has shown no interest in multifrequency. The most I was hoping for was a lightweight dry land version of the ATX, but so far no sign of that happening either. I doubt we will see anything else from Garrett this year but they could surprise.
      Makro - last new models the Multi Kruzer and Gold Kruzer. Makro has mastered single frequency so everyone would like to see what they can do with multifrequency or pulse induction. I expect Makro is done with new models for the year.
      Minelab - last new models Equinox 600 and 800. I have no idea what’s up next for detectors but I sure would like to see that small coil for my GPZ 7000. I really don’t expect anything new for the rest of the year besides Equinox accessories.
      Nokta - sister company to Makro. Last new detector the Nokta Impact. I actually bet on a PI under the Nokta brand rather than Makro brand simply because the Nokta housings like the new Impact housing would better contain a high power PI.
      Tesoro - Who? What?
      White’s - last new models the MX7 and TDI SL Special Edition plus the just announced Goldmaster 24K. Hopefully that new tech will eventually see the light. Right now just getting the 24K out the door is job one.
      XP - last new products the HF coils for the Deus, with X35 coils due by end of year.
×