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Mada

2nd Machine And Frequencies

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Hi all

If I'm using a vlf/lf that is over 40khz, is there any benefit to getting a 2nd machine that runs under 40 kHz when prospecting? Assume PI is not possible at the moment. Does a sub 40 bring anything special to the table? I'm a beginner so just curious

Thanks

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You didn't specify what detector you're using above 40khz, if it's the GB2 at 71khz then yes, a lower frequency machine will handle ground better and will also go deeper.

This chart from the Gold Monster may help you

minelab-gold-monster-frequency-range-compared.jpg

 

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Hi Phrunt

You're right, I should have explained myself better. I currently have a Sea Hunter Mk2 I use at the beach and snorkeling. My partner has the GB2 to go prospecting. I'm looking at getting a prospecting machine and was wondering whether I should look at a lower frequency machine such as the xterra705, Equinox etc? Is the GM1000 sufficiently different to the GB2......? I'm working on the assumption that if we're out together a different machine may help fill the gaps.

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Yes, the GM1000 would be a wise choice if your partner already has a GB2 although a Equinox 800 paired with the 6" coil will give basically the same results as the GM and then you have an excellent multi purpose waterproof detector you can use for other things should you wish to, including the beach which sounds like something you use the Sea Hunter for.

The Equinox and GM will do better on small gold than the X-Terra.

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Thanks for that Phrunt. I think I read on this forum that anything over the 30-40 khz were pretty similiar that's why I was thinking maybe something like the xterra 705 gold or something similar under 20 khz

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I have the Gold Bug Pro at 19khz, I'd never pick to use it over the GM1000 or Equinox for prospecting.  The good thing about the Equinox is if you find a reason you want to run 20khz,  you can... it's very versatile.

 

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Personally, even though I really liked the X-Terra Gold 705, it cannot approach the versatility or excellence of the Equinox 800.

Jeff

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Higher frequencies will produce the best air tests on all gold targets. However, higher frequencies also react more to the ground and hot rocks. Lower frequencies lose some "depth" in air tests, in particular as regards the smaller targets. However, lower frequencies are also less reactive to the ground and to hot rocks. This means that lower frequencies can be of benefit for a VLF detector in severe ground and hot rocks. You basically give up some theoretical gold sensitivity in return for less reactivity to the ground and the hot rocks. If the ground is so bad it makes the higher sensitivity machine unusable this is a decent trade. You will still do ok on the larger gold, leading to some misunderstanding that lower frequencies are better on large nuggets. Well, sort of, but generally only in very bad ground. Keep in mind most gold is small so going low frequency just to chase large gold is not the best strategy. If that is the idea, get a PI detector. I suppose if you were on a tight budget trying to hunt large gold in very bad ground a low frequency VLF would be a possibility, but a White's TDI SL is an affordable and better PI option for such situations. It’s not a black and white answer type thing though. I could see a lower frequency VLF being the better option over a PI in a high mineral/high trash area.

You did not mention but it seems like you may be wanting the detector for more than just gold nugget detecting. If that is so, general purpose lower frequencies like 12 -19 kHz are better options. If you are in a park you do not want extreme sensitivity to all the zillions of bits of tiny trash. General purpose machines are purposefully "less hot" for that very reason. If you actually want a general purpose machine that is a whole different can of worms I will ignore for the time being in favor of the original question. I will point out that your mention of the Equinox as a "lower frequency" machine is not entirely accurate since the 800 runs up to 40 kHz while also offering low frequency options.

Both the Minelab Gold Monster at 45 kHz and the new White's Goldmaster 24K at 48 kHz target that frequency range for giving the best balance of performance of the type of gold most U.S. prospectors are likely to encounter in quantity, especially now that most areas have been pounded with PI detectors. I wish I could tell you a low frequency VLF is a great option but it’s this basic truth we all have to deal with - the big nuggets get found first and PI blows VLF away in that regard.

The Gold Bug 2 at 71 kHz is the reigning master of tiny gold, but pays the price in poor penetration in bad ground. The real benefit however is both these newer machines are employing the very latest in digitally processed ground balancing that allows them to better work in ground where such high gain machines would previously have had more difficulty. This does not mean they equal PI detectors in that regard, as some people incorrectly assume. It's just that they do as good as machines in their class can do handling bad ground.

Both the Minelab Gold Monster and White's Goldmaster 24K have performance close enough that I consider them roughly equivalent and I am happy to use either. The choice should be made on the scales of simplicity versus adjustability. The Monster is made with as few controls and adjustments as is possible, whereas the 24K has more control options than most nugget detectors. The Monster may seem constraining to some and the 24K too complicated to others, so I recommend looking at the owners manuals for both at the links above when making the decision between them.

White's Goldmaster 24K Advanced Ground Tracking Explained

 

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Mada, you asked some very good questions for a beginner. Let me offer a few thoughts regarding IN-GROUND performance. First off, there is NOT as much performance difference between frequencies as some advertising would imply. A properly tuned GBII (71khz) in MILD ground can find flakes of gold as small as 1/20 grain. But in MODERATE ground you will rarely find anything smaller than 1/10th grain, and then only at seriously reduced depth. My Goldmaster 24k (48 khz) can find 1/15th grainers in moderate ground, and it SCREAMS over 1/10th grainers. When it comes to actually finding gold, to be honest about it, there really is NOT much differance between 1/20th or  1/15th grainers or 1/10th grainers. Furthermore, the White's MXT (14 khz) with the 950 coil can find 1/4 grainers in moderate soil. To recap:  71 khz: 1/20 grain; 48 khz: 1/15th grain; 14 khz: 1/4 grain. It really would be splitting hairs at this point. But, there are other factors which far overshadow operating frequency, and these include the size and type of searchcoil, decibel output of headphones, operator expertise, sweep speed, etc. MY two-machine line-up: Goldmaster 24k and TDI-SL. Hope this helps; HH Jim

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