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Steve_Herschbach
00:11:40 Sun
Aug 30 2009

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Fisher Gold Bug 2 versus White's GMT

Hi,

I've used both units extensively and still own both.

If I want to hit the smallest gold possible, I'll be using the Gold Bug 2 with a 6" coil. The GMT is close but the GB2 has the edge for small gold.

However, the GMT gets much better depth in hot ground on large nuggets than the GB2. For overall performance I think the GMT has a better balance of both small and large gold performance. I'm generally willing to pass on sub-grain gold to get better depth on larger gold. I'm not saying the GMT will not hit sub-grain gold as it will quite easily. I'm just saying the stuff I can get with the GB2 that the GMT can't is very tiny indeed.

I guess which raises the question of why I'd care to use the GB2. Well, when checking hardrock quartz samples even a flyspeck can indicate rich gold ore. And when using the detector as a replacement for a gold pan, again, even a flyspeck can tell me I might want to set up a highbanker. The GB2 excels at these uses.

They both have dramatically different iron rejection capabilities, both with pluses and minuses. The GB2 uses a iron rejection system that basically ignores iron targets. The GMT always signals iron, but indicates via a meter the probability the item may be ferrous. If the probability is high enough, you also get an audio indication.

The issue is that in many soils a very small or very deep nugget at the edge of detection depth will often signal as iron. If you have the iron disc engaged on the GB2 and pass over such a nugget, the machine will ignore it, and you'll never know anything was under the coil. So the smart way to hunt with the Gb2 is to hunt in all metal, then engage the disc to check the target. If it reads iron, knock off some soil and try again. If it still reads iron, it probably is. But in some rare cases the target that initially read as iron will now read as non-ferrous.

The problem in really trashy sites though is that it is tempting to just hunt in iron disc mode. I've done it myself. But there is the risk of passing on nuggets when you do that.

The GMT will always tell you there is a target. Its meter is honest in reflecting probability as you never get a 100% iron or 100% gold reading. The machine always tells you there is doubt. If it reads 50%, well, I'm willing to take a 50-50 chance on digging a nugget. With the GMT the thing to do on questionable targets is again remove some soil. If the iron probability increases, you are closing in on iron. If it decreases, things are looking better that it is non-ferrous. For most uses the GMT system is the superior system.

But when you get into intense hot rocks the GMT can drive you nuts. The rocks often read iron and register with the audio iron "grunt". But try listening to grunt-grunt-grunt every swing while waiting for a beep. Tiring. With the GB2 you kick it into iron disc, and most hot rocks are simply ignored leading to much quieter operation. Again, a nugget may read ferrous and be ignored. But I still find the GB2 preferable in this type of circumstance.

I not only use detectors but I'm also a multi-line dealer. I get to talk to lots of users. And ease of use is a big factor. The fact is the Gold Bug 2 must be mastered to be of use. There are lots of people that simply have trouble with manual ground balance detectors like the GB2. I have found that the GMT is the safer bet for most beginners as it offers both automatic and manual ground balance. The automatic GB is a safety net for the new user and even a pro will find it of use in wilding varying ground conditions. But as the machine is mastered the option still exists to manually fine tune the ground balance. This one thing alone would lead me to recommend the GMT if the unit is a persons first gold machine.

But like I said, I have to have both. Another thing I like about the Gold Bug 2 is that it can be hip or chest mounted. Great for long hours or working in deep water.

Many people do not know that the same engineer worked on both units. Dave Johnson was at Fisher when he had the major hand in designing the Gold Bug 2. And he was hired by White's many years later to work on the GMT, which is the newer of the two designs. The way I look at it one is not a Fisher and the other a White's - they are both Dave Johnson detectors. As is the Tesoro Lobo ST. Which is why I get a chuckle out of people doing the this brand versus that brand thing. They are more similar than they are different and in good hands you can't go wrong with any of them.

  
pinkmoose
04:32:14 Sun
Aug 30 2009

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Re: Fisher Gold Bug 2 versus White's GMT

Could discuss the new GMZ and how it relates to these two. I have been dragging my feet for 3 years about buying one and those 2 have been on my radar, but now I am reconsidering.
Question:
1. GMZ without the gain will signal on all metal and there will be no difference in the the tone?

Steve, I appreciate the info that you put on the various forums.


  
Steve_Herschbach
18:43:00 Sun
Aug 30 2009

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Re: Fisher Gold Bug 2 versus White's GMT

Hi,

Well, the GMZ is pretty simple. It won't hit gold as small or as deep as either the GMT or Gold Bug 2. But the GMZ is hotter than anything else that has a list price under $799.95.

The GMZ basically has no discrimination to speak of and so will have a person digging lots of junk if it is in the area. There is no difference in tone between gold or iron.

The GMZ with the small coil would be a very good unit for the Kenai Peninsula.

  

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