White's GMT Metal Detector
- Product Review (submitted on April 15, 2016):
- 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. 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.