First off, do not sell your MXT which is working for you to keep a Gold Bug 2 which is not! If, and I say if, you can get the Gold Bug 2 to actually work for you, then consider keeping it.
I only mentioned what I personally would use if on a budget and determined to get some gold in Australia. Many other detectors, like the White's TDI, could be a better choice depending on the situation. I know a couple people that clean up with GMTs over there. I am only observing that while in Oz I found it easy, I say easy, to find gold on well known pounded patches with a Gold Bug 2. People are generally looking for larger gold and therefore using PI detectors, and I do not care what any PI fan says they leave lots of small gold behind. Chris Ralph brought his Gold Bug Pro and I brought my Gold Bug 2 along to Australia for our month long trip with Jonathan Porter, and although the GPX 5000 units got most of the use, we did give the VLF units a go. The consensus surprisingly was that the Gold Bug 2 handled the intense mineralization better than the Gold Bug Pro due to the extra adjustments available. When you look at the pictures you can see how the ground is. We were in ironstone country around Meekatharra. We hunted areas with the GPX units and went back over the same places with the Gold Bug 2 and easily found small gold passed right over with the GPX. JP took such a liking to my Gold Bug 2 I left it with him!
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Steve Herschbach & Chris Ralph with Gold Bugs in Oz - note how we have stacked surface cobbles to get closer to gold
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Steve Herschbach & Jonathan Porter compare Gold Bugs
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Gold Bug gold in Australia - yeah, a GPX could have got three of those... but did not!
The easy way to hunt with a Gold Bug 2 is in iron disc mode. Hot rocks pop and click and gold goes beep. It gets less depth and sensitivity than normal but is still more sensitive than other detectors. All metal is more powerful but you do have to train your ear for what is ground noise or hot rocks and what is gold. Gold hits harder. There is of course a balance in using less sensitivity to get smoother operation, but at the end of the day the Gold Bug 2 is a harder detector to master than most. It is why I often recommend the White's GMT for most people instead as the GMT is easier to learn. The GMT also gets better depth on large gold. The GB2 has very poor depth overall, But once you master the GB2 it is a real performer on shallow small gold. I dig 95% of my GB2 gold at three inches or less.
I am having doubts anyone will ever build a better small gold detector than the Gold Bug 2 and have two for when it goes out of production. One to use and one just in case.
Steve Herschbach