ezee, A grain is quite a bit smaller than a gram. Note the pictures. I can probably show you lots of places in North Georgia. I retired out of the Army and spent many years prospecting there and in North Carolina. My wife is from Rutherfordton, NC. Talk to any of the current owners at Vein Mtn, LDMA camp, Thermal City or The Lucky Strike and you will find that I detected and dredged all those areas fifteen years before they even became pay to mine sites years ago. The same thing down in Dahlonega and the surrounding area. I dredged for years around that area and was one of the first with a dredge in many of those creeks. I also detected quite a bit in those areas. Yes, the ground is hot but nothing compared to what we have out West. If you know your unit you should not have a problem with hot rocks. There is quite a difference in the signal on most hot rocks over the size of bean than the signal of a piece of gold the same size. Smaller hot rocks are bit tougher thats why you need to have good hearing and know your signals. I like to work among hot rocks as that is where the gold shows up. It all comes with years of experience.
I would like to see you get on some detecting forums where many of the detectorists are professionals, Arizona Outback, Nuggethunting, Nuggetshooting. Show these guys what you posted about the Lobo, Gold Bugs, and what you call a picker, and give them your ideas on a grain verses a gram and being able to hear. Tell them that a Lobo cannot hear a bb at three inches. These are people that make a living or have made a living out of detecting gold and most of it was or is sub-grain and sub-gram gold. I have nothing against Garrett products, they just have not proved out for me and many others, not as fine gold sniffers. If you are happy with the performance that you are getting then by all means stay with it but note that many people will be passing you up as "Those other machines'' really do better than what your tests are showing. If they did not then they would not still be on the market. If you have done such exhaustive tests then maybe you should be advertising the product. I am not afraid to support my Gold Bugs, check any of the ads in all the major mining magazines and you will see me supporting the Fisher GB Pro. I use equipment that works and if it does not then I am looking for something that will. If someone comes out with a detector that will do better on fine gold than the GB Pro or GBII, a Lobo or a Eureka Gold then I will drop what I have and buy it. After trying the AT Gold against those others it just is not the one I would trade up for or be able to honestly tell people that they should get.
Actually the GB Pro is not that popular in Australia but it is starting to gain momentum amongst many. The GBII is still the top earner as far as a VLF machine. I have posted and shared many of my posts from AZO on a few Australian forums and people are starting to pick up on it. I have friends in Australia that are,were, die hard GBII users and have changed to the GB Pro. I have many others who have not. Many people choose to continue to use what they know if it is working for them. Again, these are just my opinions. TRINITYAU/RAYMILLS