Good Morning Hickory Joe and a late welcome to Treasurenet!
You've come to the right place for a variety of answers to your question as it has been answered here before though since the last time there are now newer machines on the market. A popular thread is Lanny's Bedrock and Gold - a huge amount of information in that wonderful long read! Then Steve Herschbach has his own site with more information. Terry Solomon has been prospecting/detecting since there was dirt. Jim Hemingway up in the "North Country" has been at it for a long time hunting for silver in Canada.
Then the new machines with the PI's going up way over $1,000.00 and lots of VLF detectors have come on the market in the last two years. EVERYONE of the above people and many more here on TNET will tell you that detecting for gold In The Mountains is one of the most difficult forms of detecting to do, that said even I have found it with my GMT VLF detector and I am NOT an expert with my detector! When I started finding gold with it I also started sluicing as panning is literally a pain in the back, the smaller GGT sluice would be perfect for what you expect to be doing. I talk about sluicing as detectors will find some very small gold particles that can be panned but it is a pain in the back to do. However if one sits down in the water (with a closed cell foam pad under them and a comfortable rock at you back) panning can be more pleasant though likely colder.
There is a steep learning curve for even the simplest detector, the steepness is decreased by using the detector in the city over your own "Test Garden" as well as at local parks. In the mountains the ground mineralization will add a new "thrill" to what your detector tells you so there is an In The Mountain training period for whatever the ground condition is like for any particular canyon.
The detector you've listed is HEAVY! Of course none of them are feather weights but the Minelabs need lots of electrical power so large heavy batteries are what must be used with many of that brand. Which Detector is best is determined by the user though if where you want to go has a heavy iron layer on top then the VLF's will not make a dent in that - Lanny use's a VLF to begin with and then goes to his Minelab PI for the clean up.
So welcome to the group of Sick-O's that waste so much of their time out in the hill's looking for the yellow metal! Of course that is not what drives us as we also just enjoy being out there, err at least I do.....................63bkpkr
Ah yes, accessories for the detectors will also add to their cost but are Necessary, like a Good pair of headphones. I believe it is the Bluetooth headsets that have a lag in the signal and that is only going to ruin a persons experience detecting. Also, not only will you be listening for the detector to beep (or whatever) at a target you will also want to listen for the threshold hum to drop out/go away as that could also be a good target. Wireless headphones are Very Nice as the cord will not be there to grab bushes and rocks. See what fun awaits you! Hence, you need to enjoy being out there as hunting for gold with a detector can be slow going. There is always carrying in a diving mask so you can see in the water while swimming as you can tell how many fish might be there and then again you might just see a nugget laying out in the open that has your name on it, this is called sniping and on hot days it can be a pleasure but cover your bare back as the sun is there to help you see and to give you a sun burn.
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