Tom_in_CA said:
Good post Steve.
But a question to you now: What do you think of some persons (even dealers who should know better), who say that gold vs aluminum can be learned simply by tones ? Eg.: "roundness" "softeness" "repeatability" and so-forth. Oh sure, they might qualify that and say "with 80% accuracy", etc.... But at the SAME time, leaving their customer (or the viewer of their video) with the notion that: "If I just study long enough and hard enough, there is a difference between gold and aluminum to a high enough degree, that I can go out to junky blighted parks and pass 'most' just, and concentrate on 'mostly' gold items"
Heck Tom, you are a gold coin god in my book, and you are asking me? You know the answer of course - you just want me on the record!
I have dug very many pounds of gold in my time with a detector. I obsess over the technology and am plugged into what is going on better than most. There is no gold detecting tool I would not buy if I believed it would help me recover more gold.
No, there is no way to tell gold from aluminum from lead, etc. I have dug large gold nuggets that read as high as silver coins due to their purity, size and shape. There are tricks one can play with jewelry and statistics due to where most rings fall in the VDI scale versus other targets, but that is playing the odds. Rings at shallow to moderate depths do indeed produce high tight VDI hits on my DFX/BigFoot (love the SignaGraph) and if I ignore zinc penny on up I can dig nickels, every pull tab ever dropped, and maybe a gold ring. There are actually quite a few tricks one can play with the statistics of it but it has nothing to do with being able to tell one metal from another. And every item notched carries away with it a potential gold target.
It is more about site selection than anything in my opinion. If I believe, based on my experience or just gut feeling, that an urban location is a good gold site, I will recover all non-ferrous I can pop with a screwdriver. No plugging - half the game is volume. Either I am right or wrong and I either dig a ton of aluminum and get some gold if right, or a ton of aluminum only if wrong!
Sadly, the gold prospector in me knows that very small gold nuggets or large gold nuggets at fringe depth read ferrous in bad ground. Anyone that knows their VDI scale knows ferrous and non-ferrous overlap, but few see it like prospector do. Faint little ferrous hit, scrape a couple inches off with boot, reading turns non-ferrous, dig ten more inches, recover 1/4 oz gold nugget. On beaches I use a PI or out prospecting I use a GPZ 7000 and dig everything that beeps. Even ignoring ferrous will cost you gold.
The good news? Tons of good targets left out there being passed due to target masking and improper VDI at depth. You and I are old enough they will not have outlawed all the places before we croak so we just need to keep digging while we can. I will also say this - if people want to cherry pick with their detectors and have fun doing it, who cares really? This ain't about getting rich, it's about enjoying what we are doing. Let them believe what they want to believe. If they want to leave some gold for me it does not hurt my feelings.
Best wishes to you Tom!
Some park digs, before and after sorting for the photo.....
http://www.detectorprospector.com/forum/uploads/monthly_2016_06/trash6.jpg.2d29c5ea140f13b5871fc877904e53a7.jpg
http://www.detectorprospector.com/forum/uploads/monthly_2016_06/trash7.jpg.64d2dfe2d8b698db72c5a0ec44b5f95a.jpg