Saturday, September 1, 2018

The 10K gold cut off line

10 K gold is the reason why I barely use any discrimination on my metal detectors when beach or shallow water hunting.
You may be surprised to know the low metal detector discrimination setting that jewelry made of 10K gold is not detected at.
My books are full of 18K gold ring keepers dripping in diamonds I have recovered from the beach and Davy Jones locker, but it’s the 10K gold that moves the scrap gold scales and helps fund the pirate lifestyle. 
Often the largest gold rings and gold chains are made of 10K gold, so you better make sure you are not using too much metal detector discrimination.
In my opinion bottle caps are the main reason beach hunters walk over large 10K gold jewelry without detecting it, if you raise your discrimination level to reject bottle caps at trashy beach sites you will probably miss a lot of 10K gold jewelry.
Use a metal detector discrimination level that helps break up the audio response from a bottle cap but a setting that does not totally reject the bottle cap audio response.
A pesky nuisance target like a bottle cap will be easier to identify when detected and you will not have to worry about missing 10K jewelry.
A couple of years ago I recovered nine ounces of gold over a two day period at a local beach after beach erosion, many of the 10K gold pieces of jewelry were heavily encrusted in sand.
Encrusted 10K gold jewelry is easily missed if you raise your metal detector discrimination setting or rejected certain VDI screen numbers to avoid bottle caps.
When I test a VLF metal detector I always want to see where the different cut off lines for gold jewelry are, 10K gold is always the first gold to be rejected followed by 14K and 18K gold if you try rejecting aluminum pull tabs.
I actually like hearing trash targets at the beach because I can yell the difference between good and bad targets, but if you cannot hear the bad targets you are surely not going to hear good targets.
At trashy tourist type beaches use the minimum amount of discrimination you need to identify bottle caps, any more and you can kiss 10K gold jewelry goodbye no matter how large it may be.
When you find the sweet bottle cap discrimination spot you will find the big gold.
Telling the difference between a bottle cap and a gold chain helps you avoid having to dig bottle caps, telling the difference between a pull tab and a gold ring in five feet of water comes with experience.
In case your wondering, I hear the difference between the shape of the pull tab and the gold ring.
Lay off the discrimination even in trashy areas by using just enough to help you avoid missing 10K gold, often the gold jewelry with the higher amount of alloys in the mix when it’s made into something bigger.

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