I no longer dig many alum screw caps anymore.

[bugg]

They tend to read at 82-83, same as the zinc cents. But I have noticed that the zinc cents usually darken the "pie chart " from 25 -50%, where as the aluminum caps, usually show no or little darkening of the pie. I did get fooled by one cap today, as the pie was 25% dark, with the 82-83 reading. Also many aluminum targets in the aluminum range do not darken the pie either. I will have to experiment to see if gold rings darken the pie. If they do, that may be a way to pick out gold in the aluminum range.

 

[Elton]

n/t

 

[anton]

just an indication of the the ground mineralisation?, like the fe bars on a fisher, I don't think the pie chart has anything to do with an individual target id...

 

[Phillip_in_NM]

Five of the gold rings I've found with my M6 showed up as screw caps. I dig them all. I'd much rather have a gold ring than almost any coin.

 

[Cal_Cobra]

I have found out with crown caps that if you drag the coil off the edge of the target, the TID will drop down to about 18, a coin (or ring) would be a clean TID drop off to nothing.

That said, if I'm at an old site trying to eek out old coins and relics, I'll still dig these iffy signals for a while to get a read on the site.

 

[bubbadirect]

Very true Cal! Good signals tend to stay right I've found.

 

[bugg]

Its just an observation I have been watching. maybe just coincidence. I'll know for sure in a few more months of use.