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Interesting phenomena

M

mwaynebennett

New member
Today I had a meeting in Portland Oregon, about 150 miles from my home. I left early and stopped by my hometown to get in about 30 min of MD. I knew where we used to use our sleds in the snow and thought I would give that hill a try. I found two silver rings, each marked "sterling sliver, however one was very small, It would only go down to the first knuckle of my pinky.

The interesting phenomena is that this small silver ring showed up as zinc. I have read that small gold objects show up as iron, so it appears that the ID scale is calibrated on coin-sized objects also and objects smaller than a coin appear shifted towards the iron end of the spectrum.

This phenomena of the size influencing the ID also explains why large aluminum objects shift the ID towards the other direction and appear as silver. My BH has provided at least 10000 "$1.00" indications and I am confident virtually all of them were not silver.

Have any of you noticed this phenomena?

Mark
Elite 2200
WA St.

PS: Based upon the 20'x50' area I scanned, there must be about 5000 rings in that park.
 
You better get busy then. I would think that the ring came in lower because of the hole in it.
 
Well Dave, all the other silver rings I have found had holes in them where the finger goes and they all registered as a dime or quarter. They were larger than the small one I found today.

Mark
Elite 2200
WA St.
 
Mark, I'm glad to see that I'm not the only one who gets a bunch of 'silver dollar' hits on the BH. All of mine show at 6", and are usually very repeatable. I have stopped digging them because they are always crushed aluminum cans at about 8". I think it's time for me to take a real silver dollar and bury it, just to see what it would really look like.
 
Mark I think you are correct. These machines were calibrated to coin sized objects. This will cause false IDs, then we must learn other techniques to disc out the aluminum can and still find the Silver Dollar

Jeff
 
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