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Thoughts on coin depths.

D

Doctorcoinz

New member
I once got a honest 10 inch medium sized coin with an SE the signal was fairly iffy but good enough to say dig me excellent depth if you look at a tape measure and see the depth in front of your eyes . Mostly i get coins no deeper than 7 inches i think most coins don't sink deeper than 7 0r 8 inches any way , having said that i believe a few coins can for reasons unknown sink to 12 - 18 inches down especially on pasture or soil that is ploughed Only a pulse induction can get these 12 -18 inch deep coins , i would say 90% of all lost coins are within 8 inches with the remaining 10% at great depth . The big question is are many coins buried beyond our detectors range or are we getting most of them within our explorers range.
Thinking about it i wonder what coins are down there at say dream depth (12 - 18 inches ), any one agree with this , I think we have hit the limits of detection depth these days with most machines excluding pulse induction's of course. One thing of course to consider is that it is virtually impossible to dig a 18 inch deep coin out of a park! One thing i would like to see is a really good solid strong repeating signal on 10 inch deep coins as the signals i get are weak and easily passed over as trash at coin depths of 10 inches. Could a metal detector engineer please reply and tell me can we get any deeper than 8 - 10 inches on coins or are we at or close to the limits now.
 
I once dug up a 1962 memorial at a measured 9 inches deep with a DFX ( not noted for depth) with the stock 9
 
NASA-Tom Dankowski feels -- and I hate to speak FOR him -- but he has said as I understand it that we are near the limits, under the current "paradigm," (electromagnetic detectors). He says that for substantial improvements in depth, a "paradigm shift" is required...

NOT that there can't be improvements in detectors, but substantially deeper machines are very unlikely.

Steve
 
Cant argue with Tom always good advice. Masking really creates problems for us as does EMI. I thought it was interesting on my Xcal is written ..... that it complies with part 15 of the FCC rules.... operation is subject to: 1. Device must not cause harmful interference. 2. MUST accept any interference received including interference received including interference which may cause undesired operation.

That statement says there is operation limits..... add minerals, trash, iron.... da da da and 10 inches is going to get you some targets others walk over.

Dew
 
Water.

Ground water in the form of rain, run off, natural springs, or a high water table affect soil porosity and density, thus allowing a coin to sink further down than it would be
expected especially in situations of elevated compression (ex. tractor tires).

Ever go into a dry pine forest and find a hundred year old coin just inches under the pine needles? As opposed to a park dropped memorial cent/clad dime 10 inches down.
 
I am regularly getting an honest 10 inches on wheat pennies in my local park. These did not fall out of the side of the hole either because I still had to dig carefully to get to the depth of the coin in most cases. I may have had a couple coins closer to 12 inches after the last good rain we had. Hunting after a good ground soaking increases the performance of the SE in my area soil conditions.
 
Up here in the north, we add the element of frost. It heaves a lot of things back up out of the ground. More than once, I've found coins on top of large stones. Now whether they just stopped there or they were riding the stone to the surface I'll never know, but riding the stone back up is plausable.
 
Frost heave definitely pushes things back up. Especially, if a coin were froze solid on some small rock clumps beneath the ground.
So think if a deep coin was pushed up by some rock(s) not below the frost line, and then it warmed and some rain fell (early Spring), it is plausible
it could even sink deeper from all the underground commotion.

http://en.wikipedia.org/wiki/Frost_heave
 
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