NZ Poohbear and I did a coil test this weekend. Being the pathetic prospectors that we are we only had one little nugget about the size of a paper match head between us. Regardless we persevered and while Poohbear swung the coils I measured.
Turns out the only place at his house that did not have heaps of trash under the ground was out next to the sidewalk. Because the location was directly under the power wires we had to turn the sensitivity down on the F75, but ran the Gold Bug full blast. We set the nugget on a plastic container and just did air measurements because Poohbear was too lazy to dig and undig the nugget over and over for a proper test. Plus we were hungry and had a reservation at Sequoia 88 that we did not want to miss.
What we learned was that we probably needed a smaller nugget to see some real differences, and that it is hard to get an accurate measurement so don’t take the numbers literally. Results:
Gold Bug 5” Coil 77mm
Gold Bug 10” Coil 85mm
Gold Bug 11” Coil 83mm
F75 5” Coil 80mm
F75 11” Coil 73mm
F75 15” Coil 50mm
In summary what I determined was that with this nugget the 10” and 11” inch coils are about the same as a 5” coil. Also, the F75 is about as good as a Gold Bug. Except for that 15” coil, the nugget was about at the size limit of what it would detect.
I would like to get a variety of nuggets and do it again, but thought this information might be interesting to someone.
rgmcbrid attached the following image(s):
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