Have tested out my Garratt EuroAce in my permission over the weekend to "get a feel" for it as I'm a total newbie.
I especially wanted to get an idea of the soil and ground conditions, and after a frustrating morning of digging at signals with very limited results (old tool heads, plough spike and fenceposts found).....it seems that across several of the fields the underlying rocks are igneous - mainly basalt - which was confirmed both with the farmer and the available geological maps.
I got the impression (checked by digging) that the changes in the rock/soil depth were producing "results", as well as where broken clumps of rock were in deeper-soiled areas.
I am a very patient and methodical person in my work, and would like to know whether a methodical approach would pay off especially here? I am thinking that although I would hear almost constant pings in these areas, that applying more discrimination and also re-swinging from various directions/slower swings would assist in eliminating signals that were more than likely false?
Any advice from anyone who has worked similar areas would be much appreciated!
Thanks in advance!
Basalts are high in ferromagnesium minerals and these do react with a detector. I sometimes come across cobbles of basalt and other basic igneous rocks in the areas i search which have come from the glacial tills or glacial outwash gravels. Some give a good sound ,but it is always noticable and i know what they are so rarely have to dig them.
If you are on a layer of basalt then it will give you problems. Many years ago in the days of using the Arado 120 i got permission for a field in Scotland whilst on holiday and that was undetectable with that machine because it was underlain by basalt lavas.
Keep us posted on how you get on.
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