I just skimmed over this thread. For anyone who wants to know about long time buried objects, there is radiation from the object from interaction with the air, supposedly ionization. If a target gets buried, this part of the target's field is cut off until it slowly builds up a halo. I have heard the target needs to be buried more than eight inches deep to cut off this part of it's field. I buried two gold rings and could not get a response off them for about a year and a half. One ring was 10K so there is a lot of alloy. I could see how pure gold could take much longer. I buried them three feet deep and the sub-soil moisture around here has been minimal. Most I've heard says five years before detection. Some say much more time. This could be due to the amount of alloy. Obviously the type of locator used will have some effect of the amount of time needed.
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