Hi,
I think that it's possible to detect gold in a range of some meters or plus. It 's true that gold don't release ions but it can form a ground battery with other metals and/or minerals also if they are not near gold, it takes only several years in order that the battery "appears"; this is the "long buried" effect! A battery in the ground can add its own voltage to existing E-field and then it can deform its induction lines. The conclusion may be a different distribution of ions that are normally in the air: if this explanation is true it's possible to test our ion detector with a sample of gold and an iron rod sticked in the ground at few meters...
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