coin hunting in parks, etc.?---If so, how's it working out on the medium to deeper coins? (in this type of setting)-----I've been using it for relic hunting in one of the nastiest "iron pits" you could imagine.----The target seperation in iron (5" coil) is just amazing---been pulling good targets (mainly eagle buttons) out of ferrous trash that you wouldn't think was possible.-----Was just wondering how it's doing for coin hunting & in probably mostly non-ferrous trash?---------Del