I felt the need to dig some big copper coins which have been thin on the ground for me lately, so I hit up my favourite bush site despite the fact that I haven't pulled a coin or much worthwhile at all out of it for six months now. I'm fairly sure this site at least at the beginning used to be an old slab hut (early 1860s), at about 4 inches down there's a 2-3 inch thick layer of extremely hard clay which must have been the floor - I originally thought it was just baked clay from a fire but it covers a reasonably big area which correlates well with the abundance of relics. The ground returns to regular compacted loam below the clay so it's definitely a man-made layer. The fun thing about it is that a lot of the relics
below the clay, with a lot of mid-1850s tokens and coins in good nick wear wise, which gets me thinking about whether there was a previous occupation before everyone moved into the area in the early 1860s.
I decided to mix it up a bit and run Park 1 with no iron rejection at all. For giggles I turned the iron bias off completely as well, something I haven't tried seriously before. When .22 bullets started jumping out of this fairly well covered ground I realised I was onto something! It didn't take long before I managed to work up an intermittent but stationary 18-19 in among the nails. I broke through the floor clay layer to find a sandstone / quartzite ball that someone a) carried a long way and b) spent a lot of time making round - the site isn't stony at all, the creeks nearby don't have any stones in the beds and the ones that do a bit further afield never have round rocks. The signal was coming from under the stone at a depth of nearly the length of the pinpointer:
Can't trust the numbers, these pennies usually ring up solidly in the mid 20's! At a deep 18 I was certain I was digging an old belt buckle or large chunk of lead. I've been over this exact patch many times running on an iron bias of 1 with no target, now I get to do it all again with none. These are my favourite coins to dig, I rate them above all the old silver, they're just so chunky!