G'Day Bontje
Welcome to the forum mate :Y:
Your more than welcome to come up to my farm with your great detector and go over this patch out the back of my farm, I have been over the same area several times and this patch of a couple of square meters just gets my cheap detector going off it's tits. I have scrapped around to see if old iron is there and none found, now just below the ground is solid rock and a heap of quartz is thru out the area.
Now just be aware we do have black snakes out there and they do keep to themselves and I'll tell you about one account with them.
I have a spring fed dam out the back and I setup a 3" water pipe so I can pump water out to take over the hill for watering our garden and oneday I was there there was this black snake with his head under a cow pat. As it wasn't moving I just setup my Honda fire fighter pump and filled a IBC on my trailer and the snake never moved an inch. About an hour later when I went to get another load that snake was gone. So I walked about a metre away from the reeds and the noise of snakes was there to be seen and they didn't even show a face. If we are lucky we will see a snake skin that measures about 3 metres and thats the big mummy snake and would be over 30 years old.
Cheers Bryan