hi,
I've just been testing the 70 on some rocks and minerals that belong to my mother in law and on one quartz specimen the 70 gives off a good sound in prospect mode(using the 10x5 coil) even if i turn the iron mask up to 20 the signal is still strong in c&t mode its gives a solid 2 , I have another small quartz crystal with gold on it and it gives a solid -2 , unfortunately what ever it is, is hidden below the quartz crystals.I thought maybe it could be copper ,and before I resort to the hammer and chisel technique I thought I would ask here, Thought you guys in the US or Australia might have have encountered this.
I also tested the concentric coil on the gold sample in prospect mode same settings as the 10x5, a signal is there but nothing like the strong signal with the 10x5 .Excellent machine this 70!.
Sorry can't send any pictures at the moment.
Thanks
HH,
John
I've just been testing the 70 on some rocks and minerals that belong to my mother in law and on one quartz specimen the 70 gives off a good sound in prospect mode(using the 10x5 coil) even if i turn the iron mask up to 20 the signal is still strong in c&t mode its gives a solid 2 , I have another small quartz crystal with gold on it and it gives a solid -2 , unfortunately what ever it is, is hidden below the quartz crystals.I thought maybe it could be copper ,and before I resort to the hammer and chisel technique I thought I would ask here, Thought you guys in the US or Australia might have have encountered this.
I also tested the concentric coil on the gold sample in prospect mode same settings as the 10x5, a signal is there but nothing like the strong signal with the 10x5 .Excellent machine this 70!.
Sorry can't send any pictures at the moment.
Thanks
HH,
John