My understanding is that if you are deriving income from prospecting as a "hobby" then tax is not applicable. Provided that you are not claiming any expenses as tax deductible, then you should be in the clear. I met a full timer who has a lease, detecting equipment and heavy machinery to dig up...
A quick look at Geovic will show you where the diggings are dirtdiggin. I just had a look and the indication is that there were substantial shallow diggings in that area. Cheers and good luck mate.
Detectormod battery is about the size of a cigarette packet. I use the double one (2 cig. pack size)Velcro'd to side of control box and weight is minimal. It lasts me two days fully charged, but I would rather charge daily if day is a long session. My Pro sonic transmitter is attached to it and...