We are considering purchasing a GPR for evaluating underground geological changes and anomolies in 3d feedback processed through a field computer you carry with you and the transciever. Specifically locating gold is our primary target. Anyone have insite to the various mfgs and the type of units being offered, recommended software? We would also like to be able to distinquish different types of minerals and rocks such as quartz, feldspar, granite etc.... Quite often clay from inches to many feet will be covering the nuggets or pockets. We are trying to seperate science from sales!!! Is this current technolgy available?