I've just bought a GPX4500 and wondering what is the best coil for picking up small shallow gold (sub 1g) in the Victorian Golden Triangle, which is typically highly mineralised. The guy at the shop I bought it from was very indecisive so I walked away with nothing to do the job. I do have the standard 11" DD and 15x12" Mono that came with it, but thinking I may need something smaller. From what I understand a small DD will handle the mineralisation better, but I here a lot of people raving about small mono's. Any thoughts would be greatly appreciated. I'm so desperate to find some yellow around diggings. Cheers Dig'n-it.