This book will get you hunting in the right places and finding some great stuff

where visual cues disappear and detectorists rely on audio feedback to center the coil over a target before scooping

Detectorists who run multiple search coils keep a spare lower shaft for each coil

We've used the XP classifier on desert benches in Arizona where the gold is flour-fine and the host material is heavily oxidized

Iron Discrimination)

Minelab 18" Commander Coil - Maximum Depth for GPX/GP/SD slimline coil This book will get youThe 18" Commander Monoloop coil delivers the deepest detection capabilities in Minelab's Commander series, specifically engineered for prospectors who need to reach deeply buried gold targets that smaller coils simply can't detect. Key Performance Benefits Maximum depth detection reaches deeper gold than any other Commander coil Superior ground coverage covers more territory per sweep for efficient prospecting Water resistant construction handles