The black sand is a good sign that there could be gold around. You always find black sand with gold but you wont always find gold in black sand. It's magnatite and it is highly mineralized. A normal metal detector freaks out, especially if the black sand is wet... The stuff on the surface is likely pyrite. Gold is heavy and will rarely be visable. Tweakers are the new "crackheads" lol. I guess I'm a crackhead cause I cant stop thinking about that crack lol. It had this blue mud at the bottom that the old timers would find great gold in. Be a good spot to detect if there wasn't lead everywhere.