Coils are, i have one for f75, had it out in light rain no trouble, you might find a heavy down pour its not going to handle, never tested it. I've had the business end submerged without a hitch. Has excellent discrim and depth but as far as gold goes alas it remains unproven to me. Will pick up .22 lead shot no trouble. Definitely say its an all rounder not really a dedicated gold getter, not from my reading there are much better machines including vlf that will do a better job in right hands.