thanks tom, any ideas what would be his best bet on a coil.... we only detect in the randsburg area of Ca and we do go accasionally to quartzite Az. we have access to a trailer there family owns so we use the quartzite metal detectors club claims. i hear the 5 inch and i hear the 6x10. we had a chance when we bought it to get what coil we wanted and he doesnt like a tiny coil, hes learning and doesnt understand that its not all about coverage but patience and just getting over a nugget. but it definately needs to hear it to be able to get it. john