Hello! I am somewhat new to metal detecting. I live around the Waco Texas area and Have a creek that runs behind my house that is a deep run off with caliche, quarts veins and lots of iron and pyrite. Have not found any gold yet. Any suggestions. I have a new gpz 7000 that still gives a lot of ground noise which may be due to all the iron????? That may be part of problems. Any suggestions would be helpful : )