Hi Big Nugget, welcome to the forum. Well the gold will be visible if its giving you a good signal. so smack the quartz hard with a lump hammer/sledge hammer with safety glasses on and break it into pieces. If you then cannot see some obvious gold the detector should tell you which piece of quartz has the gold in it. If each broken piece of quartz give a signal response then it may be iron or mineralisation giving you a signal.
Good luck.
RDD
Good luck.
RDD