Also as the waters cool, things like quartz and sulfides become less soluble and they come out of solution to form veins. The most common conduits for these solutions are natural fault zones; this is why most veins are shaped like fault zones, a long and narrow plane. This is the process that forms nearly all goldquartz veins.
Gold encased in quartz rock, also known as gold specimens, are highly sought after by collectors and prospectors. They can be hard to find, but using the proper equipment and tactics, it is possible to find beautiful specimens.