The California gold rush in the 1840's caused mass migration hundreds of thousands of people. After the gold laying on the surface had been excavated, the miners went underground. They searched for quartz veins as quartz meant gold. Most gold has sunken to the earths core with other heavy metals like iron but some gold hitched a ride with lighter minerals like quaetz and that is why gold can often be found imbedded with quartz. The reason for this is because earthquakes cause natural fissures wh...
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