The Gold Rush in California, United States of America during 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. The miners searched for quartz veins as quartz indicated gold. Most gold sinks toward the Earth's core with other heavy metals (eg. iron etc.) but some gold hitches a ride with lighter minerals (eg. quartz etc.) which is why gold can often be found imbedded with quartz. The cause for th...
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