On January 24 1848, James W Marshall discovered gold in a lumber mill (Sutter's Mill) tailrace along the American River. Although John Sutter tried to keep this fact quiet, fearing the loss of his agricultural empire, word got out and hundreds of thousands of people came to California, looking for gold. The people, known as Forty-Niners, came from everywhere. Some did exceptionally well and others returned home penniless. The early 49'ers panned for gold along stream beds and eventually larger-scale placer mining became more common. As the romance and excitment of the original Gold Rush dwindled away, gold mining techniques...