Everything in Placer County history leads to gold, from its name--the Spanish term for gold-bearing gravel--to the mining camps that sprouted overnight in its rugged river canyons. Ecstatic cries of "Gold on the American River " in 1848 launched the largest voluntary migration in the history of the world. As claims "panned out," thousands of miners swarmed like locusts between the rough-and-tumble mining camps, from the crest of the Sierra Nevada...