With the California Gold Rush, fortune seekers flooded into the West. Thousands scattered into every Sierra ravine looking for widely distributed gold flakes and nuggets in placer sands deposited by creeks and rivers.
Placer miners moved from one place to the next. They used inexpensive, movable wooden boxes called rockers and long toms to wash sand away from gold. The gold pan, a cliché of placer mining, had a limited capacity and was only for sampling sites during prospecting.