James W. Marshall finds gold at Sutter's Mill, starting the California Gold Rush

Background. James W. Marshall was an American carpenter and sawmill operator. In January 1848, construction issues at Sutter's Mill led to an inspection of the tailrace. The Mexican-American War had begun in May 1846, and a ceasefire in Alta California was agreed in January 1847. The Treaty of Guadalupe Hidalgo was signed on February 2, 1848, transferring California to the United States, though news of the gold discovery had not yet arrived.

Discovery. On the morning of January 24, 1848, Marshall noticed shiny flecks in the channel bed while examining the mill's tailrace. He found flakes of gold in the South Fork American River. Bigler recorded this date in his diary. Marshall reported the finding at Coloma, a settlement on the American River about 36 miles northeast of Sacramento. This discovery set off the California Gold Rush.

Immediate Aftermath. Marshall returned to Sutter's Fort four days later, after the war had ended. Sutter sent Charles Bennett to Monterey in February 1848 to secure mineral rights. By March 1848, rumors were confirmed by Samuel Brannan. The New York Herald reported the discovery on August 19, 1848. The influx of gold reinvigorated the American economy and contributed to California's path to statehood.

Historical Context. Prior to 1848, Mexican miners from Sonora worked placer deposits until 1846, and Mission Indians made minor gold finds. The discovery occurred in a region overrun by US forces in 1846. The event is commemorated by a statue of Marshall pointing to the discovery spot. A replica of the mill was constructed in 1965 based on Marshall's drawings and a circa 1850 photograph.