James W. Marshall discovered gold at Sutter's Mill (reconstruction pictured) in Coloma, California, leading to the California gold rush.

James Wilson Marshall was an American carpenter and sawmill operator, who on January 24, 1848, reported the finding of gold at Coloma, California, a small settlement on the American River about 36 miles northeast of Sacramento. His discovery was the impetus for the California gold rush. The mill property was owned by Johann (John) Sutter who employed Marshall to build his mill. The wave of gold seekers turned everyone's attention away from the mill which eventually fell into disrepair and was never used as intended. Neither Marshall nor Sutter ever profited from the gold find.

Sutter's Mill was a water-powered sawmill on the bank of the South Fork American River in the foothills of the Sierra Nevada in California. It was named after its owner John Sutter. A worker constructing the mill, James W. Marshall, found gold there in 1848. This discovery set off the California gold rush (1848–1855), a major event in the history of the United States.

Coloma is a census-designated place in El Dorado County, California, United States. It is approximately 36 miles (58 km) northeast of Sacramento, California. Coloma is most noted for being the site where James W. Marshall found gold in the Sierra Nevada foothills, at Sutter's Mill on January 24, 1848, leading to the California gold rush. Coloma's population is 521.

The California gold rush (1848–1855) began on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill in Coloma, California. The news of gold brought approximately 300,000 people to California from the rest of the United States and abroad. The sudden influx of gold into the money supply reinvigorated the American economy; the sudden population increase allowed California to grow rapidly into statehood in the Compromise of 1850. The gold rush had severe effects on Native Californians and accelerated the Native American population's decline from disease, starvation, and the California genocide.