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. The mill was later reconstructed in the original design and today forms part of Marshall Gold Discovery State Historic Park in Coloma, California. A meteorite fall in 2012 landed close to the mill; the recovered fragments were named the Sutter's Mill meteorite. History The territory of Alta California, which includes modern-day California, was settled by the Viceroyalty of New Spain from 1683 onwards. It became part of an independent Mexico in 1821. John Sutter, a German-Swiss settler, arrived in the region in 1839. He established a colony at New Helvetia (now part of Sacramento), in the Central Valley. The United States conquered the region during the Mexican–American War (1846–1848): California was overrun by US forces in 1846 and a ceasefire in the region was agreed in January 1847. A peace treaty for the wider war had not yet been completed when Sutter decided to begin construction of a sawmill in the forest about 30 miles north-east of his existing colony. Sutter employed James Wilson Marshall, a carpenter originally from New Jersey, to supervise construction of the new building. On January 24, 1848, while working on construction of the mill, Marshall found flakes of gold in the South Fork American River. On February 2, 1848, before news of the discovery had arrived, the Treaty of Guadalupe Hidalgo was signed in Mexico City. This peace treaty formally transferred sovereignty over the region to the United States. Two workers at the mill, Henry Bigler and Azariah Smith, were veterans of the Mormon Battalion and recorded their experience in journals. Bigler recorded the date when gold was discovered, January 24, 1848, in his diary. Sutter's claim to the US government for mineral rights was investigated by Joseph Libbey Folsom, who issued confirmation the gold discovery in June. The first flake found by Marshall was shipped to President James K. Polk in Washington DC, arriving in August 1848. It is now on display in the National Museum of American History, part of the Smithsonian Institution. As news of the gold spread,