Gold was discovered at Sutter's Mill in 1848 — and the man who found it died penniless, while the merchant who sold supplies to miners became fabulously rich.
On January 24, 1848, a carpenter named James Marshall spotted something glittering in a millrace at Sutter's Mill in Coloma, California. His employer, John Sutter, tried desperately to keep the discovery secret — he knew a gold rush would destroy his agricultural empire. It did.
Word spread anyway. Within a year, roughly 90,000 people had flooded into California from around the world — Americans, Latin Americans, Chinese, Australians, and Europeans, all chasing the same dream. By 1855, an estimated 300,000 people had made the journey, transforming California from a sparsely populated territory into a state in just two years.
The real fortunes were made not by miners, but by the people who sold them things. Samuel Brannan became California's first millionaire by buying up every shovel, pick, and gold pan in the region before publicly announcing the discovery. A merchant named Levi Strauss made his name selling durable denim pants to miners — and built an empire that survives today.
The forty-niners (named for the peak year of 1849) endured brutal conditions. The overland journey took four to six months across deserts and mountains. The sea route around Cape Horn took five months by ship. Cholera, scurvy, and exhaustion killed thousands before they even reached the gold fields.
An estimated 12 million ounces of gold were extracted in the first five years of the rush — worth tens of billions in today's dollars. But most individual miners barely broke even after paying for food, equipment, and claims. By 1853, the easy surface gold was gone and large-scale company mining had taken over.
The Gold Rush had catastrophic consequences for California's indigenous people. Historian Benjamin Madley documented that between 1846 and 1873, at least 9,400 to 16,000 California Indians were killed by non-Indians, predominantly in massacres. Disease, starvation, and the destruction of hunting grounds killed tens of thousands more.
San Francisco was transformed almost overnight. In 1846 it had roughly 200 residents. By 1852 it had 36,000, with new buildings going up so fast that ships were simply abandoned in the harbor and used as warehouses or hotels. The Gold Rush essentially invented modern California.