As one might expect, gold is the official state mineral and was so designated in 1965. In the four years following the discovery of gold by James Marshall in January of 1848, California's population swelled from 14,000 to 250,000 people. Miners came from all over the world and extracted 28,280,711 fine ounces of gold from 1850-1859 which would be worth approximately $10,000,000,000 today. Although production is much lower, present day prospectors can still pan for gold in California's streams.