The summation of the two individual supply curves will generate the market supply curve for that product. Consider two wineries in the Paso Robles region. Paso Winery may be willing to supply 20 bottles if the market price were $10/bottle but willing to supply 100 bottles if the price were $50/bottle.
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 first discovery of gold, at Rancho San Francisco in the mountains north of present-day Los Angeles, had been in 1842, six years before Marshall's discovery, while California was still part of Mexico.