In 1860, at the confluence of the Sacramento and San Joaquin Rivers, settlers founded the village of Black Diamond. Named for the coal that was mined in the Mount Diablo foothills, the village of Black Diamond flourished as a shipping port for coal bound to Stockton, Sacramento and San Francisco and a stopover for gold miners bound for the Motherlode. In 1911, with the coal running out and new industries on the rise, the town of Black Diamond became the city of Pittsburg.