Tailings from century-old hydraulic gold mining.

Michigan Bar on the American River, Folsom, Ca. Dec. 2017. Gold mining started here in the mid 19th century and continued into the 20th, and the region has mile after mile of water-polished rocks, places where all the soil and smaller rocks were washed away. Brush or scrub forests have covered some of it, but a century or more later plenty is still bare rocks.

Done