Hydraulic mining is a form of mining that uses high-pressure jets of water to dislodge rock material or move sediment. In the placer mining of gold or tin, the resulting water-sediment slurry is directed through sluice boxes to remove the gold. It is also used in mining kaolin and coal.
Malakoff Diggins State Historic Park is a state park unit preserving the largest hydraulic mining site in California, United States. The mine was one of several hydraulic mining sites at the center of the 1882 landmark case Woodruff v. North Bloomfield Mining and Gravel Company. The mine pit and several Gold Rush-era buildings are listed on the National Register of Historic Places as the Malakoff Diggins-North Bloomfield Historic District. The "canyon" is 7,000 feet (2,100 m) long, as much as 3,000 feet (910 m) wide, and nearly 600 feet (180 m) deep in places. Visitors can see huge cliffs carved by mighty streams of water, results of the mining technique of washing away entire mountains of gravel to wash out the gold. The park is a 26-mile (42 km) drive north-east of Nevada City, California, in the Gold Rush country. The 3,143-acre (1,272 ha) park was established in 1965.
The Yuba River is a tributary of the Feather River in the Sierra Nevada and eastern Sacramento Valley, in the U.S. state of California. The main stem of the river is about 40 miles (64 km) long, and its headwaters are split into three major forks. The Yuba River proper is formed at the North Yuba and Middle Yuba rivers' confluence, with the South Yuba joining a short distance downstream. Measured to the head of the North Yuba River, the Yuba River is just over 100 miles (160 km) long.
Graniteville is a small, unincorporated community and census-designated place (CDP) located in Nevada County, California, United States. The town sits on the San Juan ridge separating the Middle and South Forks of the Yuba River, approximately 26 miles (42 km) northeast of Nevada City. The elevation of Graniteville is 4,977 feet (1,517 m) above sea level.
The San Juan Ridge is a geographic feature extending approximately 24 miles (39 km) east-northeast between the South and Middle Yuba Rivers in the foothills of the northern Sierra Nevada. The elevation is approximately 790 m (2,600 ft) above sea level.
North Bloomfield is a small unincorporated community located in Nevada County, California.
Lake City is an unincorporated community in Nevada County, California. It lies at an elevation of 3300 ft. about 10 miles northeast of Nevada City as the crow flies, and about three miles southeast of North Columbia, and three miles southwest of North Bloomfield. It is located at the junction of modern day North Bloomfield, Back Bone and Lake City Roads. It was an important mining and transportation center in the second half of the 19th century.
Moore's Flat was a historic mining town located on the San Juan Ridge about 19 miles northeast of Nevada City, California and about 5 miles northeast of North Bloomfield, California. The town was about 1 mile south of the Middle Yuba at an elevation of about 4200 ft. On either side of it, lay the mining towns of Orleans Flat and Woolsey's Flat, each about I mile apart. All three were settled around 1851 and their histories frequently intertwine. Collectively, they are sometimes referred to as "The Flats." All three were part of Eureka Township.
Orleans Flat was a historic mining town located on the San Juan Ridge about 20 miles northeast of Nevada City, California and about 5 miles northeast of North Bloomfield, California. The town was about 1 mile south of the Middle Yuba River at an elevation of about 4200 ft. To the west lay the mining towns of Moore's Flat and Woolsey's Flat, each about I mile apart. All three were settled around 1851 and their histories frequently intertwine. Collectively, they are sometimes referred to as "The Flats." All three were part of Eureka Township.
Snow Tent was a historic settlement in Nevada County, California. The name derives from a tent set up by the first resident in 1850. Snow Tent grew into a gold mining and lumbering center, then vanished sometime after 1880.
Alpha was a gold mining town in Nevada County, located about 2 miles southeast of the town of Washington, California and about 15 miles northeast of Nevada City, California. It lay at an elevation of 4120 feet, about 2 miles below the South Yuba River and just west of Scotchman Creek.
Blue Tent is a historic 19th century gold mining community located about six miles northeast of Nevada City, California.
Cherokee is a former gold mining community in Nevada County, California. As explained below, it has also been known as Patterson, Melrose and Tyler. It is located on the San Juan Ridge about 4 miles east of North San Juan. Its elevation is 2,516 ft (767 m) above sea level.
Little York is the name of one of the first gold mining towns established in Nevada County, California as well as the name of the township in which it was situated. The town was located on the Lowell Ridge between Steephollow Creek and the Bear River, about 13 miles east of Nevada City, California and about 1 mile southwest of Dutch Flat, California at an elevation of about 2800 feet.
The South Yuba Canal Office was the headquarters for the largest network of water flumes and ditches in California. It is located at 134 Main Street, Nevada City, California, USA.
Mooney Flat was an important mining and transportation hub in western Nevada County, California, just east of the Yuba County line. It was situated on modern Mooney Flat Road, about 1 mile north of modern Highway 20, at an elevation of about 800 ft.
Relief Hill is an unincorporated community in Nevada County, California. Relief Hill is located roughly midway between North Bloomfield and the town of Washington. It lies at an elevation of 3,947 feet. The post office established in 1894 was named Relief, and that name appears on some maps, especially those from around the turn of the nineteenth century. However, the town's inhabitants and most historians called it Relief Hill. The post office was discontinued in 1921.
Remington Hill is a historic mining camp in Nevada County, California which prospered in the second half of the 19th century. It was named for Caleb Remington, a prominent local miner who lived mostly in neighboring Little York, where he died in 1865. It lay at an elevation of 4052 feet. It was situated around present Chalk Bluff Road about one mile south of Highway 20 and about 5.5 miles southeast of the town of Washington and 6 miles northeast of Dutch Flat, as the crow flies.
Sebastopol was a historic mining community located on the San Juan Ridge, about 13 miles north of Nevada City. It lay midway between Sweetland and North San Juan, around the intersection of modern Sweetland and School Roads, at an elevation of about 2000 feet.
The case of Woodruff v. North Bloomfield Gravel Mining Company was a lawsuit brought to California courts in 1882 where a group of local farmers sued North Bloomfield Mining and Gravel Company over damages caused to farmland in the Central Valley. The farmers who brought the suit claimed that the company's hydraulic mining operations resulted in the disposal of excess sediment, debris, and chemicals in local rivers. Prosecutors argued that the debris raised river beds and restricted flow in the rivers leading to heavy man-made flooding. In the years prior, flooding of debris and chemicals had destroyed a large portion of the valley's agriculture.
