The La Grange Mine is a former mine located in Trinity County, California. At one time it was the largest hydraulic mine in California. Started operating in 1862, over 3,500,000 dollars of gold was extracted before it was closed down in 1918 due to rising costs of labor and steel after World War I. The quality of gold was low so hydraulic mining was used to take it from the ground. The site is now a California Historical Landmark.