Sulphur Bank Mine
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Sulphur Bank Mine, located in Clearlake Oaks, California was a sulphur mine that also became one of the most noted quicksilver producers in world. First worked for sulphur in 1865, in four years it produced a total of 2,000,000 pounds (909,090 kg). Reopened and developed for quicksilver in 1873, it is credited with total output of 92,400 flasks, and was an important producer in World War I and World War II.
The mine is now a California Historical Landmark (#428).