History
Beginning in 1856, the mine was first worked for borax. Mining for sulfur began in 1865, and produced 2,000,000 pounds (909,090 kg) in four years. Mercury ore was mined intermittently by underground and open-pit methods from 1873 to 1957. Sulphur Bank Mine was credited with a total output of 92,400 flasks (7.02 million pounds) by 1918. The mine was an important producer during both world wars.
The mine closed in 1957 and is a California Historical Landmark (#428). Sulphur Bank Mine became an Environmental Protection Agency (EPA) superfund site in 1990.
Read more about this topic: Sulphur Bank Mine
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—Henry David Thoreau (1817–1862)