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The Quicksilver Rush (ca. early 1930s) was a mining rush for cinnabar in southwest Arkansas and the Ozarks, mostly in Pike and Clark counties, beginning around 1931, in the early days of the Great Depression when people were desperate for jobs.
The patio process and later pan amalgamation process continued to create great demand for mercury to treat silver ores until the late 19th century. [48] Native mercury with cinnabar, Socrates mine, Sonoma County, California. Cinnabar sometimes alters to native mercury in the oxidized zone of mercury deposits.
The Guadalupe mine produced about 10% as much mercury as the New Almaden. There are several smaller mines in the mining district, but their ore production was not significant. The only significant quicksilver ore is cinnabar; other sulfides are present in small quantities. Mining, other than a single placer deposit of cinnabar, was underground.
Cinnabar generally occurs as a vein-filling mineral associated with volcanic activity and alkaline hot springs. The mineral resembles quartz in symmetry and it exhibits birefringence. Cinnabar has a mean refractive index near 3.2, a hardness between 2.0 and 2.5, and a specific gravity of approximately 8.1.
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Becker concluded the sulfur of Sulphur Bank was deposited after the cinnabar had been deposited, because he could find no evidence of acid farther than 20 feet (6.1 m) below the surface of the mine. He wrote the acid would have thrown the cinnabar down, instead of migrating up with the sulfur through the basalt rock which covered the mine site ...
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The New Idria Mining Company was formed soon after the discovery of cinnabar (quicksilver ore) in the southern Diablo Range of central California in 1854. The town of New Idria began around 1857 and about 300 men were employed at the mine by 1861.