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In 1641, Samuel Winslow was granted the first patent in North America by the Massachusetts General Court for a new process for making salt. [ 1 ] [ 2 ] See also
Salt comes from two main sources: sea water, and the sodium chloride mineral halite (also known as rock salt). Rock salt occurs in vast beds of sedimentary evaporite minerals that result from the drying up of enclosed lakes, playas, and seas. Salt beds may be up to 350 metres (1,150 ft) thick and underlie broad areas.
Although Illinois was a free state, Crenshaw leased the salt works in nearby Equality, Illinois from the government, which permitted the use of slaves for the arduous labor of hauling and boiling brackish water to produce salt.
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Heads of families could purchase a half-bushel of salt for $2.50. If a widow had a son in the Confederate army, the price was only $1.00. But if the widow's husband had served his nation, the price was free. Local court clerks sent salt requests to the state government, which in turn allotted salt to the counties as requested. [4]
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Diorama of an underground salt mine in Germany. Inside Salina Veche, in Slănic, Prahova, Romania.The railing (lower middle) gives the viewer an idea of scale. Before the advent of the modern internal combustion engine and earth-moving equipment, mining salt was one of the most expensive and dangerous of operations because of rapid dehydration caused by constant contact with the salt (both in ...