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salt well
A salt well (or brine well) is used to mine salt from subterranean caverns or deposits. Water is used as a solution to dissolve the salt or halite deposits so that they can be extracted by pipe to an evaporation process, which results in a brine or dry product for sale or use. In the United States during the 19th century, salt wells were a significant source of income for operators and the government. Locating underground salt deposits was usually based on locations of existing salt springs.
In mountainous areas, a similar technique called sink works (from German ''sinkwerk'') is used.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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