Word: frasch
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Dates: during 1950-1959
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What makes Mexico's sulphur doubly attractive is the fact that the deposits are located in gigantic salt domes, which can be mined by the Frasch process, the cheapest method known. (Superheated water is pumped into the ground to liquefy the sulphur, which is then pumped to the surface.) Costs range from $7 to $20 per ton, as low as one-tenth the cost of other methods, and far cheaper than the world market price...