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method of mining deep-lying sulfur invented by the German-born American chemist Herman Frasch. The process involves superheating water to about 170 C (340 F) and forcing it into the deposit in order to melt the sulfur (melting point of about 115 C, or 240 F), which is lifted to the surface by means of compressed air. The mixture of sulfur and water is then discharged into bins, where the 99 percent pure sulfur is allowed to solidify.