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Which countries continued to use the Frasch process for sulfur production?

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A labeled diagram highlights sulfur's position on the periodic table, showing its atomic number 16, symbol S, atomic weight range, electron configuration, and classification as a solid, strongly acidic, orthorhombic nonmetal at room temperature. — sulfur Chemical properties of sulfur.

The Frasch process is a method used to mine deep-lying sulfur by injecting superheated water into deposits to melt the element, which is then pumped to the surface using compressed air. While this technique was once the dominant source of global sulfur production, it has largely been superseded by sulfur recovered as a by-product of oil and natural gas refining.12

Currently, the Frasch process remains in use in Poland and Russia.2