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Reference.org
Sicilian method
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<p>The Sicilian method was one of the first ways to extract <a href="/facts/Sulfur/IK0amTfM">sulfur</a> from underground deposits. In its most basic form the ores were piled in a mound and ignited. The semi-pure sulfur flowed down and the solidified mass was collected at a lower level. It was the only industrial method of recovering sulfur from elemental deposits until replaced by the <a href="/facts/Frasch_process/47C7d6CU">Frasch process</a>. Most of the world's sulfur was obtained this way until the late 19th century. </p>