The region is Indonesia's East Java volcano Kawah Ijen, 2, 6 km in height, topped by a large caldera (depression on top) and a lake of sulfuric acid a depth of 200 meters. This low activity inside the volcano crater emits gas evaporation, which the local miners used to earn a living. Evaporation retained on stone and ceramic tubes, which, as a result of condensed sulfur in a molten red liquid, then it flows down and is solidified in the form of pure sulfur. Miners knock frozen pieces with steel fittings. Thus they use a minimum of protection, despite the fact that during the stand extremely hazardous gases and liquids. Then the miners embark on the sulfur and carry it several kilometers to the weighing station. The load can weigh 45 to 90 kg, and one miner per day can not do more than two or three walker. At the end of a long day, the miners receive 50 thousand rupees ($ 5). Sulfur is then used for vulcanization of rubber, sugar decolorization and other industrial processes.
Indonesian miner carries sulfur from the volcano Ijen May 24, 2009 in the suburbs of Banyuwangi, East Java, Indonesia. (Ulet Ifansasti / Getty Images)
Filled with acid lake inside the crater Ijen volcano 200 meters deep and a kilometer wide. Picture taken May 24, 2009 in East Java, Indonesia. The lake is filled with a solution of sulfuric acid and hydrogen chloride at a temperature of 33 Sº. (Ulet Ifansasti / Getty Images)
A worker repairs the pipe, in which the sulfur gases are condensed. Ijen volcano complex May 24, 2009 in the suburbs of Banyuwangi, East Java, Indonesia. (Ulet Ifansasti / Getty Images)