Crater lake located at 2,148 m above sea level and surrounded by a volcanic crater . Ventilation is a source of sulfur , making a trip to the crater and into the lake every day becomes more challenging . Sulfur collector climb in the morning and return around 1:00 when the misty clouds . They carry baskets of pure sulfur mine on the edge of a lake in the shadow of the thin walls of the crater . Minerals in the crater is pure and valuable commercial exploitation despite the horrendous labor involved : Javas homegrown sulfur is a natural source of sulfuric acid , interested in the business of oil refining and fertilizer production
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