The mining operation here consists of channelling escaping volcanic gasses through networks of ceramic pipes from an active vent at the edge of the crater lake, resulting in the condensation of molten sulphur.
The deep red molten sulphur pours slowly from the end of the pipes into pools on the ground, turning into yellow cakes of sulphur after it cools. It is then broken into large pieces to be carried by labourers to a collection centre at the foot of the volcano.
These labourers trek over 5 km (3 miles) from the crater to a collection centre with loads weighing between 50 to 100 kg (110 - 220 lbs.) on their shoulders. Most of these labourers make this journey twice a day and are paid Rp. 600 ($0.06) per kg.
Around 13 tonnes of sulphur are extracted daily from the crater which are then used in sugar refineries, cosmetics, medicines and explosives.