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Saltpetre (Potassium nitrate) mine
With the help of bat dung in the cave, dirt is put in bins like this and with water the minerals are leeched out forming saltpetre which is used in gunpowder. When it is all leeched out, fresh cave dirt is put in. This where the term "petered out" comes from.

Saltpetre (Potassium nitrate) mine

With the help of bat dung in the cave, dirt is put in bins like this and with water the minerals are leeched out forming saltpetre which is used in gunpowder. When it is all leeched out, fresh cave dirt is put in. This where the term "petered out" comes from.