Sink works

Sink works or sinkworks (from German Sinkwerke) is a method of salt mining from salt deposits in mountainous areas.

It is similar to brine wells in that salt was extracted by dissolving it in water.

Both approaches simulate natural brine springs.

[4] This method is common in most salt mines in Alps, where the saltrock-mudrock-tectonite known as Haselgebirge is widespread, with average halite content of 30-65%.

[5] In industrial cases, a complex structure of underground chambers interconnected by tunnels is created.