The mine shafts measure 4.5 kilometres (2.8 mi) in length at about 330–468 metres (1,083–1,535 ft) in depth below the surface, at 16 levels.

It runs from the east to the west of the mine, connecting in a straight line the bottom ends of the Campi and Sutoris shafts.

The August Passage was initially called the Long Stove (Polish: Piec Długi).

Its first part, extending between the Rabsztyn Chute and a Campi Shaft, was built from 1723 to 1743, in accordance with a design by Jan Gottfried Borlach.

Excavated chambers, shafts and passages form an underground town, which is open to sightseers.

The Ważyn chamber has a specific microclimate, with a constant temperature between 14–16 °C (57–61 °F), high humidity (about 70%) and favourable ionisation of the air saturated by sodium chloride and valuable microelements, like magnesium, manganese and calcium.