The name of the adit is derived from trout that used to live there and at dark light seemed to be black. The adit is a 600-meter long section between two shafts: “Ewa” and “Sylwester”. “Ewa” shaft, which is 20 meters deep, was built 184 years ago. Its shaft top, constructed in the form of a characteristic rotunda, is a preserved stylish form for this type of mining buildings. “Sylwester” shaft, like “Ewa” shaft, was constructed 2 years later and its depth is 30 meters. A visit to the “Black Trout” adit is made on boats whose harbour is in the pit bottom of “Ewa” shaft. During the visit we can see the side walls of the rocks where vertical grooves are visible - these are the traces of blast-holes. We can also meet bats in the adit, which has recently become their bedroom.