Štola Jan Evangelista, Mining adit in Jiřetín pod Jedlovou, Czech Republic

Štola Jan Evangelista is a silver-mining adit on the northwest slope of Křížová hora near Jiřetín pod Jedlovou. Founded in 1781, its passage runs 460 metres, with 640 metres of galleries in total, cut through 650-million-year-old phyllitic greywacke. A 360-metre section has been open to visitors since 7 August 1999 and includes the 16th-century Kryštof adit.

The adit was founded in 1781 and linked to other galleries in the area; four adits and one shaft are known at Jiřetín pod Jedlovou, with 800 m of known passages in all. Mining of silver-bearing galena and chalcopyrite on calcite and quartz-calcite veins ended in the first half of the 17th century, also because of plague and the Thirty Years' War. Work resumed at the end of the 18th century, and the last attempts to renew extraction ran from 1890 to 1910.

The adit is named after Saint John the Evangelist, and the neighbouring Kryštof gallery, from the first half of the 16th century, is named after Saint Christopher. Since 1998 a mining museum has occupied the former parish house in Jiřetín pod Jedlovou, and the local graphic artist and photographer Jiří Stejskal designed the tickets for the adit, the museum and nearby sites such as the Jedlová lookout tower and Tolštejn castle.

Access to the adit is seasonal and depends on weather and visitor management schedules. Wear sturdy footwear and bring warm clothing since underground conditions stay cool throughout the year.

The adit was first opened to the public on 1 May 1935 by the Jiřetín pod Jedlovou tourist association, then closed at the end of World War II; in the mid-1970s the entrance was blown up because of its unstable condition. A survey in 1989 found the passages almost unchanged, and a new entrance was built in 1992.