The mine was part of a top-secret industrial project known as 'Kopalnia R-1', aimed at supplying uranium to the Soviet nuclear program.
The underground tunnels contain naturally occurring, vibrant purple and green fluorite deposits, which are rare in such concentrations.
Mining activities in this specific location were prematurely halted in 1953 due to the diminishing quality of the uranium ore deposits.
The tunnels feature 'dripping stones' and geological formations resulting from the mineral-rich groundwater filtration.
Radiation levels within the tourist route are monitored and documented as safe for public health, as confirmed by regulatory environmental reports.
Kopalnia Uranu Kletno is an underground tourist route located in the Śnieżnik Massif of the Eastern Sudetes, Poland. The facility spans a network of historical mining tunnels originally excavated by the Soviet Union between 1948 and 1953 for uranium extraction. The tour path extends approximately 400 meters, showcasing diverse geological features and remnants of secretive mining operations. Visitors can observe rare secondary uranium minerals, including yellow, green, and orange fluorite, as well as distinct colored ores within the rock strata. The tunnels maintain a consistent year-round microclimate, unaffected by external surface temperatures. The site functions as both a historical monument to Poland's post-war industrial era and a geological educational facility.
The central chamber where the mineral-rich ore veins are most visible and illuminated by exhibition lighting.
Bring a warm sweater or jacket, as the temperature inside the mine remains around 7 degrees Celsius regardless of the weather outside.
Wear sturdy, closed-toe walking shoes with non-slip soles, as the ground inside the tunnels can be damp or uneven.
Consult the official website shortly before arrival to verify if the site is operational during extreme weather conditions.
Do not attempt to stray from the guided tour group or enter blocked-off side tunnels for safety reasons.
Operating schedules may change based on the season; generally open daily during summer months, but may have reduced hours or closures on select weekdays during the off-season.
Do not touch the mineral formations or walls to preserve the geological state; stay within marked pathways and follow the guide's instructions at all times.
