The caves were frequently vandalised during the nineteenth century until 1884, when they were declared a natural reserve. Organised tours of Cathedral Cave began about 1885 with the appointment of the first caretaker, James Sibbald. Gaden Cave was discovered in 1902 and developed in 1909. The Phosphate Mine was in production from 1914 to 1918 however only 6000 tons of rock with limited amounts of phosphate were removed. The mine passages, mostly backfilled and collapsed, lay dormant for almost 80 years until they were reconstructed and reopened for tours in 1996. Cathedral Cave, Gaden Cave and the Phosphate Mine are shown as guided tours.