This interesting warren of tunnels was mined in 1916, and then hidden by the miners. The mine was rediscovered when excavations for a dugout home punched through into the labyrinth of tunnels. As well as the great self-guided tunnel tours, there's a museum, a re-created 1920s underground home, and free mining-equipment demos daily (9.30am, 1.30pm and 3.30pm).
