Argyle diamond mine of tunnelling, the Argyle underground block cave development was officially completed. In 2013, Argyle is estimated to produce 10.2 million carats with an average per carat price of $25/carat. The Argyle diamond mine is also notable for being the first successful commercial diamond mine exploiting a volcanic pipe of lamproite, rather than the more usual kimberlite pipe; much earlier attempts to mine diamonds from a lamproite pipe in Arkansas, USA were commercially unsuccessful. The Argyle mine is owned by the Rio Tinto Group, a diversified mining company which also owns the Diavik Diamond Mine in Canada and the Murowa Diamond
Historic Silver Mine in Tarnowskie Góry Adit, part of the Deep Adit Fryderyk, was the first to be exploited for tourism. In 1957, it was opened as a 600 metre long boat tour. The Historic silver mine opened in 1976. The visit in Historic Silver Mines starts in a interactive museum where tourists get the knowledge of methods of silver, lead and zinc ore extraction as well as underground mine drainage. Then tourists go underground. The trail is 1,749 meters long; 270 meters are travelled by boats. Outside the buildings of Historic Silver Mine there is an Open Air Steam Engine Museum. The new attraction of