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
Mining in Western Australia worlds supply, which is, however, only one percent of the mines overall production. Apart from Argyle, there is only one other operating diamond mine in the state, the Ellendale mine, located 100 km east of Derby, which opened in 2002. Ellendale produces the rare yellow diamonds. In 2009, sale volumes for diamonds fell by 44 percent while the value of the industry in the state decreased by 53 percent in comparison to 2008. Eighty percent of all salt produced in Australia comes from Western Australia. Of the state's production, 77 percent, in turn, originates from Dampier Salt Limited's operations at