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
Jericho Diamond Mine On July 19, 2010 Shear Diamonds (née Shear Minerals Ltd) (), a diamond exploration company focused on the Nunavut region, announced its purchase of the Jericho Diamond Mine. In late 2010, Shear announced that it would take about a year to devise a plan to reopen the mine. Shear began processing the existing recovery reject pile in early 2012, selling the recovered stones to Belgian diamond firm Taché, which provided a revolving line of credit. However, operations were suspended in September, as Shear, citing "limited funds and significant operations", has sought to minimize expenditures. Taché has given notice of default