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 certain covenants of their investment agreement, but is working with Shear to find funding or a purchaser. The mine was developed, opened and operated by Tahera Diamond Corporation. The company was provided with CAN $35 million loan by Tiffany & Co. to assist in construction of the site, as part of a marketing alliance. The mine produced diamonds from 2006 to February 2008, and was Tahera's only mining operation. The company reported financial losses in 2007 due to operational difficulties, the high value of the Canadian dollar, high oil prices, and the short operating season of the Tibbitt to