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
Women in the military by country forces with the creation of the Army Nursing Service in 1899. On the 30th of June 2017, women were found to make up 16.5% of the Australian Defence Force (with 20.6% in the Royal Australian Air Force, 20.4% in the Royal Australian Navy and 13.2% in the Australian Army). However, up until 2016, only 74% of the total number of available roles in the Australian armed forces were available to women. Despite this, using 1998-99 figures, the ADF had the highest percentage of women in its employ in the world. In 1998, Australia became the fourth nation in the world