Argyle diamond mine at the Ekati mine, both in Canada. However, Argyle has two to four times the concentration of diamonds (ore grade) of these mines. This makes extraction economically feasible, as mine costs are mostly related to the amount of ore processed, not the amount of diamond extracted. In 2005, Rio Tinto was given the go-ahead to a future expansion project, moving it from an open pit to an underground mine. This plan was postponed; in September 2010 Rio Tinto announced fresh plans to develop an underground mine beneath the existing pit, increasing annual production to 9 million tonnes of ore. The
Cempaka diamond mine by LSE-listed Gem Diamonds, started mining operations there in 2005, and in a year had uncovered 50,000 carats of "gem quality" diamonds, it said in a statement. The hundreds hoping for fortune at Indonesia's largest diamond mine http://mashable.com/2015/11/09/campaka-indonesia-diamond-mine/#5XrLagnkdEqk Cempaka diamond mine The Cempaka mine is one of the largest diamond mines in Indonesia and in the world. The mine is located in South Kalimantan, Borneo. The mine has estimated reserves of 32.9 million carats of diamonds. The hundreds hoping for fortune at Indonesia's largest diamond mine 1.2k Share Tweet BY VICTORIA HOSingapore Nov 09, 2015 For the 500 or so