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
Charles E. Fipke a heavy mineral and diamond exploration research laboratory. In 1983, he founded Dia Met Minerals, which became listed on the Vancouver Stock Exchange in 1984. Dia Met was sold to BHP Billiton in 2001. In 1988, Fipke and partner Stu Blusson began a systematic search for diamonds in the Northwest Territories, leading to the discovery of the first diamond pipe in North America in November 1991 near Lac de Gras. The Ekati Diamond Mine is now located there. Fipke maintained a 10% interest in Ekati until 2014, when he sold his share to Dominion Diamond Corp. for . "I'm not