Mountain Province Diamonds is a Canadian diamond mining company headquartered in Toronto, Ontario. In joint venture with De Beers, Mountain Province operates the world's largest and richest new diamond mine—Gahcho Kué—located in Canada's Northwest Territories.

Mountain Province Diamonds and De Beers Canada are joint venture partners in the Gahcho Kué mine in Canada’s Northwest Territories. Gahcho Kué is the world's largest new diamond mine. Through its joint venture with De Beers, the Company is well placed to capitalize from the experience of the world's leading international diamond producer. The Gahcho Kué mine is located in Canada, the third largest and politically most stable diamond producing country. Gahcho Kué is projected to produce an average of 4.5 million carats a year (100%) over an initial 12 year life. Production during the first five years (2017-2021) is expected to average 5.4 million carats a year (100%). Mountain Province intends to maximize shareholder value through the optimal operation of the Gahcho Kué mine.