Gahcho Kue Diamond Mine
The Gahcho Kué Diamond Mine is located on the Canadian tundra in the Northwest Territories. It is situated at Kennady Lake ( ), in the Akaitcho Treaty 8 Territory claim block, which is 85 km (53 mi) southeast of the Snap Lake Diamond Mine and approximately 280 km (170 mi) east northeast of Yellowknife. The site is served by Gahcho Kue Aerodrome, which has both an ice runway in winter and a year-round gravel runway, and a spur of the Tibbitt to Contwoyto Winter Road from Lupin Mine. the main camp is at , north of the ice strip, with a smaller site at , south of the runway.
The mine, which opened officially on 20 September 2016, consists of the Gahcho Kué kimberlite pipes, which lie underneath Kennady Lake. There are also several unexplored kimberlite occurrences scattered over several kilometres. 
In 1993, Canamera Geological began sampling and surveying the area for Mountain Province Mining Joint Venture (now Mountain Province Diamonds). Exploration began in the area with a camp being set up in 1995. In 1997, Monopros, now De Beers Canada, took over the camp when they joined the Mountain Province Mining Joint Venture. In 1998 De Beers began sampling the kimberlite to evaluate the four Gahcho Kué pipes. More drilling followed and the positive results led to the decision to proceed.
A project study was started in 2004. An evaluation program in 2006 was followed by a drilling and sampling program in 2007. In September 2009 a feasibility study on a proposed mine was started, which was completed in September 2010. De Beers and its partners approved it in June 2011 and are preparing a plan and budget for a final decision on whether to go ahead with the mine project. If it proceeds to an operating mine, is expected to annually mine 3,000,000 tonnes (3,000,000 long tons; 3,300,000 short tons) of kimberlite, and to produce 4,500,000 carats (900 kg) per year over an 11-year life.
In 2005, the Mackenzie Valley Environmental Impact Review Board (MVEIRB), after an initial environmental assessment, ruled that De Beers applications for a land use permit and water license would require a full Environment Impact Review. De Beers appealed this decision to the NWT Supreme Court, but was denied in April 2007, and the review process began in 2007. Due to economic factors, De Beers delayed filing the required Environment Impact Statement (EIS) to the review board and the review process was suspended in May 2010. De Beers gave notice in November and filed the EIS on 23 December 2010, and after some subsequent revisions to address a few deficiencies, the MVEIRB accepted it on 26 July 2011. Staff sessions began in November, and the panel's decision is expected by July 2013. Should it proceed after that, mine construction would take two years at a cost of around C$650–750 million.
Gahcho Kué is the traditional Chipewyan, a Dene people, name for the Kennady Lake area and in Dene Suline means "Place of the Big Rabbit". The area, also known for Barren-ground caribou, has been traditionally used by Dene from Łutselk'e and the Métis of Fort Resolution. In earlier times Tłı̨chǫ (Dogrib), also Dene, people used the area as well.
- Gahcho Kué Project Exploration Camp Project Description Archived 6 July 2011 at the Wayback Machine
- "Archived copy" (PDF). Archived from the original (PDF) on 9 July 2011. Retrieved 28 May 2009.CS1 maint: archived copy as title (link)
- Mountain Province Diamonds
- Gahcho Kué factsheet Archived 9 July 2011 at the Wayback Machine
- "About Gahcho Kue" Archived 19 September 2010 at the Wayback Machine, De Beers Canada website.
- De Beers EA – Final Submission to Public Registry