The Minister of Lands of the Government of the Northwest Territories (GNWT) has accepted the recommendations of the Mackenzie Valley Environmental Impact Review Board (MVEIRB), that Dominion Diamond's Jay Project be approved, subject to the measures described in the Report of Environmental Assessment. At issue were the potential environmental impacts of Dominion Diamond’s proposed expansion of the Ekati diamond mine in Yellowknife, in Canada's NWT. The proposal, dubbed the Jay pipe, is located near Ekati’s existing Misery pit. The Jay pipe is the largest known diamond deposit in North America, according to Dominion. Dominion believes opening up Jay – by building a dyke, draining part of a lake and digging an open pit – will keep the mine open for an additional 10 years, to 2030. Aboriginal groups worry about the effects of the expansion on the region’s caribou herds, but the company has promised it would make every reasonable concession to caribou, including a “road mitigation plan” designed to reduce the risk caribou face from the mining operation.