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The Lac de Gras kimberlite field is a group of Late Cretaceous to Eocene age diatremes in the Northwest Territories, Canada.
The Eocene (ca. 55-50 Ma) age diatremes of the Lac de Gras kimberlite field support two world-class diamond mines called Ekati and Diavik. Ekati, Canada's first diamond mine, has produced 40,000,000 carats (8,000 kg) of diamonds out of six open pits between 1998 and 2008, while Diavik to the southeast has produced 35,400,000 carats (7,080 kg) of diamonds since its foundation in 2003.
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Lac de Gras kimberlite field Wikipedia(Text) CC BY-SA