K19 pipe, a diatreme in the southwestern part of the Buffalo Head Hills kimberlite field in Northern Alberta, Canada
The Koidu Kimberlite Project mining lease, located within the Tankoro Chiefdom of the Kono District, measures approximately 4.9 km2 and hosts two small kimberlite pipes, No. 1 Pipe (K1) and No. 2 Pipe (K2), and four kimberlite dyke zones, along which four small blows or enlargements have been discovered.
Nearby is another kimberlite mine owned by Lucara Diamond, thought to have very large reserves of diamonds.
They found kimberlitic indicator minerals near Lac de Gras in the Northwest Territories in 1985, and their first kimberlite at Point Lake in 1991.
In addition to the type locality in Germany, it has been reported from Disko Island, Greenland; the Jharia coalfield, Jharkhand, India and as inclusions in diamonds in a number of kimberlite pipes.