Exploration

Geology

The Kennady Lake kimberlite cluster is in the southeast Slave Craton. The area was glaciated repeatedly during the Pleistocene, most recently by the Laurentide ice sheet. The Laurentide ice sheet began to recede about 18,000 years ago and the ice retreated past the Kennady Lake project area between 9,000 and 9,500 years ago. Four main pipes comprise the Kennady Lake kimberlite cluster - 5034, Hearne, Tuzo and Telsa. The 5034 kimberlite is an irregular hypabyssal root zone. Hearne and Tesla are transitional diatremes and root zones. Tuzo is the deeper part of a diatremes zone.

At present, Telsa is not included in the Gahcho Kué mineable resource because of its smaller size (0.4 ha). However, it may be exploited towards the end of the project life. The shapes and internal geology of each of the kimberlite pipes has been based on the logging of the available drill core. The external shapes and internal geology of each body was modeled in three dimensions using GEMCOM. Both internal and external models were updated after drilling programs conducted between 2001 and 2011. All the pipes remain open to depth.

Wilson Kimberlite

Plan view of the Wilson kimberlite. Inset shows the location relative to other kimberlites in the Gahcho Kué JV area. The planned open-pit mine pit shells are shown in pale gray.

 

Preliminary cross-sectional image of the Wilson kimberlite in green, looking east from Tuzo. Drill traces are as black lines. Lake surface and bottom sediments are outlined in brown. The proposed open pit profile for the Tuzo kimberlite is in gray. Elevations are in meters above sea level. Not all drill traces are shown. Drilling to date shows no connection to the nearby Tuzo kimberlite, and the Wilson kimberlite remains open to the north.