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The Diavik Diamond Mine in the NWT of Canada (Fig. 1A, B) has produced in excess of 100 million carats from 3 kimberlite pipes since mining commenced in 2002, and geology work to support mining has generated new insights into the nature of kimberlite pipes at Lac de Gras to depths >700 m below surface. Here, we present new findings from deep (>400 m below surface) mining, sampling and drilling work on the A154N kimberlite volcano. The drilling and mining has revealed additional geological domains, and contact relationships apparent among the eight domains (Dueys, PK1-N, VRVK-1N, PK2-N, PK3-N, MRVK2-N, PK4-N, CK-N) allow for a sequential organization of emplacement events. Updated 3D internal geological models and pipe shapes for A154N are also presented which expand upon understandings of Lac de Gras kimberlite pipe morphology.

Kimberlite emplacement and mantle sampling through time at A154N kimberlite volcano, Diavik diamond mine