Earlier this month, Mountain Province Diamonds (TSX-MPV, AMEX-MDM) dropped a big rock in the otherwise stagnant waters of diamond exploration and investment. The company announced that they had recovered a 25.13 c colourless octahedral diamond of exceptional clarity from the Tuzo kimberlite in the Gahcho Kue cluster, Northwest Territories. This diamond was valued at approximately (USD) $17,500/c, or $439,775 total. This is the largest diamond recovered in Canada during an exploration project. 


MPV discovered the Gahcho Kue cluster, which lies in the AK property in the Kennady Lake region. It owns 49% of the project, with De Beers Canada as the operator and majority stake holder. The geologic environment of the project is in the southeast Slave craton. The cluster was discovered in 1997 and DeBeers Canada (then Monopros) was quickly brought in as a JV partner where is could earn up to 51% of the project by shouldering a large portion of the costs. DeBeers has since exercised this option. Four main kimberlite bodies comprise the cluster (see map): Tuzo, 5034, Hearne, and Tesla. Tesla is not currently considered to be a resource as its small surface area, 0.4 hectares, is less than one third that of the next largest body: Tuzo at 1.4 hectares.


The geology of the three currently economic pipes is varied. 5034 is an irregular body of hypabyssal kimberlite, Hearne is a mix of hypabyssal and diatreme facies kimberlite, and Tuzo is believed to be the deeper part of a diatreme with no root zone found as of yet. These bodies together create a large reserve of ore that has been thoroughly drilled and modeled over the past decade. In a general way the geology could be seen as an intermediate between the Churchill (Stornoway Diamonds & Shear Minerals) and Snap Lake (De Beers Canada) projects that are entirely hypabyssal kimberlite and the Fort a la Corne (Shore Gold & Newmont) project where all of the kimberlite found is pyroclastic or resedimented pyroclastic.


The diamond was recovered from LDDH sampling in March of this year. After the sampling was completed the kimberlite was made into a concentrate at De Beers’ Grand Prairie, Alberta facility and then shipped to the GEMDL laboratory in South Africa (also run by De Beers) to recover the remaining diamonds....

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