Location: Lac de Gras, Northwest Territories - 290 km northeast of Yellowknife
Size: 125,000 hectares
Ownership: 45% North Arrow (Dominion working to earn their 55% interest)
Stage: till sampling and geophysics; drill target generation
Closest Infrastructure: Diavik diamond mine 10 km to northeast; Ekati mine located 20 km north; ice road comes through property boundary
The Lac de Gras Project is located in the Lac de Gras kimberlite field, close to two of the world’s richest diamond mines: Diavik and Ekati. North Arrow considers the area to have significant exploration potential for the discovery of new diamondiferous kimberlites. Exploration of the project is conducted under an option and joint venture agreement with Dominion Diamond Corporation under which Dominion is working to earn a 55% interest in the project by funding $5M of exploration over a 5 year period. Dominion is the most important diamond company in the NWT, owning an interest in both the Diavik (40%) and Ekati (80%) mines.
Previous work in the project area has included airborne surveys, till sampling, ground geophysics and limited diamond drilling. Untested geophysical anomalies and unexplained geochemical anomalies remain, but the glacial history of the project area south of Lac de Gras is considered to be complex, having been exposed to multiple glacial events. In 2013, Dominion conducted an extensive program of reverse circulation overburden drilling intended fully evaluate basal tills for kimberlite indicator minerals.
The 2013 program consisted of a two phase overburden drilling program.. The initial phase one program consisted of 562 drill holes on a nominal 3 km by 1 km grid. A total of 1,309 heavy mineral till samples were collected and initial mineral picking results have been received for 1,208 of the samples. The recently completed phase two program consisted of an additional 195 overburden drill holes (395 samples) drilled at 250 m intervals along variably spaced lines intended to further evaluate several target areas identified from historic data and initial phase one program results. Several of these targets fall along the southern extension of a trendline defined by the Diavik mine kimberlites.
The 2013 exploration program was managed by Aurora Geosciences Ltd. of Yellowknife, NT and till samples were processed at Overburden Drilling Management Limited of Ottawa, ON. A follow up exploration program is anticipated for 2014.