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Diagras Project, NWT

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The Diagras Property consists of 23 contiguous claims staked by Arctic Star, with an area of 18,699 hectares. The property is in joint venture with Margaret Lake Diamonds whereby Margaret Lake has earned a 60% interest. The property is located in the north-eastern part of the prolific Lac de Gras kimberlite field, 22km NNE of the Diavik diamond mine and 36km east of the Ekati diamond mine in NWT Canada. The Company has verified through research and compilation that the property hosts over a dozen kimberlites, most of them diamondiferous. Arctic Star's research and compilation of historical data in the public domain confirms that Diagras is a property of merit that deserves additional exploration.

The Property is situated on a corridor of economic diamond deposits that include kimberlite pipes A-21, A418, A154S, A154N, A841, Lynx, Misery, Point Lake, and Jay. This corridor extends towards the Diagras Property and the Hardy Lake kimberlite cluster, which consists of 25 kimberlites. The closest economic kimberlite to the Diagras property is Jay, located 10 km SW, in the Buffer Zone joint venture between Dominion Diamonds Corp (64.3%) and Archon Minerals Ltd (34.7%). The Jay Project Pre-feasibility study (2015) reports a resources estimate of of 45.6 Mt with grade 1.9 Ct/t for 84.6 million carats. Jay will be a stand-alone open-pit operation that is expected to supply 4.3 dry metric tonnes per annum for 11 years beyond the current projected closure of the Ekati Diamond Mine. Construction is scheduled to commence in 2016.

Historical work on the Diagras Property dates back to 1992 when the area was known as the Hardy Lake Property. De Beers Canada Inc. (De Beers) discovered 25 kimberlites that range from 0.2--5 Ha in size on their Hardy Lake property. Nineteen bodies were tested for microdiamonds and 17 returned diamonds. Kimberlite descriptions from research papers indicate kimberlites of the Hardy Lake cluster have similar geology and geophysical signatures to other Lac de Gras kimberlites. Hardy Lake kimberlites sampled the same diamond-rich lithosphere as economic kimberlites at Lac de Gras, but an economic kimberlite has not yet been discovered in this cluster. De Beers added kimberlites Penelope, Petra and Hanna in 2003, which range in size from 1.8-3.5 Ha but did not disclose the locations of the 2003 discoveries.

Twelve Kimberlites are confirmed to occur on Arctic Star's Diagras Property from public records:
  KIMBERLITE NAME Details currently known.
1 Lyndsey No information available.
2 Hardy Lake HL-04 (TAZ) Magnetic low under lake, possibly HK
3 Dodi No information, near EM conductor in lake
4 Hardy Lake HL-02 VK, rVK, wood, EM, weak -ve MAG, >150m in size or twin pipe present to east
5 Kong W MAG low, altered HK, 22m intercept in -60 inclined core hole
6 Kong E MAG low, altered HK, few KIMs, 3 intercepts in -67 inclined core hole
7 Naomi No information available, pyrope KIMs down-ice
8 Nadine No information available, pyrope KIMs down-ice
9 Suzanne No information available
10 Black Spruce Recent gravity survey increased pipe size, significant diamonds
11 Jack Pine Large 5 Ha pipe, significant diamonds, excellent chemistry
12 Krista No information available

Majescor Resources Inc. (Majescor) optioned Hardy Lake from De Beers in September, 2004 and committed $10M in exploration work over 5 years, with annual minimum expenditure of $1M. The option lasted 28 months and $992,000 was spent on the property according to Majescor financial statements. Drilling totalled 764m, testing targets recommended by De Beers, including 2 core holes sampled the southern lobe of the Jack Pine kimberlite, and at least one more sampled Black Spruce which significantly increased the size of both kimberlites. During Majescor's exploration at Hardy Lake significant data, including diamond data that was confidential under De Beer's watch, became available. Majescor reported over ten drill-ready geophysical targets, but is believed to have drill tested only four.

Jack Pine is the largest kimberlite on the Diagras property with 500m north-south axis, and estimated surface area of 5 Ha. Majescor reports excellent mineral chemistry and significant diamond content at Jack Pine.
  Sample
Weight (kg)
Diamond Size (mm) Stones
Per 20 kg
1 0.5 0.3 0.212 0.15 0.104 0.074 -0.074 Total
Jack Pine 436.26 0 0 4 12 42 89 248 177 572 26
(Source: De Beers Canada from Majescor Resources News Release, March 30, 2005)

De Beers diamond results are not 43-101 compliant and do not conform to CIM diamond reporting standards. These results are considered relevant, as De Beers is an industry leader in diamond exploration and diamond mining.

In 2005 Majescor tested Jack Pine with two core holes and submitted 359.75 kg of kimberlite for microdiamond recovery.
  Sample
Weight (kg)
Diamond Sieve Size (mm) Total
Per 20 kg
0.425 0.300 0.212 0.150 0.106  
Jack Pine 359.75 2 6 25 80 186 299
(Source: Majescor Resources News Release, August 4, 2005, Processing by SRC)

Majescor results are CIM and 43-101 compliant, and were completed by Saskatchewan Research Council, which is an ISO accredited laboratory. The largest diamond recovered from Majescor's Jack Pine drill program measured 0.78 x 0.70 x 0.52 mm.

Majescor also reported "a large extension of the Black Spruce pipe" indicated by ground gravity geophysical surveys. Gravity surveys and other advanced geophysical techniques have discovered or increased tonnage previously known diamond-bearing kimberlites elsewhere in the Slave Craton.
  Sample
Weight (kg)
Diamond Sieve Size (mm) Total
Per 20 kg
0.425 0.300 0.212 0.150 0.106  
Black Spruce 167.15 0 2 2 3 7 14
(Source: Majescor Resources News Release, December 21, 2005, Processing by SRC)

Majescor, who acquired and reviewed De Beer's extensive dataset, reported 26 high interest areas defined by anomalous kimberlite indicator mineral samples and kimberlite float. Majescor reported "large, very prospective sectors of the property have been inadequately sampled" and "significant potential to find new pipes" (Majescor Resources, 2005 Annual Report). Majescor also reports that many De Beers discoveries are defined by only a single core hole.

De Beers collected 2,335 till samples (1000 were positive for KIMs), analysed 29,123 minerals, flew 16,709 line kilometers of airborne geophysics, completed 144 geophysical grids, and drilled 137 drill holes. About 65% of De Beers data was filed as assessment work, and has been acquired and compiled by Arctic Star, which forms a strong basis for future exploration.

De Beers operated from a 20-man camp located on Hardy Lake (removed 2010), which was located on the Tibbett-Contwoyto Winter road, which services mines in NWT and NU. The winter road is expected to be ploughed as far as the Jay kimberlite for decades to come, which will lower exploration costs at Diagras in future.