Arctic Star Diamond Corp.
TSX VENTURE : ADD

Arctic Star Diamond Corp.

July 20, 2005 15:17 ET

Arctic Star and Tres-Or Report on Preliminary Diamond Results from the Lapointe Kimberlite Discovery, Ontario

VANCOUVER, BRITISH COLUMBIA--(CCNMatthews - July 20, 2005) - Arctic Star Diamond Corp. ("Arctic Star") (TSX VENTURE:ADD) and Tres-Or Resources Limited ("Tres-Or") (TSX VENTURE:TRS) are pleased to report that micro- and macro-diamonds were recovered from caustic fusion analyses of the Lapointe Kimberlite discovery. The kimberlite was tested by caustic fusion at two accredited laboratories: 1) the Thunder Bay Diamond Laboratory in Thunder Bay, Ontario, Canada; and 2) SGS-Lakefield Research Limited in Lakefield Ontario. Half split core was collected into 8 kg samples, with alternative samples sent to each lab, in order to both speed up the sample processing, and to test replication between labs. A total of 193.3 kg were processed by Thunder Bay Diamond Laboratories, which recovered 20 diamonds. The largest diamond remained on a 1.7 mm screen and is described as clear and white, and weighs 0.0665 carats. The remaining diamonds from Thunder Bay include 5 fragments greater than 0.5 mm in one dimension, which suggests that the Lapointe Kimberlite has an encouraging coarse diamond size distribution (refer to Table 1). SGS-Lakefield reported a single micro-diamond which remained on the +212 micron screen from 198.5 kg.

Table 1. Total number of stones remaining on square meshed screens of specified sizes in microns (1000 microns equals 1 mm) from the caustic fusion tests of 391.8 kg of Lapointe Kimberlite.



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Sieve size (microns) # of microdiamonds recovered
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+ 1700 1
+ 1180 0
+ 850 0
+ 600 0
+ 425 0
+ 300 2
+ 212 7
+ 150 11
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The Lapointe Kimberlite was discovered on May 18, 2005 within the first hole drilled by Tres-Or as part of an option agreement with Arctic Star, under which Arctic Star can earn a 50% interest in certain of Tres-Or's Temagami North Expansion properties. The Lapointe Kimberlite is a large kimberlite, based on the first 4 drill holes which support the kimberlite pipe covering approximately 20 hectares at surface, as originally inferred from proprietary airborne geophysical data.

The remaining split core from the initial Lapointe Kimberlite drilling is at the lab, and results are pending.

Harrison Cookenboo, Ph.D., P.Geo., a Qualified Person by the standards of National Instrument 43-101 has been responsible for the design and the implementation of the field program. Dr. Cookenboo has reviewed the results obtained to date and has approved the contents of this news release. Tres-Or is the project operator.

ON BEHALF OF THE BOARD OF DIRECTORS OF ARCTIC STAR DIAMOND CORP.

Patrick Power, President

ON BEHALF OF THE BOARD OF DIRECTORS OF TRES-OR RESOURCES LTD.

Laura Lee Duffett, President

The TSX Venture Exchange has not reviewed and does not accept responsibility for the adequacy or accuracy of this release.

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