Arctic Star Diamond Corp.
TSX VENTURE : ADD

Arctic Star Diamond Corp.
Tres-Or Resources Ltd.
TSX VENTURE : TRS

Tres-Or Resources Ltd.

May 15, 2006 09:30 ET

Tres-Or Resources Ltd. and Arctic Star Diamond Corp.: Diamond Results and Further Bulk Testing Recommended for the Lapointe Kimberlite, Ontario

VANCOUVER, BRITISH COLUMBIA--(CCNMatthews - May 15, 2006) - Tres-Or Resources Ltd. ("Tres-Or") (TSX VENTURE:TRS) and partner Arctic Star Diamond Corp. ("Arctic Star") (TSX VENTURE:ADD) are pleased to report caustic fusion tests to date on the large (+ 21 hectare) Lapointe Kimberlite pipe in Ontario have yielded 440 stones from 3687 kilograms (kg) of kimberlite. The largest recovered diamond weighs 0.0665 carats, and remained on a 1.7mm screen. Six other diamonds weigh between 0.0024 and 0.0100 carats. From the reported results 5 stones are greater than or equal to 1.0mm in at least one measured dimension, 50 diamonds are greater than or equal to 0.5mm in at least 1 dimension, and 14 diamonds are greater than or equal to 0.5mm in 2 measured dimensions. The total weight of diamond recovered is 0.147 carats. For photos of the diamonds please visit www.tres-or.com.

Before testing, the core was 1/2 split and logged, with one half split being bagged into 8 kg batches, and the 2nd half split being retained for further geological examination, and replicate sampling where warranted. Large crustal xenoliths were excluded from processing. The fully diluted weight for the tested drill interval is 4236 kg, with much of the dilution occurring near the northern pipe contact.

The caustic tests were conducted at 3 independent Canadian laboratories (Saskatchewan Research Council (SRC), SGS-Lakefield Research Limited, and Thunder Bay Diamond Laboratory), using bottom screen sizes of 0.150 mm or 0.106 mm. More than 95% of the samples were processed at SRC, using the 0.106 mm bottom screen size. Each of the labs returned at least some microdiamonds. The total caustic results are tabulated by sieve size and are reported below (Table 1):



Table 1: Cumulative caustic fusion for the Lapointe Kimberlite
presented by sieve size.

---------------------------------------------------
Lapointe Kimberlite Pipe - Caustic Sample Results
---------------------------------------------------
Fully
Screen size Undiluted diluted
opening #diamonds Kimberlite Kimberlite
(mm) recovered weight (kg) weight (kg)
---------------------------------------------------
---------------------------------------------------
1.700 mm 1
1.180 mm -
0.850 mm -
0.600 mm 6
0.425 mm 10
0.300 mm 31
0.212 mm 66 3687 kg 4236 kg
0.150 mm 151
0.106 mm 175
---------
440
---------------------------------------------------
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TRES-OR RESOURCES LTD.

The results tabulated above in Table 1 include selective replicate testing of the highest diamond count phase from the deep central part of the pipe. This replicate sampling used the 2nd half split of core, and recovered 0.025 carats of diamonds from 36.5 kg of kimberlite (see news release dated March 6, 2006).

More than 95% of the recovered diamonds, both by count and weight, are sourced from the centralwestern portion of pipe, which accounts for less than half the total weight of kimberlite tested. This area of potential diamond concentration is estimated to be between 4 to 10 hectares, and currently does not correlate to any individual kimberlite phase identified in the drill core to date. Further testing of larger sample sizes is required to confirm and define this area within the multi-phase pipe. The large size of the Lapointe Kimberlite, plus expected low mine construction and operating costs in the area, suggest further testing may be warranted to define economic potential.

Initial work recommendations require the collection of a least 10 to 20 tonnes of kimberlite for diamond processing. Different methods to obtain this initial sample size to test and the costs of collection and methods of processing are being examined currently. This initial testing of a larger sample would provide confidence to assess further work recommendations.

Concurrently with evaluating the collection of a larger sample at the Lapointe discovery, Tres-Or is continuing to explore other priority magnetic targets in the Temagami North Expansion area in partnership with Arctic Star, and on 100%-owned Tres-Or properties in northwestern Quebec and the Temagami/Timiskaming area of northeastern Ontario.

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

Forward-Looking Statements

This news release contains discussion of items that may constitute forward-looking statements within the meaning of the securities laws that involves the risks and uncertainties. Although the Company believes the expectations reflected in such forward-looking statements are based on reasonable assumptions, it can give no assurances that its expectations will be achieved. Factors that could cause actual results to differ materially from expectations include the effects of general economic conditions, actions by the government authorities, uncertainties associated with contract negotiations, additional financing requirements, market acceptance of the Company's products and competitive pressures. These factors and others are more fully discussed in the Company filings with the securities regulatory authorities.

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

Laura Lee Duffett, President

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

Patrick Power, 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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