Fort À La Corne Kimberlites Orion North Kimberlites: Technical Update

• The partially evaluated Orion North kimberlites (K147/K148, K120 and K220) are estimated to contain more than 500 million tonnes of diamond bearing kimberlite (News Release Mar 06, 2014).
• Initial diamond parcels recovered from large diameter drill ("LDD)") samples from Orion North kimberlites K120, K147/K148, all contain diamonds over one carat, including two high value stones of 7.50 and 6.88 carats, respectively. The presence of these large, high-quality diamonds points to the potential for coarse diamond size frequency distributions for the Orion North kimberlites.
• The Orion North kimberlites have significantly elevated proportions of Type IIa diamonds, particularly K147/K148, which has 52 percent Type IIa diamonds in the size range from 0.05 to 7.00 carats.
• Rio Tinto Exploration Canada Inc. ("RTEC") conducted extensive exploration work between 2017 and 2022 to prioritize the Fort à la Corne kimberlites outside of Star and Orion South. This work, using the latest exploration techniques, enabled them to conclude that Orion North is the target for further exploration and evaluation.

The Target for Further Exploration ("TFFE") estimated for the significant economic kimberlite units with Orion North is estimated to include between 511 and 609 million tonnes of kimberlite containing some 25 and 50 million carats of diamonds. The TFFE is conceptual in nature and is not a Mineral Resource and it is uncertain whether further exploration work will result in the TFFE being delineated as a Mineral Resource. The details of the TFFE estimates for the individual kimberlites are listed in Table 1 below.

Table 1. TFFE Summary Table for Orion North

The TFFE has been calculated using macrodiamond results from existing LDD holes and incorporates the average LDD grade adjustment factors used in previous evaluations of the Star and Orion South Kimberlites. The TFFE calculation procedures were found to reproduce the existing Star and Orion South Resource models to well within the variance envelope of the underlying data sets and the errors inherent in the estimation procedures employed. The details of the evaluation data for the kimberlites included in the TFFE are included in Table 2 below.

Table 2. Drilling Statistics for Kimberlites included in the TFFE

These TFFE tonnage and carat estimates confirm that the initial sampling already conducted on Orion North justifies further exploration and evaluation and Orion North is a potential target for future Trench Cutter ("TC") bulk sampling. Significant drilling has been completed over time on the Orion North kimberlites and the details of these drill programs to date are documented in Table 3 below and the Detailed Map.

Table 3. Orion North Drill Program Details

Orion North: Coarse Diamond Size Frequency Distribution

LDD mini-bulk samples from Orion North K120 and K147/K148 have yielded a significant number of diamonds 0.9 carat and above (Table 4). The elevated proportion of these larger diamonds in LDD mini-bulk samples is anomalous and speaks to the potential for a coarse diamond size frequency distribution in these Orion North kimberlites.

Table 4. Orion North Diamond Statistics for LDD Mini-bulk Samples

Orion North: Significant Proportions of Type IIa Diamonds

Type IIa diamonds are very rare and account for less than 2 percent of all natural rough diamonds mined from kimberlites. Only a small number of active diamond mines regularly produce Type IIa diamonds with the most important of these mines being Letseng-la-Terae (Letseng Mine) in the Kingdom of Lesotho and more recently Karowe in Botswana. While Letseng is a low grade (1.5-3 cpht) kimberlite and Karowe approximately (15 cpht), they are probably the most prolific source of large high-value Type IIa diamonds, which contribute to making Letseng and Karowe highly economic deposits. The number and the percentage of Type IIa diamonds for the major EJF units at Orion North are documented in Table 5 below. As shown in Table 5, the 10.8 percent proportion of Type IIa diamonds in K120 is significantly elevated, the 52.1 percent Type IIa proportion in K147/K148 is uniquely high and suggests that K147/K148 has the potential to host many large diamonds.

Table 5. Orion North Kimberlite (Diamonds +7 DTC (0.05 carats) to 7 carats)

The largest stones from the EJF in each kimberlite, both of which are also the highest value stones, are listed in Table 6 below. Diamond descriptions and valuations were completed by Mr. Nelson Karun, Diamond Specialist.

Table 6. Description and Valuation of Largest Diamonds Recovered from K120 and K147/K148

Senior VP Corporate Development Star Diamond, George Read, states: "The Orion North kimberlites have been shown to exhibit a unique set of attributes which make them a target for future exploration: over 500 million tonnes of diamond-bearing kimberlite with coarse diamond size frequency potential and significantly elevated proportions of Type IIa diamonds, particularly in K147/K148. The coarse diamond size frequency distributions, abundance of Type IIa diamonds and the shallower overburden (some 93 metres) offset the relatively low grade (8-11 cpht) and, with additional evaluation, have the potential to have positive economics."

All technical information in this press release has been prepared under the supervision of George Read, Senior Vice President Corporate Development, a registered Professional Geoscientist in the Provinces of Saskatchewan and British Columbia and Mark Shimell, Vice President Exploration, a registered Professional Geoscientist in the Province of Saskatchewan and Alberta, who are the Corporation's "Qualified Persons" under the definition of NI 43-101.

Star Diamond is a Canadian-based corporation engaged in the acquisition, exploration and development of mineral properties. Shares of Star Diamond trade on the Toronto Stock Exchange under the trading symbol "DIAM". Star Diamond's most significant asset is its interest in the Fort à la Corne property in central Saskatchewan. These kimberlites are located in close proximity to established infrastructure, including paved highways and the electrical power grid, which provide significant advantages for future mine development.

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SOURCE Star Diamond Corp.



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