Stornoway Announces Updated Renard Mineral Resource Estimate

NEWS RELEASE.

July 23, 2013: Montreal, Quebec – Stornoway Diamond Corporation (Stock Profile – TSX:SWY) announces an updated Mineral Resource estimate by GeoStrat Consulting Services Inc. for the Renard Diamond Project, Stornoway’s 100% owned flagship development project located in north-central Quebec. The update follows the successful completion of the Renard 65 bulk sample earlier in the year and, additionally, incorporates refinements to the geological models and diamond content estimates of certain other kimberlites made since the project’s previous Mineral Resource statement was published in January 2011. Highlights of the new estimate are as follows:

A total Indicated Mineral Resource of 27.1 million carats representing an increase of 14.0% over the previous estimate; the successful conversion of 2.3 million carats (7.86 million tonnes at 29.3 carats per hundred tonnes) of near-surface Renard 65 Inferred Mineral Resources to Indicated Mineral Resources, representing kimberlite amenable to open-pit mining to 150m depth; a total Inferred Mineral Resource of 16.9 million carats, a 3.5% decrease compared to previous estimate, as increased estimates of Inferred Mineral Resources at Renard 2, 4 and 9 partially offset the conversion of material from the Inferred to the Indicated category at Renard 65.

An additional 25.7 to 47.8 million carats (54.6 to 74.9 million tonnes) have been designated a “Target for Further Exploration” to 775 m depth, below which each kimberlite remains open.

The reader is cautioned that mineral resources that are not mineral reserves do not have demonstrated economic viability. In addition, the potential quantity and grade of any exploration target is conceptual in nature, and it is uncertain if further exploration will result in it being delineated as a mineral resource.

Matt Manson, Stornoway’s President and CEO, commented: “We are pleased to be able to confirm the successful conversion of a large part of the Renard 65 kimberlite to the Indicated Resource category, for its inclusion in the Renard mine plan. This open pit ore will allow us to utilize the designed expansion capacity of our plant from 6,000 to 7,000 tonnes per day, and is expected to provide for an extended reserve tail for the project. At the same time, we have been able to convert into new Inferred Resources the large quantity of diamonds contained within the brecciated country rock that is entrained within and around the Renard 2 kimberlite. These diamonds are derived primarily from the abundant hypabyssal kimberlite which has been drilled and sampled repeatedly within the Renard 2 eruptive envelope, but which has never been incorporated into previous resource estimates. A large part of this material is expected to be mined as waste or mining dilution, and has previously been designated a zero grade in our production schedule. Both of these resource additions offer near term production gains for the project.” Matt Manson continued: “The updated Mineral Resource estimate has re-confirmed the very large upside of 25.7 to 47.8 million carats outside the formal Indicated and Inferred categories at Renard. Taken together, Renard represents one of the world’s most important new sources of high value diamonds.”

To learn more about the Renard Diamond Project – CLICK HERE.

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