Vancouver, British Columbia--(Newsfile Corp. - February 18, 2020) - Sienna Resources Inc. (TSXV:SIE) (FSE: A1XCQ0) (OTC:SNNAF) (the "Company") is pleased to announce that it has significantly increased its land holdings on its Marathon North Platinum-Palladium Property to approximately 16,500 acres (from approximately 2,500 acres announced in a news release on Jan. 23, 2020) in Northern Ontario directly bordering Generation Mining Limited's Marathon Palladium Project. This new acreage makes Sienna one of the largest landholders in the Coldwell Complex other than Generation Mining. The Coldwell Complex is the largest alkaline complex in North America and hosts the Marathon platinum-palladium deposit. According to Generation Mining's webpage, the Marathon deposit is 'one of' the largest undeveloped platinum group metal mineral resources in North America hosting several PGM-Cu (platinum-group-metal-copper) deposits, including the 7.1-million-ounce palladium-equivalent Marathon Deposit. On January 6, 2020, Generation Mining Ltd. released a preliminary economic assessment (PEA) giving Marathon an after-tax net present value (NPV) of $871 million.

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The technical contents of this release were approved by Greg Thomson, PGeo, a qualified person as defined by National Instrument 43-101. Management cautions that past results or discoveries on properties in proximity to Sienna may not necessarily be indicative to the presence of mineralization on the Company's properties. These new claims were acquired via MLAS.

About Sienna Resources

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Contact Information
Tel: 1.604.646.6900
Fax: 1.604.689.1733
www.siennaresources.com
[email protected]

"Jason Gigliotti"
President, Director
Sienna Resources Inc.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this press release.

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