Sienna Resources Significantly Expands the Marathon North Platinum-Palladium Property Bordering Generation Mining Limited in Northern Ontario

Vancouver, British Columbia--(Newsfile Corp. - February 18, 2020) - Sienna Resources Inc. (TSXV: SIE) (FSE: A1XCQ0) (OTC Pink: 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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Map 1: Sienna Project Map

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Jason Gigliotti, President of Sienna, stated, "This new land acquisition places Sienna as one of the largest landholders in this region directly bordering Generation's platinum-palladium deposit. As palladium prices are right near all-time highs, this new acquisition gives Sienna two large size platinum-palladium projects with work programs simultaneously being planned. Not only do we expect to commence operations on this new project in Ontario but we also anticipate drilling to start in the coming weeks on our Flagship Platinum-Palladium-Nickel Slättberg Project in Sweden, on which we are partnered with a NYSE mining company. Management anticipates that the coming months will be transformative in Sienna's corporate growth trajectory. These are exciting times for Sienna's management and shareholders."

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

Sienna Resources Inc. is focused on exploring for and developing high-grade deposits in politically stable, environmentally responsible and ethical mining jurisdictions. Sienna's current projects include the Flagship Platinum-Palladium-Nickel Slättberg Project in Southern Sweden on which Sienna is partnered with an NYSE listed mining company. Sienna's Marathon North Platinum-Palladium Property is located in Northern Ontario directly bordering Generation Mining Ltd.'s 7.1-million-ounce palladium-equivalent Marathon Deposit. Sienna also has the Clayton Valley Deep Basin Lithium Project in Nevada, home to the only lithium brine basin in production in North America, in the direct vicinity of Albemarle Corp's Silver Peak deposit and Tesla Motors Inc.'s Gigafactory.

For further information or if you would like to be added to Sienna's email list, please visit our website or send an email to info@siennaresources.com or follow our twitter account: @SiennaResources.

Contact Information
Tel: 1.604.646.6900
Fax: 1.604.689.1733
www.siennaresources.com
info@siennaresources.com

"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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