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SIEN.V ·

Sienna Resources Launches New Website with a Focus on Battery Metals

Marketing Announcement

Sienna Resources Launches New Website with a Focus

on Battery Metals

Vancouver, British Columbia--(Newsfile Corp. - December 15, 2017) - Sienna Resources (TSXV: SIE) (FSE: HRJ1) (OTC Pink:

SNNAF) is pleased to announce it has launched its new corporate website and branding.

Please visit the site at

www.siennaresources.com

.

Recently Sienna received TSX Venture

approval to go forward into an exploration and option agreement to acquire the Slättberg

Cobalt-Nickel-Copper Project in Sweden (the "Project"). The Project consists of two adjacent exploration permits comprising

approximately 9513 contiguous acres.

Jason Gigliotti president of Sienna states, "We are very pleased to receive approval for this exciting cobalt-nickel-copper

prospect.

Cobalt prices have just crossed fresh nine year highs as of yesterday, and we look forward to advancing this prospect.

There are 12 historic mines on this property and with modern mining approaches, we are very optimistic about what this project

could contain.

We expect to be drilling early 2018 as the project is drill ready now."

Northvolt is planning to be the largest battery factory in Europe at roughly the same size as Tesla's Gigafactory. Jason Gigliotti

states, "Northvolt wants to locally source as much battery material as possible such as cobalt and nickel. There are now more

than 20 mega battery factories currently being planned or constructed globally, creating a massive demand on the battery metals

such as lithium, cobalt and nickel. Sienna is focused on exploring and developing projects that will meet this insatiable demand."

Slättberg is located 25 kilometers northwest of Falun, Sweden. Slättberg is a historic mining camp hosting cobalt-nickel-copper

rich massive sulfide mineralization that occurs within a two kilometer belt of historic nickel-copper mines. The Project contains

drill defined massive sulfide mineralization that extends to ~100 meters in depth, and remains open for expansion at depth and

along strike.

The Project is accessible year round, with nearby rail, power and 5 smelters in the Nordic region.

At least 12

historic mines are located on the property, with historic operations dating back to the late 1800's.

Geophysics and Target Map

To view an enhanced version of the

Geophysics and Target Map, please visit:

[

http://orders.newsfilecorp.com/files/854/31360_a1513362997449_56.jpg

]

Mineralization at Slättberg is hosted by 1.8-1.9 Ga (Svecofennian) supracrustal rocks (metavolcanics and metasediments)

located along the southwestern flank of a large gabbroic intrusive complex. The historic mines are positioned along an east-west

trend of massive sulfide occurrences developed in and around a similarly oriented body of "leptite". This is a local term used to

describe rhyolitic/felsic tuffaceous rocks commonly associated with sulfide mineralization in Bergslagen. Mafic and ultramafic

rocks also occur in and around the mine workings.

Sweden is at the forefront of an exploration and development boom in the mining industry. The country's favorable business

environment includes a low corporate income tax rate, a proactive geological survey, and broad public support for export-led

resource extraction. Sweden has a long history of mining, and is host to some of Europe's largest active mines.

The technical contents of this release were approved by Greg Thomson, PGeo, a qualified person as defined by National

Instrument 43-101.

If you would like to be added to Sienna's email list please email

[email protected]

for information or join our twitter

account at

@SiennaResources

.

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.