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Sienna Announces Arrangements to Address Mailing Delays Resulting from Canada Post Strike

Corporate Updates

Sienna Announces Arrangements to Address

Mailing Delays Resulting from Canada Post

Strike

Vancouver, British Columbia--(Newsfile Corp. - December 12, 2024) - Sienna Resources Inc. (TSXV:

SIE) (OTC Pink: SNNAF) (FSE: A1XCQ0) ("Sienna" or the "Company") wishes to provide an update to

shareholders on the impact of the strike by the Canadian Union of Postal Workers on the Company's

ability to comply with its obligations to deliver to shareholders its financial statements and related

disclosure and proxy-related materials in respect of the Company's annual general meeting of

shareholders (the "

Meeting

") scheduled to be held at Cozen O'Connor LLP - 550 Burrard Street, Suite

2501, Vancouver, B.C., on Wednesday, December 18, 2024, at 10 a.m. PST.

Jason Gigliotti, President of Sienna stated, "We are still waiting for our Case Lake drill permit to be

approved which we expect shortly. 2025 is shaping up to be a much more active year."

As a result of the strike and pursuant to Canadian Securities Administrators' Co-ordinated Blanket Order

51-931 (Temporary Exemption) from requirements in National Instrument 51-102 (Continuous Disclosure

Requirements) and National Instrument 54-101 (Communication with Beneficial Owners of Securities of

a Reporting Issuer) to send certain proxy-related materials during a postal strike, the Company is

advising shareholders that:

1

.

At the Meeting, shareholders will be asked to vote on the following matters, all as more particularly

described in the Company's management information circular (the "

Circular

"):

1

.

To determine and set the number of directors of the Company at four (4) until the next annual

meeting;

2

.

To elect directors of the Company to hold office until the next annual meeting;

3

.

To appoint Davidson & Company LLP, Chartered Professional Accountants, as the

Company's auditor until the next annual meeting and to authorize the directors to set their

remuneration;

4

.

To consider, and if thought fit, to re-approve the Company's Omnibus Incentive Plan, as

described in the Circular;

5

.

To transact such further or other business as may properly come before the Meeting or any

adjournment or postponement thereof.

2

.

Electronic versions of the Circular, the form of proxy and all other proxy-related materials, as

applicable, have been filed and are available on SEDAR+ and have been posted to the

Company's website.

3

.

The Company has satisfied all of the conditions to rely on, and is relying on, the exemption

provided by the blanket order from the requirement to send proxy-related materials to its

shareholders.

4

.

The Company will provide copies of the applicable proxy-related materials by e-mail to each

entitled shareholder who requests same while the strike is continuing at no charge. Shareholders

should reach out to the Company by e-mail at

[email protected]

or by phone at 604-646-

6900.

5

.

If you are a registered shareholder, please contact the Company's transfer agent, Computershare,

at

[email protected]

to submit a request for your individual control

number to vote, then contact the Eproxy website to cast your vote for the coming meeting.

6

.

Beneficial shareholders are shareholders who hold their investment through a brokerage house,

depository company or other intermediary. Beneficial shareholders should contact their brokerage

house or depository company or other intermediary and ask to obtain their voting control number

and the steps of how to vote, which could include Internet voting, completing a form of proxy and e-

mailing it, directing your broker over the phone on how you wish to vote, or some other method as

described by your brokerage house or depository company. The voting deadline for the

Company's coming meeting is 10 a.m. PST on December 16, 2024.

About Sienna Resources Inc.

Sienna has significantly increased acreage of the "Stonesthrow Gold Project", consisting now of

approximately 31,718 contiguous acres prospective for gold.

Sienna has also recently acquired the

"Case Lake West Cesium and Spodumene Pegmatite Project" in Larder Lake Mining division of

Ontario, Canada roughly 100 km north of Kirkland Lake, NE Ontario.

This project consists of

approximately 7,850 contiguous acres prospective for Cesium and Spodumene Pegmatites.

Sienna has

also just acquired the 10,357

acre "Uranium Town Project" bordering Denison Mines Corporation (DML,

DNN) ,

the now 23,134 contiguous acre "Dragon Uranium Project" bordering Cameco Corporation

(CCO, CCJ)

and the 55,440 acre "Atomic Uranium Project" in the world renowned Athabasca Basin of

Saskatchewan.

Also, Sienna has the "Elko Lithium Project" in Elko County, Nevada consisting of

approximately 1830 contiguous acres directly bordering Surge Battery Metals' (NILI) "Nevada North

Lithium Project" in Elko County, Nevada who announced the highest grade lithium deposit in the USA.

Sienna is also one of the larger landholders in Clayton Valley Nevada. Sienna's Clayton Valley projects

include the Blue Clay Lithium Project, the Silver Peak South Project, and the Clayton Valley Deep Basin

Lithium Project. Clayton Valley is home to the only lithium production in North America, being Albemarle

Corp's Silver Peak deposit.

This project is also near Tesla Motors Inc.'s Gigafactory in Nevada. On

March 18, 2021, Schlumberger New Energy Venture announced the development of a lithium extraction

pilot plant with a strategic partnership with Pure Energy.

On September 10, 2024, SLB announced that

the "Nevada demonstration plant integrates direct lithium extraction (DLE), concentration and conversion

technologies to sustainably produce lithium at scale with integrated technology solution produces lithium

from brine 500 times faster than conventional methods while using significantly less land, water and

chemical reagents with a verified results confirm recovery rate of 96% lithium from brine at operational

rates."

The success that SLB achieved could have a significant future impact on the brine prospects

within Clayton Valley Nevada as Sienna is located in the deepest section of this brine deposit.

Management cautions that past results or discoveries on properties in proximity to Sienna may not

necessarily be indicative of the presence of mineralization on the Company's properties.

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.

Statements in this news release that are not historical facts are forward-looking statements.

Forward-

looking statements are statements that are not historical, and consist primarily of projections -

statements regarding future plans, expectations and developments.

Words such as "expects",

"intends", "plans", "may", "could", "potential", "should", "anticipates", "likely", "believes" and words of

similar import tend to identify forward-looking statements.

Forward-looking statements in this news

release include uncertainty of exploration and development plans regarding the property; commodity

price fluctuations; political or economic instability and regulatory changes; currency fluctuations, the

state of the capital markets; uncertainty in the measurement of mineral reserves and resource

estimates; the Company's ability to attract and retain qualified personnel and management; potential

labour unrest; reclamation and closure requirements for mineral properties and the availability of

capital to fund the Company's projects, as well as other risks and uncertainties identified under the

heading "Risk Factors" in the Company's continuous disclosure documents filed on SEDAR.

You are

cautioned that the foregoing list is not exhaustive of all factors and assumptions which may have been

used.

The Company cannot assure you that actual events, performance or results will be consistent

with these forward-looking statements, and management's assumptions may prove to be incorrect.

These forward-looking statements reflect current expectations regarding future events and operating

performance and speak only as of the date hereof and the Company does not assume any obligation

to update forward-looking statements if circumstances or management's beliefs, expectations or

opinions should change other than as required by applicable law. For the reasons set forth above, you

should not place undue reliance on forward-looking statements.

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.

To view the source version of this press release, please visit

https://www.newsfilecorp.com/release/233581