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Sienna Resources Drills Significant Sulphide Intersections at the Case Lake Project Completed 3 diamond drill holes totalling 1,026 metres. Intersected multiple horizons of strong mineralization including disseminated and semi-massive to

Drill Results

Sienna Resources Drills Significant Sulphide

Intersections at the Case Lake Project

Completed 3 diamond drill holes totalling 1,026 metres.

Intersected multiple horizons of strong mineralization including disseminated and semi-massive to

massive sulphide hosted in fine- to medium-grained volcanic rocks.

117 core samples selected have been immediately sent to lab for analysis.

Vancouver, British Columbia--(Newsfile Corp. - March 20, 2025) - Sienna Resources Inc. (TSXV: SIE)

(OTC Pink: SNNAF) (FSE: HRJ1) (FSE: A1XCQ0) ("Sienna" or the "Company")

is pleased to announce

that the Company has completed a 3-hole diamond drilling campaign at their 100% owned Case Lake

Project, 80 km east of Cochrane, Ontario (Figure 1). The drilling program totalled 1,026 metres (Table

1). Significant intervals of sulphide mineralization were intersected, including intercepts with

disseminated and semi-massive to massive mineralization (Figures 2 and 3), hosted in strongly

sheared, intermediate volcanic successions, with regions of recrystallized gabbro and metasedimentary

rocks (Table 2). A total of 117 core samples were collected and these have been prioritized for

processing and shipping to the lab for analysis. Management cautions that until the assay results are

reported by the lab, the Company is not certain of what concentration of metals, if any, will be contained

in the drill core samples.

Jason Gigliotti, President of Sienna Resources Inc. stated, "We are pleased that the drilling was

completed on time and on budget.

I want to thank all involved for the great work. Based on what we have

seen in the core, photos included, we are optimistic about the results from the drilling program and look

forward to getting full assays back to determine the next course of action.

We expect the results back in

2-6 weeks."

Figure 1. Sienna Resources' Case Lake Property location map.

To view an enhanced version of this graphic, please visit:

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To view an enhanced version of this graphic, please visit:

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To view an enhanced version of this graphic, please visit:

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About Sienna Resources Inc.

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

approximately 31,718 contiguous acres that are prospective for gold. Sienna has also recently acquired

the 7,850 contiguous acres "Case Lake West Project" in Larder Lake Mining division of Ontario,

Canada roughly 100 km north of Kirkland Lake, Northeast Ontario. Sienna has also recently 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 1,830

contiguous acres directly bordering Surge Battery Metals' (NILI) "Nevada North Lithium Project", 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, that being Albemarle Corp's Silver Peak deposit. The Blue Clay

Lithium 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. 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.

Qualified Person:

Curtis Ferron MSc. P.Geo. a qualified person as defined by National Instrument 43-101 has reviewed

and approved the scientific and technical disclosure contained within this news release.

We seek Safe Harbor.

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/245317