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Sienna Resources Inc.: Company Update Intersected 2.8 g/t Ag over 6m including 8.3 g/t Ag over 1.5m Intersected 0.6 g/t Ag over 36m including 1.0 g/t Ag over 13.5m Polymetallic VMS system identified from maiden drill program

Drill Results Exploration Programs

Sienna Resources Inc.: Company Update

Intersected 2.8 g/t Ag over 6m including 8.3 g/t Ag over 1.5m

Intersected 0.6 g/t Ag over 36m including 1.0 g/t Ag over 13.5m

Polymetallic VMS system identified from maiden drill program

Vancouver, British Columbia--(Newsfile Corp. - April 17, 2025) - Sienna Resources Inc.

(TSXV: SIE)

(OTC Pink: SNNAF) (FSE: A1XCQ0) ("Sienna" or the "Company") wishes to announce that the

Company has received results from drill hole assays submitted on its 100% owned Case Lake Project,

80 km east of Cochrane, Ontario. Intersections of silver (Ag) were drilled including: 8.3 g/t Ag over 1.5 m

within 6 m of 2.8 g/t Ag from 137 m downhole; 0.6 g/t Ag over 36 m including 1.0 g/t Ag over 13.5 m from

67 m downhole (See Table 1). The drill program successfully identified a polymetallic volcanogenic

massive sulphide (VMS) system with intercepts of silver and copper, manganese, and zinc. The

company believes that there is potential for a VMS system at the Case Lake property as only 600 m of

strike have been tested on the ~2 km long structure.

Figure 1: Plan map of Case Lake drill holes with Ag (g/t) assays (coordinates in WGS84 / UTM Z17N).

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

https://images.newsfilecorp.com/files/854/248894_b880a5fec478c87e_002full.jpg

Table 1: Significant intercepts from maiden drill program at the Case Lake Project.

Drill Hole

From (m)

To (m)

Length (m)

Ag (g/t)

Cu (ppm)

Mn (ppm)

Zn (ppm)

CL25-01

118

148

30

0.3

105.0

878.7

354.7

including

130

134.5

4.5

0.5

150.0

617.0

834.7

CL25-02

67

103

36

0.6

189.5

976.5

155.6

including

83.5

97

13.5

1.0

363.6

808.7

137.4

CL25-02

137

143

6

2.8

50.3

952.5

97.0

including

137

140

3

5.3

59.0

760.0

54.0

including

137

138.5

1.5

8.3

71.0

665.0

35.0

CL25-03

285

294

9

0.6

100.3

1393.2

172.0

and

316.5

322.5

6

0.6

53.0

2437.5

101.3

and

328.5

331.5

3

0.5

90.5

2495.0

79.0

Table 2. Diamond drill hole parameters (WGS84 UTM Zone 17N).

Collar ID

Easting (m)

Northing (m)

Elevation (m)

Azimuth

Dip

Length (m)

CL25-01

580257

5427830

340

360

-45

297

CL25-02

579836.4

5427857

340

360

-45

333

CL25-03

579700

5427970

330

5

-50

396

About Sienna Resources Inc.

Sienna has recently 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

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

roughly 100 km north of Kirkland Lake, NE Ontario.

Sienna has also just acquired the 10,357

acre

"Uranium Town Project" bordering Denison Mines Corporation,

the now 23,134 contiguous acre

"Dragon Uranium Project" bordering Cameco Corporation

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' "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.

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.

We seek Safe Harbor.

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.

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/248894