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Metallis Provides Corporate Update Including Technical Advisor Appointment

Management Changes

METALLIS PROVIDES CORPORATE UPDATE

INCLUDING TECHNICAL ADVISOR

APPOINTMENT

VANCOUVER, BC

,

Dec. 29, 2025

/CNW/ - Metallis Resources Inc. (TSXV: MTS) (OTCQB: MTLFF)

("Metallis" or the "Company") announces that long-standing director Dr.

David Webb

, Ph.D., P.Geol.,

P.Eng., has expanded his role with the Company and assume the position of Technical Advisor

supporting the development of the Greyhound Property. Dr. Webb's decision to deepen his

involvement reflects both his increased availability in 2026 and his ongoing commitment to the

Company's technical and strategic advancement of the project.

Metallis also announces that the Company recently participated in a corporate interview with

Goldfinger Capital (See link below) and has engaged Mr.

Robert Sinn

to provide communication

services.

Fiore Aliperti

, Metallis' President and CEO, commented, "We're very happy to be able to add Dr.

Webb to our technical team. As a director he has provided invaluable input over the years on the

regulatory side of the Company. With his addition to the technical team, he brings a wealth of

experience with the type of mineralization displayed at the Greyhound project. The fact we're now

able to tap into his vast geological experience is great news for Metallis."

Appointment of Dr.

Dave Webb

as Technical Advisor

Due to Dr.

Dave Webb's

increased availability for 2026, he has been appointed to the technical

advisory board and will take on an active role in advancing the Greyhound Property. The Company is

now able to leverage his extensive technical expertise more directly in support of advancing

exploration and deposit-definition work, particularly in structurally controlled vein-style mineralization,

an area that Webb has extensive experience.

Dr. Webb is a Registered Professional Geologist and Professional Engineer with more than 30

years of experience in mineral exploration and project development across

Canada

and

internationally. His career includes major discoveries in the

Yellowknife

region, where he identified

both the largest granitic-hosted gold deposit in the

Northwest Territories

and the largest gold deposit

discovered in the Yellowknife Greenstone Belt in the past 30 years, and he has advanced multiple

projects through early-stage permitting, engineering studies, and resource delineation. He holds an

M.Sc. and Ph.D. in Geological Sciences, specializing in structural and geochemical controls on gold

mineralization.

Interview with Goldfinger Capital

Metallis recently participated in an interview with Goldfinger Capital, during which management

discussed the history of the Greyhound Property, the recently completed 2025 drill program, assay

results, and the Company's exploration plans for 2026. The interview can be viewed

HERE

(

https://www.youtube.com/watch?v=XOM_KPgeAbE

).

Engagement of Consulting Services –

Robert M. Sinn

The Company has entered into an agreement dated

December 1,2025

with Mr.

Robert M. Sinn

to

provide communication services for a six-month period, including promotional videos, editorial

coverage, and news release dissemination. Mr. Sinn received a cash fee of

US$15,000.00

(inclusive

of taxes) for these services. To the Company's knowledge, Mr. Sinn has no present interest, directly

or indirectly, in Metallis or its securities, nor any right or present intent to acquire such an interest.

There are no performance factors in the agreement, and he will not receive shares or options as

compensation.

Mr. Sinn is a professional trader and macroeconomic market analyst specializing in precious metals,

hard-rock mining, and commodities. He is well recognized within the junior-mining sector for his

technical and fundamental market commentary and serves as the senior content creator at

Goldfinger Capital.

About the Greyhound Property

In

February 2024

, the Company optioned the Property which is in Custer County,

Idaho

,

approximately 42 km northwest of the town of Stanley and 35 km south of Perpetua Resources'

Stibnite Mine. The Property was the center of an active silver mining camp in the early 1900's and at

one point, had a smelter and two active mines situated along the 3.5 km Greyhound shear.

The Greyhound mineralization is hosted by prominent structural zones with polymetallic quartz -

sulphide veins containing elevated concentrations of gold, silver, antimony (a critical

mineral), lead and zinc.

The Greyhound property shares certain geological characteristics with the Lucky Friday Mine in

northern

Idaho

. Both properties exhibit vein mineralization occurring as fracture-fillings,

disseminations, and tabular masses of galena and tetrahedrite along with accessory pyrite in a

gangue of siderite, calcite and quartz. The Lucky Friday zone is a singular, curved tabular body that

dips almost vertically. The vein at Lucky Friday has a strike length of up to

450 m

and a width that

varies from centimeters to as much as

6 m

. The average varies from 1.2 to

1.8 m

over the full length

(SLR, 2022).

Metallis' states that while the Lucky Friday Mine may have some similar geology to Greyhound, we

do not suggest that any comparable results or information will be obtained from our exploration of

Greyhound.

References

SLR, 2022 Technical Report Summary on the Lucky Friday Mine, Idaho, USA S-K 1300 Report

Hecla Mining.

About Metallis

Metallis Resources Inc. is a

Vancouver

-based company focused on the exploration for gold, copper

and silver on its 100%-owned Kirkham Property in

Canada

, situated in northwest

British Columbia's

Golden Triangle, and on the Greyhound Property, a gold/silver/antimony property in

Idaho, USA

.

Metallis trades under the symbols MTS on the TSX Venture Exchange, MTLFF on the OTCQB

Exchange, and 0CVM on the Frankfurt Stock Exchange, and has 85,730,003 common shares issued

and outstanding.

On behalf of the Board of Directors:

/s/ "Fiore Aliperti"

Chief Executive Officer, President, and Director

CAUTION REGARDING FORWARD-LOOKING STATEMENTS

This Press Release may contain statements which constitute 'forward-looking' statements, including

statements regarding the plans, intentions, beliefs and current expectations of the Company, its

directors, or its officers with respect to the future business activities and operating performance of

the Company. The words

"may," "would", "could", "will", "intend", "plan", "anticipate", "believe", "estimate", "expect" and similar

expressions, as they relate to the Company, or its management, are intended to identify such

forward-looking statements. Investors are cautioned that any such forward-looking statements are

not guarantees of future business activities or performance and involve risks and uncertainties, and

that the Company's future business activities may differ materially from those in the forward-looking

statements because of numerous factors. Such risks, uncertainties and factors are described in the

periodic filings with the Canadian securities' regulatory authorities, including quarterly and annual

Management's Discussion and Analysis, which may be viewed on SEDAR at

www.sedarplus.ca

.

Should one or more of these risks or uncertainties materialize, or should assumptions underlying the

forward-looking statements prove incorrect, actual results may vary materially from those

described herein as intended, planned, anticipated, believed, estimated, or expected.

Although the Company has attempted to identify important risks, uncertainties and factors which

could cause actual results to differ materially, there may be others that cause results not to be as

intended, planned, anticipated, believed, estimated, or expected. The Company does not intend, and

does not assume any obligation, to update these forward-looking statements.

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in

policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this

release. The TSX-V Stock Exchange has neither approved nor disapproved of the contents of this

news release.

SOURCE

Metallis Resources Inc.

View original content to download multimedia:

http://www.newswire.ca/en/releases/archive/December2025/29/c9094.html

%SEDAR: 00025829E

For further information:

For further information contact Mr. Aliperti at: Tel: 604-688-5077, Email:

[email protected], Web: www.metallisresources.com

CO: Metallis Resources Inc.

CNW 08:00e 29-DEC-25