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OOR.V ·

800 Square Victoria, #3500

Corporate Updates

800 Square Victoria, #3500

Montreal, Québec, H4Z 1E3

Tel: (514) 591-3988

[email protected]

NEWS RELEASE

JUNE 10th, 2025 TRADING SYMBOL: TSX-V: OOR

OPUS ONE GOLD OBTAINS 4.10 G/T GOLD OVER 7.1 M FROM HOLE NO-25-13,

AT 550 VERTICAL METERS ON ITS ZONE 1 GOLD DISCOVERY, NOYELL

PROJECT

NOT FOR DISTRIBUTION TO U.S NEWSWIRE SERVICES OR FOR

DISSEMINATION IN THE UNITED STATES

Montreal, June 10 th, 2025, Opus One Gold Corp (TSX -V: OOR) (the “Company” or

“Opus One ”) is pleased to announce that drill hole NO -25-13 from the winter drilling

program on its 100% owned Noyell project near the town of Matagami , Abitibi, Québec,

Canada, returned 4.10g/t Au over 7.1 m from 572.8 to 579.9 m. The mineralized interval

represents a true width of approximately 5.5 m within the Zone 1 structure.

This is the deepest interval on Zone 1 so far indicating that the mineralization is open

at depth. This hole was drilled in the eastern portion of Zone 1, approximately 125m to

the east of the previously announced hole NO-25-05. The mineralized zone is strong and

appears to represent an important vector of high grade within Zone 1.

Hole NO-25-10a was drilled closer to surface to test the western extension of Zone 1. It

returned a marginal value of 1.54 g/t Au over 2.2 m (true width of 1.54m) from 160.3 to

162.5 m. It also retuned an interval of 2.63 g/t Au over 3.2 m (true width of 2.29 m) from

175.2 to 178.4 m.

Hole NO-25-11 was drilled 100 m above and to the west of the previous one to test the

same possible extension of Zone 1. It also returned a marginal value of 1.56 g/t Au over

1.8 m from 111.8 to 113.6 m (true width of 1.5 m).

Hole NO-25-12 is an in -fill drill hole located nearly 200 m to the east of NO -25-10a. It

returned 2.24 g/t Au over 6.6 m (true width of 5.5 m) from 188.1 to 194.7m, at a vertical

depth of approximately 175m. Although the grade is not exceptional, the mineralized zone

appears very strong.

2025 Drill hole location and parameters to date are as follows:

2025 WINTER DRILLING RESULTS TO DATE

Drill Hole Bearing Dip Start End Length Easting Northing Elevation

NO-25-01 358,22 -60,12 0 225 225 311512,6 5487989 271,1

NO-25-02 4,93 -45,08 0 201 201 311666,3 5487946 273,53

NO-25-03 355,02 -58,02 0 171 171 311614,6 5488035 273,12

NO-25-04 357,98 -71,95 0 375 375 311510,6 5487889 271,52

NO-25-05 355,06 -70,14 0 651 651 311655,3 5487630 272,82

NO-25-06 357,95 -65,27 0 300 300 311506,4 5487919 271,46

NO-25-07 355,03 -60,07 0 177 177 311562,9 5488011 272,23

NO-25-08A 355,03 -70,16 0 600 600 311560,2 5487653 272,08

NO-25-09 9,96 -54,09 0 150 150 311516,1 5488036 271,63

NO-25-10A 356,04 -70,94 0 254,94 254,94 311462,4 5488021 270,89

NO-25-11 10,01 -55,99 0 201 201 311404,8 5488052 270,27

NO-25-12 355,09 -64,98 0 276 276 311610,6 5487923 272,35

NO-25-13 355,06 -72,97 0 651 651 311750,1 5487626 272,66

More assay results are expected soon.

Louis Morin, Opus One CEO commented: Hole NO-25-13, the deepest drilled on the

property to date, opens new horizons for Zone 1. It clearly indicates that the

mineralization is open at depth and continuous from surface down to the 550 m level. It

also appears to indicate a vector for the mineralization of Zone 1 which might be raking

steeply to the east.

Drill Hole Zone From To Length True width Au g/t

NO-25-01 Zo ne 1 135 142,3 7,3 5,8 4,12

NO-25-01 Zone 2 206,5 207 0,5 0,41 4,71

NO-25-02 Zone 1 174,3 174,8 0,5 0,47 1,06

NO-25-02 Zone 2 184,3 187 2,7 2,52 0,21

NO-25-03 Zone 1 57,2 63,9 6,7 5,26 3,79

NO-25-03 Zone 2 123,2 124,2 1 0,8 1,32

NO-25-04 Zone 1 297,8 298,8 1 0,72 2,47

NO-25-04 Zone 2 354,6 355,1 0,5 0,37 1,01

NO-25-05 Zone 1 605,7 606,7 1 0,8 1,14

NO-25-05 Zone 2 628 628,9 0,9 0,8 0,17

NO-25-06 Zone 1 232,2 240,6 8,4 6,6 5,57

NO-25-06 Zone 2 289,2 291 1,8 1,46 0,52

NO-25-07 Zone 1 95,75 114,7 18,95 15,16 4,22

NO-25-07 Zone 2 159 161,7 2,7 2,2 3,67

NO-25-08A Zone 1 523,9 527, 8 3,9 3,25 2,34

NO-25-08A Zone 2 581,8 582, 8 1 0,85 0,04

NO-25-09 Zone 1 80,8 86,8 6 5,16 2,32

NO-25-09 Zone 2 115,9 117,1 1,2 1,04 6,63

NO-25-10A Zone 1 160,3 162, 5 2,2 1,54 1,54

NO-25-10A Zone 3 175,2 178, 4 3,2 2,29 2,63

NO-25-10A Zone 2 203 210, 3 7,3 5,42 1,99

NO-25-11 Zone 1 111,8 113,6 1,8 1,53 1,56

NO-25-11 Zone 2 161,7 165,8 4,1 3,54 2,23

NO-25-12 Zone 1 188,1 194,7 6,6 5,34 2,24

NO-25-12 Zone 2 250,5 251,2 0,7 0,59 0,04

NO-25-13 Zone 1 572,8 579,9 7,1 5,34 4,10

NO-25-13 Zone 2 647,7 648,6 0,9 0,7 0,98

Sample preparation, analysis and QAQC program

All core recovered is NQ size. All samples are described, labelled, cut (diamond saw)

and bagged at Technominex’ facilities in Rouyn- Noranda. Samples are then shipped to

AGAT certified Laboratory in Val D’or for preparation. Sample pulps are then shipped to

various AGAT laboratories in Canada for analysis. Samples are assayed for gold using

by Fire Assay (50g), with ICP-OES Finish. All samples equal or above 10 g/t Au are

submitted to ore grade gravimetric finish.

Opus One’s QAQC program consists of one control sample inserted, at Technominex’

facility, after 9 regular samples. Control samples consist of a certified blank and various

gold grades certified material.

OPUS ONE Resources Inc.

Opus One Resources Inc. is a mining exploration company focused on discovering high

quality gold and base metals deposits within strategically located properties in proven

mining camps, close to existing mines in the Abitibi Greenstone Belt, north- western

Quebec and north-eastern Ontario - one of the most prolific gold mining areas in the world.

Opus One holds assets in the Val-d'Or and Matagami mineral districts.

An independent qualified person, Pierre O’Dowd P.Geo, has verified and approved the

data disclosed, including sampling, analytical, and test data underlying the information or

opinions contained in the written disclosure as required by section 3.1 and 3.2 of NI43-

101.

Forward-Looking Statements

This news release contains statements that may constitute “forward-looking information”

within the meaning of applicable Canadian securities legislation. Forward- looking

information may include, among others, statements regarding the future plans, costs,

objectives or performance of Opus One, or the assumptions underlying any of the

foregoing. In this news release, words such as “may”, “would”, “could”, “will”, “likely”,

“believe”, “expect”, “anticipate”, “intend”, “plan”, “estimate” and similar words and t he

negative form thereof are used to identify forward- looking statements. Forward- looking

statements should not be read as guarantees of future performance or results, and will

not necessarily be accurate indications of whether, or the times at or by which, such future

performance will be achieved. No assurance can be given that any events anticipated by

the forward- looking information will transpire or occur, including the anticipated

exploration program on the project, the results of such exploration program , the

development of the project and what benefits Opus One will derive from the project, the

expected demand for lithium. Forward- looking information is based on information

available at the time and/or management’s good-faith belief with respect to future events

and are subject to known or unknown risks, uncertainties, assumptions, and other

unpredictable factors, many of which are beyond Opus One’ control.

These risks, uncertainties and assumptions include, but are not limited to, those

described under “Financial Instruments” and “Risk and Uncertainties in Opus One’ Annual

Report for the fiscal year ended August 31st, 2022, a copy of which is available on SEDAR

at www.sedar.com and could cause actual events or results to differ materially from those

projected in any forward-looking statements. Opus One does not intend, nor does Opus

One undertake any obligation, to update or revise any forward- looking information

contained in this news release to reflect subsequent information, events or circumstances

or otherwise, except if required by applicable laws.

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 the release.

For more information, please contact:

Louis Morin

Chief Executive Officer & Director

Tel.: (514) 591-3988

Michael W. Kinley, CPA, CA

President, Chief Financial Officer & Director

Tel: (902) 826-1579

[email protected]

Visit Opus One’s website: www.OpusOneGold.com