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ONYX.V ·

Onyx Gold Intersects 1.87 g/t Gold Over 48.1 Meters at the Argus Zone, Munro-Croesus Project, Timmins, Ontario Including 7.14 g/t Gold over 4.5 Meters and 4.05 g/t Gold over 10.0 Meters

Drill Results

Onyx Gold Intersects 1.87 g/t Gold Over 48.1

Meters at the Argus Zone, Munro-Croesus

Project, Timmins, Ontario

Including 7.14 g/t Gold over 4.5 Meters and 4.05 g/t Gold over

10.0 Meters

Vancouver, British Columbia--(Newsfile Corp. - September 10, 2024) -

Onyx Gold Corp.

(TSXV:

ONYX) (OTCQX: ONXGF)

("

Onyx

" or the "

Company

") is pleased to announce the final results from the

Company's earlier drilling campaign at its Munro-Croesus Project ("

Munro-Croesus

" or the "

Project

")

in the Timmins gold camp, Ontario (

Figure 1

).

Assay results from the final drill hole of the Company's 2024 drill Program (the "

Program

") returned a

new wide zone of strong gold mineralization located immediately north of the main Argus Zone trend.

Assay Highlights for Drillhole MC24-163 (Table 1)

Drill Hole

From

To

Length

Au

(meters)

(meters)

(meters)

(g/t)

MC24-163

230.40

278.50

48.10

1.87

Including

241.80

246.30

4.50

7.14

And Including

265.50

275.50

10.00

4.05

*Intersections reported as drilled width, true width unknown

"We are very pleased with these results, which demonstrate the prospectivity of the Munro-Croesus

Project and the underlying potential of an emerging gold deposit at the Argus Zone," said Brock

Colterjohn, President & CEO. "While still early days, it is difficult to ignore the significance of this new

zone that combines higher-grades with surface bulk-mining widths and shows the system progressively

getting richer as we track it to the west."

"Those that have followed Onyx Gold and its history will be aware of management's long-term strategy to

methodically consolidate significant land positions of underexplored mining claims covering prime

geological potential. It is rewarding to receive strong validation of our approach with these excellent drill

results. With a tight share structure, respectable treasury, and blue-chip shareholder base, the Company

and its investors are in a great position to make the most of what may be the very early stages of a

potentially significant new discovery within Canada's most prolific gold jurisdiction."

Geological Context for Drillhole MC24-163 Intersection

Context is important when assessing early exploration results and their significance for predicting

exploration upside. Key factors that influence our view on the relevance of this new intersection and the

potential of the Argus zone include:

The grade x thickness profile of drill hole MC24-163 compares well against "discovery hole"

intersections of known major (>2Moz) Canadian gold deposits

Association with a large and growing footprint of bulk-tonnage style gold mineralization (0.1 to >2.0

g/t over a 750m x 200m area)

Association with the regional-scale Pipestone fault that is known to be an important control on gold

mineralization within the region

Proximity to multiple high-grade gold veins within the large (104 sq. km) Munro-Croesus claim

block, including the past-producing bonanza-grade Croesus Mine and the newly discovered GM

vein

Exceptional regional gold endowment - located in the greater Timmins mining camp that has

produced close to 80Moz of gold to date, the most of any mining jurisdiction in Canada.

Also, it is

adjacent to several multi-million ounce deposits such as the 3.0Moz Black Fox mine complex

located 4 km to the southwest and the 3.5Moz Fenn-Gb deposit located 6 km to the east

1

Discussion of Results

Drill hole MC24-163 was one of five drill holes completed during the Program at the Argus Zone, a 750m

x 200m near-surface bulk tonnage target located three kilometers northwest of the past-producing

Croesus Gold Mine (

Figure 2

). It was collared 35 m north of the collar of hole MC23-140 which returned

0.96 g/t Au over 27.6 meters (

Figure 3

). Hole MC24-163

represents the best intersection drilled to

date at the Argus Zone

.

The strong mineralization intersected in MC24-163 is located immediately north of the main

trend of the Argus Zone and represents an entirely new zone of high-grade mineralization

. With

only one drill hole testing the area to date, this new Argus North Zone remains completely unconstrained

and open in all directions.

The mineralization in hole MC24-163 displays typical 'Argus-style' characteristics with strongly silicified

mafic variolitic volcanics with 3-10% pyrite stringers and local specular hematite and higher gold grades

than previously reported drill holes.

The Company is currently carrying out mechanical stripping, geological mapping and geochemical

sampling in the area where the intersection in hole MC24-163 would project up-dip to surface, and

where historic trenching within the same key prospective variolitic basalt units along the Pipestone Fault,

suggests strong potential for the system to extend well beyond the current limit of drilling

.

Recent surface grab samples collected by Company geologists at Argus West, more than 500 meters

from Hole MC24-163, returned up to

2.4 g/t Au

within similarly pyritized and silicifed mafic variolitic

volcanics as host the Argus Zone.

Onyx is also currently evaluating prospects on the recently acquired Lalonde and Highway claims to the

northeast of the Croesus mine to prioritize drill targets. The Company plans to return in Q4-2024 with a

drill program to follow up on the Q1-2024 results on the Argus Zone and to continue to follow the

mineralization to the west, and drill test several prospects on the Lalonde claims.

Figure 1 - Location of Munro-Croesus Gold Project, Ontario

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

https://images.newsfilecorp.com/files/9800/222774_54f20800140d68f1_002full.jpg

Figure 2 - Plan Map of Showing Location of 2024 Drill Holes on the Argus Zone

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

https://images.newsfilecorp.com/files/9800/222774_54f20800140d68f1_003full.jpg

Figure 3 - Cross-Section Showing Location of Drill Holes MC24-163, MC24-164, and MC23-140

on the Argus Zone - Looking East

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

https://images.newsfilecorp.com/files/9800/222774_54f20800140d68f1_004full.jpg

Table 2 - Significant Assay Results from Hole MC24-163 Completed at the Argus Zone

Drill Hole

From

To

Length

Au

(meters)

(meters)

(meters)

(g/t)

MC24-163

230.40

278.50

48.10

1.87

Including

241.80

246.30

4.50

7.14

Including

242.80

243.80

1.00

11.60

And Including

265.50

275.50

10.00

4.05

Including

269.30

270.00

0.70

11.20

Discussion of the 2024 Spring Drill Program

A total of 25 holes (MC24-143 to 167) totaling 3,280.5 m were drilled on the Munro-Croesus Project in

March and April, including twenty (20) holes totaling 1,731 m on the GM Vein and five (5) holes totaling

1,549.5 m on the Argus Zone. All assay results have now been released for the Program.

The Munro-Croesus Project

The Munro-Croesus Project is located along Highway 101 in the heart of the Abitibi greenstone belt,

Canada's premier gold mining jurisdiction (

Figure 1

). This large, 100% owned land package includes

the past-producing Croesus Gold Mine, which yielded some of the highest-grade gold ever mined in

Ontario. Extensive land consolidation from 2020-2023 has unified the patchwork of patented and

unpatented mining claims surrounding the Croesus Gold Mine into one coherent package (

Figure 1

)

and enhanced the project's exploration potential.

The Project covers 104 km

2

of highly prospective geology within the influence of major gold-bearing

structural breaks. Bulk-tonnage gold deposits located in the immediate region include the Fenn-Gib gold

project being developed by Mayfair Gold Corp. that contains an Indicated Resource of 3.38 Moz at 0.93

g/t Au and an Inferred Resource of 157 koz at 0.85 g/t Au, and the Tower Gold Project being developed

by STLLR Gold Inc. that contains an open pit Indicated Resource of 4.46 Moz at 0.92 g/t Au and an

Inferred Resource of 8.29 Moz at 1.09 g/t Au

1

.

About the Timmins Area Gold Properties

Onyx owns 100% of each of its three Timmins properties. The Munro-Croesus Gold Project is located

approximately 75 km east of Timmins, proximal to the Porcupine-Destor and Pipestone Faults, and

approximately 2 km northwest and along trend of Mayfair Gold Corp.'s multi-million-ounce Fenn-Gib gold

deposit. Mining occurred intermittently at Munro-Croesus between 1915 and 1936. The Golden Mile 140

km

2

property is located 9 km northeast of Newmont's multi-million-ounce Hoyle Pond deposit in

Timmins. The Timmins South 187 km

2

property is located to the south and southeast of Timmins and

surrounds the Shaw dome structure.

About Onyx Gold

Onyx Gold is an exploration company focused on well-established Canadian mining jurisdictions, with

assets in Timmins, Ontario, and Yukon Territory. The Company's extensive portfolio of quality gold

projects in the greater Timmins gold camp includes the Munro-Croesus Gold property, renowned for its

high-grade mineralization, plus two additional earlier-stage large exploration properties, Golden Mile

and Timmins South. Onyx Gold also controls four properties in the Selwyn Basin area of Yukon Territory,

which is currently gaining significance due to recent discoveries in the area. Onyx Gold's experienced

board and senior management team are committed to creating shareholder value through the discovery

process, careful allocation of capital, and environmentally/socially responsible mineral exploration.

On Behalf of Onyx Gold Corp.

"

Brock Colterjohn

"

President & CEO

For further information, please visit the Onyx Gold Corp. website at

www.onyxgold.com

or contact:

Brock Colterjohn, President & CEO

or

Nicole Hoeller, VP of Communications

Phone:

1-604-629-1165

or North American toll-free

1-855-629-1165

Email:

[email protected]

or

[email protected]

.

Website:

www.onyxgold.com

LinkedIn:

https://www.linkedin.com/company/onyx-gold-corp/?viewAsMember=true

Twitter:

https://twitter.com/OnyxGoldCorp

1. Fenn-Gib Gold Project and Tower Gold Project mineral resources compiled from public sources and are provided for general information

purposes. Readers are cautioned that the Company has no interest in or right to acquire any interest in adjacent properties and they are not

indicative of mineral deposits on the Company's properties or any potential exploration thereof.

Additional Notes:

Starting azimuth, dip and final length (Azimuth/-Dip/Length) for the one drill hole reported today are noted

as follows: MC24-163 (000/45/278.5m)

Samples of drill core were cut by a diamond blade rock saw, with half of the cut core placed in individual

sealed polyurethane bags and half placed back in the original core box for permanent storage. Sample

lengths typically vary from a minimum 0.2-meter interval to a maximum 1.5-meter interval, with an

average 0.5 to 1.0-meter sample length.

Drill core samples were delivered by truck in sealed woven

plastic bags to ALS Geochemistry laboratory facility in Timmins, Ontario for sample preparation with

final analysis at ALS Geochemistry Analytical Lab facility in North Vancouver, BC.

ALS Geochemistry

operate meeting all requirements of International Standards ISO/IEC 17025:2017 and ISO 9001:2015.

Gold is determined by fire-assay fusion of a 50-gram sub-sample with atomic absorption spectroscopy

(AAS).

Samples that return values >10 ppm gold from fire assay and AAS are determined by using fire

assay and a gravimetric finish. Various metals including silver, gold, copper, lead and zinc are analyzed

by inductively coupled plasma (ICP) atomic emission spectroscopy, following multi-acid digestion.

The

elements copper, lead and zinc are determined by ore grade assay for samples that return values

>10,000 ppm by ICP analysis.

Silver is determined by ore-grade assay for samples that return >100

ppm. All ALS Geochemistry sites operate under a single Global Geochemistry Quality Manual that

complies with ISO/IEC 17025:2017. ALS Geochemistry follows the quality management and operational

guidelines set out in the international standards ISO/IEC 17025 - "General Requirement for the

Competence of Testing and Calibration Laboratories" and ISO 9001 - "Quality Management Systems".

The Company maintains a robust QA/QC program that includes the collection and analysis of duplicate

samples and the insertion of blanks and standards (certified reference material).

Ian Cunningham-Dunlop, P.Eng., Senior VP Exploration for HighGold Mining Inc. and a qualified person

("

QP

") as defined by Canadian National Instrument 43-101, has reviewed and approved the technical

information contained in this release.

Neither 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

release.

Forward looking information: This news release includes certain "forward-looking information" within

the meaning of Canadian securities legislation and "forward-looking statements" within the meaning

of the United States Private Securities Litigation Reform Act of 1995 (collectively "forward looking

statements").

Forward-looking statements include predictions, projections, and forecasts and are often, but not

always, identified by the use of words such as "seek", "anticipate", "believe", "plan", "estimate",

"forecast", "expect", "potential", "project", "target", "schedule", "budget" and "intend" and statements

that an event or result "may", "will", "should", "could" or "might" occur or be achieved and other similar

expressions and includes the negatives thereof. All statements other than statements of historical fact

included in this release, including, without limitation, statements regarding the Company's planned

exploration programs and drill programs and potential significance of results are forward-looking

statements that involve various risks and uncertainties. There can be no assurance that such

statements will prove to be accurate and actual results and future events could differ materially from

those anticipated in such statements. Forward-looking statements are based on a number of material

factors and assumptions. Important factors that could cause actual results to differ materially from

Company's expectations include actual exploration results, changes in project parameters as plans

continue to be refined, results of future resource estimates, future metal prices, availability of capital,

and financing on acceptable terms, general economic, market or business conditions, uninsured

risks, regulatory changes, defects in title, availability of personnel, materials, and equipment on a

timely basis, accidents or equipment breakdowns, delays in receiving government approvals,

unanticipated environmental impacts on operations and costs to remedy same, and other exploration

or other risks detailed herein and from time to time in the filings made by the Company with securities

regulators. Although the Company has attempted to identify important factors that could cause actual

actions, events, or results to differ from those described in forward-looking statements, there may be

other factors that cause such actions, events, or results to differ materially from those anticipated.

There can be no assurance that forward-looking statements will prove to be accurate, and accordingly

readers are cautioned not to place undue reliance on forward-looking statements.

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

https://www.newsfilecorp.com/release/222774