Onyx Acquisition Co. I (ONYX)

Argus West Drilling Intersects Multiple Gold Occurrences Returning 21.2 m of 2.1 g/t Au, Including 14.0 m of 3.0 g/t Au and a Second Interval of 5.0 m of 5.1 g/t Au Starting 9.8 m From Surface -- Demonstrates Potential for Repeated Argus North-Style Mineralized Zones Vancouver, British Columbia--(Newsfile Corp. - December 3, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") is pleased to the announce the discovery of a new zone of near-surface gold mineralization, 250 meters ("m") southwest of the Argus North Zone ("Argus North"). This new discovery the latest advancement of the Company's ongoing 75,000 m phase I/II/III diamond drill program (the "Program") at its 100%-owned Munro-Croesus Project ("Munro-Croesus" or the "Project"), located 75 km east of Timmins, Ontario.

Best Intersection to Date from Argus North Vancouver, British Columbia--(Newsfile Corp. - November 17, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") is pleased to report another strong drill intercept from the Argus North Zone ("Argus North") as part of the Company's ongoing drill program (the "Program") at its 100%-owned Munro-Croesus Project ("Munro-Croesus" or the "Project"), located 75 km east of Timmins, Ontario. The latest results come from hole MC25-232, which was designed to test a newly defined northeast-trending structural corridor beneath the Argus North outcrop.

Vancouver, British Columbia--(Newsfile Corp. - November 13, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") is pleased to announce a fully-funded 50,000-meter ("m") phase three expansion to the diamond drill program (the "Program") at its 100%-owned Munro-Croesus Project ("Munro-Croesus" or the "Project"), located 75 kilometers east of Timmins, Ontario (Figure 3). The new 50,000-meter program, budgeted at $11 million and utilizing three drill rigs, follows a successfully completed 25,000 m campaign, (81 holes-36 reported to date).

Vancouver, British Columbia--(Newsfile Corp. - October 22, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") is pleased to announce additional drill results from the Company's ongoing 25,000 metre drill program (the "Program') at its 100% owned Munro-Croesus Project ("Munro-Croesus" or the "Project"), located 75 km east of Timmins, Ontario. Results reported today are for four (4) drill holes which continue to expand the gold mineralization at the Argus North Zone ("Argus North" or the "zone") and 12 holes testing new targets up to 175 meters east and 525 meters west of Argus North.

Vancouver, British Columbia--(Newsfile Corp. - October 15, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") is pleased to announce that it has closed its previously announced non-brokered private placement (the "Non-Brokered Private Placement") involving strategic investors for gross aggregate proceeds of $6,439,500. Together with the Company's recently completed "bought deal" private placement (see news release of the Company dated October 2, 2025), the Company has raised gross aggregate proceeds of approximately $26,440,000.

Channel samples up to 5.0 g/t Au over 4.0 m within 2.0 g/t Au over 21.3 m and step-out drilling up to 5.0 g/t Au over 8.6 m within 1.8 g/t Au over 37.8 m confirm the potential for a near-surface, road-accessible gold discovery Vancouver, British Columbia--(Newsfile Corp. - October 7, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") is pleased to announce surface channel sampling and drill results from the Company's ongoing 25,000 metre drill program (the "Program') at its 100% owned Munro-Croesus Project ("Munro-Croesus" or the "Project"), located 75 km east of Timmins, Ontario. Results are reported today for four (4) shallow step-out holes and a series of sawn channel samples of new outcrop exposed by mechanical stripping near previously reported drill hole MC25-180 (see Company news release dated July 23, 2025) which returned 4.0 meters ("m") of 5.9 grams per tonne gold ("g/t Au") within 50.4 meters of 1.9 g/t Au starting at 6.1 m downhole.

Total Proceeds from Recent Financings Reach $26.4 Million, Providing Strong Financial Flexibility for Onyx Gold's Exploration Programs Vancouver, British Columbia--(Newsfile Corp. - October 6, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") is pleased to announce an upsize to its previously announced non-brokered private placement priced at $2.43 per NB FT Share (as defined below), now for gross aggregate proceeds of approximately $6,445,000 (the "Non-Brokered Private Placement"), involving strategic investors. Between the bought-deal offering that closed on October 2nd, 2025 (See news release dated October 2, 2025) and the Non-Brokered Private Placement, the Company expects to raise aggregate gross proceeds of approximately $26,445,000.

Vancouver, British Columbia--(Newsfile Corp. - October 2, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") is pleased to announce the closing of its previously announced "bought deal" private placement (the "Offering") of (a) 4,740,000 common shares of the Company that qualify as "flow-through shares" (within the meaning of subsection 66(15) of the Tax Act (as defined below)) (the "FT Shares") at a price of $2.11 per FT Share for aggregate gross proceeds of $10,001,400, and (b) 6,665,733 non-flow-through common shares of the Company (the "HD Shares") at a price of $1.50 per HD Share for aggregate gross proceeds of $9,998,599.50, for total gross proceeds of $19,999,999.50 pursuant to the Offering, inclusive of the Option (as defined below). The Offering was led by Cormark Securities Inc., together with Canaccord Genuity Corp. on behalf of a syndicate of underwriters (collectively, the "Underwriters").

Vancouver, British Columbia--(Newsfile Corp. - September 17, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") is pleased to announce that, in connection with its previously announced $15,000,000 "bought deal" private placement, Cormark Securities Inc., together with Canaccord Genuity Corp. on behalf of a syndicate of underwriters (collectively, the "Underwriters"), have agreed with the Company to increase the size of the "bought deal" private placement by approximately $3,000,000 for gross aggregate proceeds of $18,000,000 (the "Offering"). The Company is also pleased to announce a concurrent non-brokered private placement priced at $2.43 per NB FT Share (as defined below) for gross aggregate proceeds of approximately $5,600,000 (the "Non-Brokered Private Placement"), involving strategic investors.

Drilling Confirms Vertical and Lateral Extensions of Argus North, Highlighting System Scale and Continuity Vancouver, British Columbia--(Newsfile Corp. - September 3, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") is pleased to announce additional drill results from the Company's ongoing 25,000 metre drill program (the "Program') at its 100% owned Munro-Croesus Project ("Munro-Croesus" or the "Project"), located 75 km east of Timmins, Ontario. Results are reported today for eight (8) step-out holes drilled on a cross-section located 50 metres west of the Argus North discovery section.

Continuity of New Argus North Zone now demonstrated over 100 Vertical Meters Vancouver, British Columbia--(Newsfile Corp. - June 26, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") is pleased to announce the first drill results of from the Company's 10,000-meter spring drill program (the "Program') at the Argus North Zone ("Argus North"), a newly identified gold zone located on its 100% owned Munro-Croesus Project ("Munro-Croesus" or the "Project"), 75 km east of Timmins, Ontario. Results are reported for two new step-out holes and the extension of two existing holes (Tables 1 and 2 and Figures 1 and 2).

Total Project Land Holdings Expanded to 109 km2 to cover Key Geological Real Estate Vancouver, British Columbia--(Newsfile Corp. - June 24, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) is pleased to announce that it has signed mineral property purchase and sale agreements (the "Purchase Agreements") with two separate arm's length private vendors through its wholly-owned subsidiary to acquire a 100% interest in the Munro property (the "Munro Property") and Hewitt property (the "Hewitt Property", and collectively with the Munro Property, the "Properties") located within and proximal to the company's 100% owned Munro-Croesus Project (the "Munro-Croesus Project" or the "Project"), 75 km east of Timmins, Ontario (Figure 1). These strategic acquisitions expand Onyx Gold's Munro-Croesus land package to 10,921 hectares (109 km²), further enhancing the Company's footprint and reinforcing its position as a leading gold explorer in the Timmins Camp.

Vancouver, British Columbia--(Newsfile Corp. - June 12, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx Gold" or the "Company") is pleased provide an update on its ongoing exploration efforts at its 100%-owned Munro-Croesus Project ("Munro-Croesus" or the "Project"), located 75 km east of Timmins, Ontario (Figure 1). Following strong momentum from the early 2025 drill campaign, Onyx Gold has added a second drill rig in May to accelerate its fully funded ~10,000-metre Phase 1 drill program.

Vancouver, British Columbia--(Newsfile Corp. - June 6, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx Gold" or the "Company") announces closing of the second and final tranche of its previously announced non-brokered private placement (the "Private Placement"). Pursuant to the second tranche of the Private Placement, the Company issued 1,709,657 common shares that qualify as "flow-through shares" (within the meaning of subsection 66(15) of Income Tax Act (Canada) (the "Tax Act")) (the "FT Shares") at a price of $1.19 per FT Share for aggregate gross proceeds of approximately $2.03 million.

Vancouver, British Columbia--(Newsfile Corp. - May 29, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") announces closing of the first tranche of its previously announced non-brokered private placement with a strategic investor (the "Private Placement") of 3,490,343 common shares of the Company ("Shares") at a price of $0.85 per Share for aggregate gross proceeds of approximately $3 million. The net proceeds of the first tranche of the Private Placement will be used by the Company for general corporate purposes.

Vancouver, British Columbia--(Newsfile Corp. - May 22, 2025) - Onyx Gold Corp. (TSXV: ONYX) (OTCQX: ONXGF) ("Onyx" or the "Company") announces closing of its previously announced $8,038,000 "bought deal" private placement (the "Offering") of (a) 5,000,000 common shares of the Company that qualify as "flow-through shares" (within the meaning of subsection 66(15) of the Tax Act (as defined below)) (the "Tranche 1 FT Shares") at a price of $1.00 per Tranche 1 FT Share for aggregate gross proceeds of $5,000,000, and (b) 3,100,000 common shares of the Company that qualify as "flow-through shares" (the "Tranche 2 FT Shares") at a price of $0.98 per Tranche 2 FT Share for aggregate gross proceeds of $3,038,000. The Offering was led by Cormark Securities Inc., together with Agentis Capital Markets Limited Partnership on behalf of a syndicate of underwriters (collectively, the "Underwriters").