Mr. Greg Ferron reports

PLATINEX INTERSECTS WIDESPREAD GOLD MINERALIZATION IN MAIDEN DRILL PROGRAM AT HEENAN INCLUDING 77.44 M OF 0.40 G/T AU AND 27.15 M OF 0.55 G/T AND ANNOUNCES BOARD REORGANIZATION

Platinex Inc. has released results from the first phase of diamond drilling on the Heenan property, part of the Heenan Mallard gold project located in the Swayze greenstone belt of the Abitibi, Northeastern Ontario, and held through the South Timmins Mining joint venture with Fancamp Exploration Ltd.

Highlights:

• The program totalled 611.50 metres with three drill holes completed over 50 m spacing and one undercut hole. All cross-sections for the four holes are on the website.
• Several consistent wide zones of gold mineralization intersected from surface to 177 m, including:
  • 77.44 m of 0.40 gram per tonne Au in hole HE23-02;
  • 27.15 m of 0.55 g/t Au in hole HE-23-03 with higher-grade intercepts within;
  • An additional zone of mineralization, outside of the iron formation, was encountered in hole 2 grading 5.53 g/t over one m at 177 m.
• The drill program is the first drill program completed on the project and was focused on results obtained from past geochemical and prospecting programs, including those from the mechanized stripping program completed in Q4 2023 that discovered gold occurrences in two channel sample composites, including 4.05 g/t Au over two m, and 2.39 g/t Au over eight m in Trench 2.
• Gold mineralization is hosted mainly within the Woman River iron formation and is associated with pyrite mineralization, alteration and minor quartz veining.
• The Heenan Mallard property is located along the northwest border of Iamgold's Cote gold project, which is set to commence production in March, 2024, and southeast of Evolution Mining's October gold project.

"We are encouraged with the results of the maiden drill program at Heenan which was not only completed successfully but also on budget," said Greg Ferron, president and chief executive officer of Platinex. "The distribution of gold mineralization is widespread and intersected gold in all four holes across a 100-metre strike length, demonstrating the potential of this emerging gold project."

The property is located in Heenan and Benton townships lying within the Swayze area of the Abitibi greenstone belt and is found on the fold nose of the Woman River iron formation, a high-magnetic and structural target considered favourable for gold mineralization.

The South Timmins joint venture plans to continue its systematic approach to exploring the South Timmins JV properties and to follow up on this greenfield discovery at Heenan.

Program summary

During the months of December, 2023, and January, 2024, four diamond drill holes totalling 611.50 m were completed. Drill hole HE23-01 was collared to drill underneath the surface mineralization encountered in Trench 2. The drill hole intersected numerous zones of gold mineralization, including:

• 0.64 g/t Au over a sampled length of five m;
• 0.27 g/t Au over a sampled length of 13.20 m;
• 2.07 g/t Au over a sampled length of one m.

Drill hole HE23-02 was collared approximately 50 m grid east to test the strike length of the Woman River gold zone southeast of Trench 2. The drill hole intersected:

• 0.40 g/t Au over a sampled length of 77.44 m, including higher-grade intercepts such as 1.64 g/t Au over a sampled length of four m;
• 2.08 g/t Au over a sampled length of 1.20 m;
• 2.20 g/t Au over a sampled length of 0.60 m;
• 5.53 g/t Au over a sampled length of one m.

Drill hole HE24-03 was collared 50 m grid east of HE23-02 to test surface mineralization encountered from prospecting in Trench 1. The drill hole intersected:

• 0.55 g/t Au over a sampled length of 27.15 m, including 3.18 g/t Au over a sampled length of 0.40 m;
• 1.16 g/t Au over a sampled length of 6.70 m.

Drill hole HE24-04 was collared underneath HE23-01 at a steeper inclination and intersected anomalous gold throughout the hole, with the best intercept:

• One g/t Au over a sampled length of three m.

Quality assurance/quality control program

Samples were cut using a diamond blade saw, inserted into labelled bags and delivered by representatives of Platinex to Activation Laboratories Ltd. in North Bay, Ont. Activation Laboratories is an ISO 17025:2005 accredited testing laboratory.

Samples were analyzed by fire assay using the 1A2 package with a gravimetric finish (1A3 package) for samples that returned greater than 5,000 parts per billion Au. Platinex inserted standards and blanks and performs duplicate analysis as part of its QA/QC program. Activation Laboratories also performs an internal QA/QC program which includes the insertion of certified reference materials, blanks, sample repeats and duplicate samples.

Chairman of the board update

Platinex is pleased to announce the appointment of Christophe Vereecke as interim chairman. Mr. Vereecke has been a director of Platinex since February, 2021. He brings sophisticated experience in global financial markets and offers vision and skills necessary to assist with enhancing the best corporate strategy that prioritizes the interests of all stakeholders. His predecessor, James Trusler, who has fostered the company for over two decades, will continue as a director on the board, as well as a technical adviser.

Qualified person

The technical information presented in this news release has been reviewed and approved Joerg Kleinboeck, PGeo, a qualified person as defined by National Instrument 43-101 Standards of Disclosure for Mineral Projects.

About South Timmins Mining Inc.

South Timmins is a joint venture in which Platinex holds a 75-per-cent interest and Fancamp Exploration holds a 25-per-cent interest. The South Timmins properties include the Shining Tree, Heenan and Mallard gold projects, all of which lie along the Ridout-Tyrrell deformation zone (RTDZ), which also hosts Iamgold's Cote gold project and Aris Mining's Juby deposit. The combined South Timmins land packages total over 285 square kilometres, which is one of the largest landholdings in the region.

Following a property review and exploration planning process, South Timmins JV commenced operations in May, 2023. Exploration work carried out to date has included geochemical soil sampling (B-horizon), prospecting and mechanized stripping at Heenan and Shining Tree, with drilling at Heenan to commence upon the completion of initial exploration activities (see press release Aug. 1, 2023).

About Platinex Inc.

Platinex creates shareholder value through the opportunistic acquisition and advancement of high-quality projects in prolific Ontario mining camps. Current assets include a 100-per-cent ownership interest in the W2 copper-nickel-platinum-group-element project near the Ring of Fire in Northern Ontario and a 75-per-cent interest in the South Timmins Mining joint venture with Fancamp Exploration, which is focused on gold exploration along the Ridout-Tyrrell deformation zone near Iamgold's Cote gold operation in the southwest Abitibi. Platinex also holds majority ownership in Green Canada Corp., which holds uranium assets in Saskatchewan, Ontario and Quebec, as well as an option to earn as a 100-per-cent ownership interest in the Muskrat Dam critical minerals project in Northwestern Ontario. In addition to its mineral exploration assets, Platinex holds a portfolio of net smelter return (NSR) royalties on gold, PGE and base metal properties in Ontario.

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