Mr. Ernest Mast reports

DORE COPPER INCREASES SIZE OF ITS JOE MANN PROPERTY BY ACQUIRING A 65% INTEREST IN 3,030 HECTARES

Dore Copper Mining Corp. has exercised its right to acquire a 65-per-cent interest in certain claims subject to a joint venture with SOQUEM, which surround and are adjacent to the company's 100-per-cent-owned Joe Mann property, pursuant to an earn-in option agreement dated Jan. 2, 2020, as amended Oct. 28, 2022, between the company and Ressources Jessie Inc. SOQUEM holds the remaining 35-per-cent interest in the SOQUEM JV property.

In accordance with the terms of the option agreement, Ressources Jessie will transfer its 65-per-cent interest in the SOQUEM JV property, comprising 69 claims totalling 3,029.6 hectares, to the company for $300,000 in cash and 3,333,333 common shares of the company at a deemed price of 12 cents per common share, representing $400,000 in common shares. Following this acquisition, the company has a controlling interest in a contiguous group of claims totalling 6,209.2 ha surrounding the former high-grade Joe Mann gold mine and part of the southern Chibougamau camp where Northern Superior Resources Inc. and Iamgold Corp. have significant gold mineral resources.

The acquisition is subject to the acceptance of the TSX Venture Exchange. The common shares issued in connection with the acquisition are subject to a four-month hold period under applicable Canadian securities laws which will expire on May 23, 2024.

Ernest Mast, president and chief executive officer of Dore Copper, commented: "With this transaction, we have consolidated a large contiguous group of claims around the former Joe Mann mine in the prolific southern Chibougamau camp.

"Most of the SOQUEM JV block has not been explored since the late 1990s and numerous gold targets remain to be evaluated on the property. We are looking forward to work with SOQUEM and we plan to commence a detailed review of the historical work and use new geological interpretations to generate high-quality exploration targets."

Exploration potential on the SOQUEM JV property

The company's contiguous group of claims is located in the eastern part of the Abitibi greenstone belt within the upper part of the Obatogamau formation, within a major deformation corridor known as the Opawica-Guercheville shear zone. The company has a 100-per-cent interest in the former Joe Mann mine, which produced 1.12 million ounces of gold at an average grade of 8.26 grams per tonne from the 1950s to 2007. The deposit has an inferred mineral resource of 680,000 tonnes grading 6.78 g/t Au and 0.24 per cent copper, which was included in the company's preliminary economic assessment (PEA) of its hub-and-spoke operation announced on May 10, 2022.

The main lithologies encountered are basalts, rhyolites, gabbros, and several families of felsic, intermediate and mafic dikes. Two felsic intrusions, La Dauversiere and Verneuil, are found respectively to the northeast and northwest of the claim group. The stratigraphy is east-west, dipping subvertically, and metamorphosed to the upper greenschist facies (epidote-amphibolite facies).

A number of gold occurrences and mineralized zones have been identified on the SOQUEM JV property and are briefly summarized below. An evaluation of all the exploration work conducted on the SOQUEM JV will be completed over the coming months to identify exploration targets. No significant exploration work on the SOQUEM JV property has been carried out since the late 1990s, except for the Rohault and Norhart gold occurrences where the latest exploration activities took place in 2004.

Rohault

The Rohault gold occurrence is located north of the former Joe Mann mine and its western extension is located approximately 300 metres north of the mine infrastructures. This structure has been tested by drilling over a two-kilometre strike length. The Rohault mineralized zone is characterized by quartz-carbonate veins and veinlets which cut mafic lavas and intrusions. The main occurrence contains approximately 15 per cent pyrite and 5 per cent chalcopyrite with several interesting historical drill intercepts: 108.71 g/t Au, 16.85 g/t silver and 1.4 per cent Cu over 0.6 metre at a downhole depth of 44.95 metres (H-560) and 6.32 g/t Au and 0.37 per cent Cu over 3.6 metres (including 34.5 g/t Au and 0.99 per cent Cu over 0.6 metre) at a downhole depth of 79.2 metres (H-518).

Norhart

The Norhart gold occurrence is located approximately one kilometre north of former Joe Mann mine. The gold mineralization shows similar characteristics to Joe Mann. It comprises five parallel quartz vein structures, separated by between 50 and 150 metres over a strike length of approximately 500 metres. Gold mineralization is within quartz veins cutting strongly altered granular felsic dikes or basalts.

Significant historical drill intercepts in the sector of Norhart include: 65.85 g/t Au, 5.9 g/t Ag over 6.34 metres at a downhole depth of 207.46 metres (H-04-579); 160.50 g/t Au, 9.8 g/t Ag over 0.85 metre at a downhole depth of 235 metres (H-04-582); 81 g/t Au, 1.4 g/t Ag over 1.2 metres at a downhole depth of 234.8 metres (H-04-580); 24.65 g/t Au, 17.48 g/t Ag, 0.79 per cent Cu over 1.92 metres at a downhole depth of 256.62 metres (H-04-578), 99.64 g/t Au, 11.8 g/t Ag and 0.12 per cent Cu over 0.3 metre at a downhole depth of 283.85 metres (H-569); 10.04 g/t Au, 16.3 g/t Ag and 0.11 per cent Cu over 1.2 metres at a downhole depth of 521.2 metres (H-535 EXT); 57.65 g/t Au over 0.40 metre at a downhole depth of 264 metres (H-550).

Currie-Mills

The Currie Mills (Lac James) gold occurrence is located three kilometres east-northeast of the former Joe Mann mine. The mineralized system is parallel to Joe Mann and contains a small historical near-surface resource (not compliant with National Instrument 43-101). Mineralization consists of two lenses (north and south) of disseminated chalcopyrite, pyrite, pyrrhotite and arsenopyrite in centimetric to decimetric quartz-carbonate veins with locally some specks of free gold with altered and sheared non-magnetic coarse gabbros. One significant historical drill hole intercept of 3.9 g/t Au over 6.9 metres at a downhole depth of 61 metres (VM87-07) is located 150 metres east of the historical resource.

Lac Meston

The Lac Meston gold occurrence is located 4.8 kilometres southwest of the former Joe Mann mine. The mineralization is found in a tonalite intrusion. An underground ramp of 305 metres was built in 1974 but did not access the mineralized zone. Significant historical drill hole intercepts include: 18.49 g/t Au over 3.61 metres (M-81-09), 34.21 g/t Au over 1.55 metres (A-12) and 6.92 g/t Au over 6.10 metres (A-14), all of which were at less than 100 metres depth.

Adnor

The Adnor mineralized zone, located three kilometres west of Joe Mann, consists of a number of east-west subparallel veins within a sequence of pillowed massive basaltic flows injected by a variety of small felsic dikes. A significant drilling campaign was conducted in the early 1950s to define the mineralized zone. The highest drill intercept returned 2,297 g/t Au over 0.30 m (A-10). A subsequent drilling program in the early 1970s returned the following significant results: 14.40 g/t Au over 0.3 metre (N-7-2); 6.86 g/t Au over 0.6 metre (N-6); and 4.80 g/t Au over 1.5 metres (N-7). Highlight from the subsequent late 1980s drilling program include 11.04 g/t over 3.05 metres (H-380).

Noranda -- La Dauversiere

This mineral occurrence is located approximately 3.5 kilometres east of Joe Mann. Gold mineralization is found in quartz carbonate veins with pyrrhotite-pyrite and chalcopyrite within sheared and altered gabbro. A number of diamond drill holes were completed by several companies prior to the late 1990s and significant results included: 8.16 g/t Au, 2.4 g/t Ag and 0.16 per cent Cu over 0.55 metre (H-223); and 12.3 g/t Au over 1.02 metres (VM-89-26).

Montgomery

This mineral showing is located approximately two kilometres west of Joe Mann. Gold mineralization is found in quartz veins containing varying amounts of pyrite, scheelite, chalcopyrite and local visible gold within a sheared structure covering a strike length of 475 metres and up to eight metres wide. Significant historical intersections include: 4.41 g/t Au over 0.27 metre (M-7); 106.10 g/t Au (trench No. 1 channel sample); 13.56 g/t Au (trench No. 2 channel sample); and 199.66 g/t Au (trench No. 4 channel sample).

Wright Hargreaves

The mineral showing (also known as Fancamp) is located 500 metres southwest of the Adnor showing. Gold mineralization is erratic and associated with less than one metre quartz-carbonate plus/minus tourmaline veins and veinlets with auriferous pyrite in massive and pillowed basalts and co-magmatic magnetic gabbro-sills. Historical trench results include 9.88 g/t Au over one metre and 6.05 g/t Au over one metre. The only significant highlight from the latest drilling program (1980s) include 4.50 g/t over 0.60 metre (87-1).

Lac Antoine

Located near the southwest boundary of the property, the Lac Antoine gold mineralization is associated with northeast-trending quartz-carbonate veins containing up to 15 per cent pyrite and minor chalcopyrite within pillow basalts. Historical work only reports high-grade gold assays (10 to over 30 g/t Au) from grab samples.

Bloc Sud

Located near the southwest boundary of the property, the Bloc Sud gold mineralization consists of black quartz veins (plus/minus sulphides) within a chlorite-sericite-ankerite schist of decametric width at the contact of a basalt-tonalite dike. An intercept of 1.96 g/t Au over 6.25 metres, including 6.98 g/t Au over 1.35 metres (H-507), was reported from a limited drilling campaign.

Qualified person

Sylvain Lepine, MSc, PGeo, vice-president, exploration, of the company and a qualified person within the meaning of National Instrument 43-101 -0 Standards of Disclosure for Mineral Projects, has reviewed and approved the scientific and technical information contained in this news release.

About Dore Copper Mining Corp.

Dore Copper Mining aims to be the next copper producer in Quebec with an initial production target of over 50 million pounds of copper equivalent annually by implementing a hub-and-spoke operation model with multiple high-grade copper-gold assets feeding its centralized Copper Rand mill. The company delivered its PEA in May, 2022, and is proceeding with a feasibility study.

The company has consolidated a large land package in the prolific Lac Dore/Chibougamau and Joe Mann mining camps that has historically produced 1.6 billion pounds of copper and 4.4 million ounces of gold. The land package includes 13 former producing mines, deposits and resource target areas within a 60-kilometre radius of the company's Copper Rand mill.

We seek Safe Harbor.