Mr. Ernest Mast reports

DORE COPPER CONFIRMS COPPER MINERALIZATION ON ITS CEDAR BAY SOUTHWEST EXTENSION

Dore Copper Mining Corp. has completed two drill holes totalling 1,392 metres which successfully extended the Southwest zone of the former Cedar Bay copper-gold mine located in the Chibougamau mining camp, approximately five kilometres by road from its Copper Rand mill.

The Southwest zone is located 300 metres to the southwest of the Cedar Bay mine Main zone and was partially developed in late 1960s by Campbell Chibougamau Mines Ltd. on two levels (114 metres and 200 metres) right to the property limit with Patino Mining. The best results of Campbell's drilling campaign in the Southwest zone included 5.2 metres of 2.56 per cent Cu (copper) and 3.9 metres of 2.22 per cent Cu and 1.3 g/t (grams per tonne) Au (gold). The potential extension of the Cedar Bay Southwest zone along strike to the southeast was never tested by Patino Mining and subsequent companies that controlled that ground. In total, approximately 1,080 metres of strike length had not been tested up to the Lac Dore fault.

The two drill holes completed by Dore Copper targeting the Southwest zone to the southeast intersected two zones of copper mineralization within strong ductile shear zones with intense hydrothermal alteration. Hole CDR-24-09 intersected 1.6 metres of 1.06 per cent Cu and 20.7 g/t Ag, including 0.6 metre of 2.82 per cent Cu, 54.8 g/t Ag and 0.33 g/t Au, at a vertical depth of 414 metres. The mineralized intersection is characterized by strong pervasive carbonate-chlorite-sericite alteration with banded semi-massive chalcopyrite and pyrrhotite associated with quartz veinlets. Hole CDR-24-10 intersected a wide shear structure of 130-plus metres (true width) characterized by pervasive black chlorite and carbonate veining alteration starting at a vertical depth of 449 metres. Copper mineralization was intersected at a vertical depth of 541 metres with 0.40 metre of 1.70 per cent Cu and 2.03 g/t Au, characterized by chalcopyrite disseminations and blebs in a discontinuous massive iron-oxide band. The strong alteration footprint intersected in hole CDR-24-10 in the anorthosite to gabbroic rocks is characteristic of the Dore Lake complex magmatic-hydrothermal system and is interpreted to be an indicator of proximity to mineralized ore bodies of the Cu-Au central mining camp.

The company plans to conduct down hole geophysics to locate stronger conductors near and along the structure as the first hole may not have crossed it. The strong alteration footprint intersected in the second hole is promising as it indicates approximately 400 metres of strike length untested towards the Dore Lake fault.

Dore Copper received a grant from the government of Quebec of approximately $182,000 toward the drilling program and geometallurgical characterization. The grant has been offered under the mineral exploration support program for critical and strategic minerals (programme de soutien a l'exploration miniere pour les mineraux critiques et strategiques 2021-2024 or PSEM-MCS), which is overseen by the Ministry of Natural Resources and Forests (Ministere des Ressources naturelles et des Forets or MRNF).

Ernest Mast, president and chief executive officer of Dore Copper, commented: "We have confirmed the extension of the Cedar Bay Southwest structure towards the Lac Dore fault in two drill holes, including 1.6 metres of 1.06 per cent Cu and 20.7 g/t Ag. We are very excited by the strong alteration in a wide shear zone characteristic of the large copper-gold ore bodies in the camp, including Dore Copper's Copper Rand and Cedar Bay mines. The next step is to conduct a down-hole geophysical survey (pulse EM) to identify the potential for larger mineralized zones along the structure followed by additional drilling. We would also like to thank the government of Quebec for exploration grant and their support to develop the critical and strategic minerals industry within the province."

Cedar Bay mine

The Cedar Bay mine operated from 1958 to 1990 and produced 3.9 million tonnes grading 1.56 per cent Cu and 3.22 g/t Au. The ore from the mine was processed at the Copper Rand mill located five kilometres by road. The deposit was mined to a depth of 670.5 metres and the existing shaft extends to a depth of 1,036 metres.

Dore Copper completed four holes (including wedges) totalling 4,842 metres in 2018 and reported an indicated resource of 130,000 tonnes at 9.44 g/t Au and 1.55 per cent Cu, and an inferred resource of 230,000 tonnes at 8.32 g/t Au and 2.13 per cent Cu (effective date of Dec. 31, 2018). During 2020, the corporation completed 9,025 metres of drilling and successfully extended a number of mineralized lenses (the 10-20A and 10-20B).

Drilling and quality control

The company is using Miikan Drilling as the drilling contractor. Miikan is a joint venture between Chibougamau Diamond Drilling Ltd., the first nations community of Ouje-Bougoumou and the first nations community of Mistissini both located in the Eeyou Istchee territory.

Sample (HQ size half core) preparation and fire assay analysis were done at ALS Canada Ltd. (ALS) in Val d'Or, Que., and ICP multielements analysis was done at ALS in Vancouver, B.C. Samples were weighed, dried, crushed to 70 per cent passing two millimetres, split to 250 g and pulverized to 85 per cent passing 75 micrometres. Samples are fire assayed for gold (Au) (50 g) and aqua regia ICP-AES finish for key elements (Ag, Cu, Mo). Samples assaying greater than 10.0 g/t Au are reanalyzed with a gravimetric finish using a 50 g charge.

QA/QC is done in house by Dore Copper geologists with oversight from the senior geologist. The check samples (blanks and standards -- 4 per cent of total samples with another 2 per cent of core duplicates taken on half split core) that were inserted into the sample batches are verified against their certified values and are deemed a pass if they are within three standard deviations of the certified value. The duplicates are evaluated against each other to determine mineralization distribution (nugget). If there are large discrepancies in the check samples, then the entire batch is requested to be reassayed.

Youssouf Ahmadou, MSc, PGeo, senior exploration geologist of the company and a QP within the meaning of National Instrument 43-101 -- Standards of Disclosure for Mineral Projects, has reviewed and approved the scientific and technical information contained in this news release.

The qualified person (QP) for the company has not verified the historical sample analytical data disclosed within this release. While the company has obtained all historic records including analytical data from the previous owners of the property and from various government databases, the company has not independently verified the results of the historic sampling.

About Dore Copper Mining Corp.

Dore Copper Mining aims to be the next copper producer in Quebec with an initial production target of plus 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 has delivered its PEA (preliminary economic assessment) 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.

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