Doré Copper Mining Corp. announced the first results from its 2021 drilling campaign totaling 16,500 meters at its Corner Bay property, located in the Chibougamau mining camp, approximately 40 kilometers by road from Chibougamau, Québec. As of April 30, 2021, Doré Copper has completed 17 holes totaling 13,250 meters and is reporting the results from 11 holes. Results to date from the 2021 drilling program has successfully continued to expand the copper-gold mineralization at Corner Bay, bringing the total strike of the mineralization to over 900 meters. The intercepts of holes CB-21-28, CB-21-29, and CB-21-32 have extended the Main Vein (below the diorite dyke) along strike to the south by approximately 200 meters from the 2020 drilling program. The high-grade copper intercept of 5.5 meters of 3.46% Cu (including 3.6 meters of 4.63% Cu) in CB-21-32 (southernmost hole for this part of the deposit) is located 380 meters south along strike from the 2019 mineral resource limit. The intercept in hole CB-21-32 also demonstrated that the "La Chib" fault, which limited the upper part of the deposit, does not limit the mineralization in the deeper part of the deposit and therefore opens up this part of the deposit along strike. The drilling program also tested the extension of the West Vein (located 400 meters west of the Main Vein) with four shallow holes. Note that two deeper holes testing the deeper part of the deposit did intersect the West Vein on the way down as well. The best intercepts included 4.0 meters of 2.31% Cu, 0.11 g/t Au, and 7.0 g/t Ag (hole CB-20-20) and 3.2 meters of 2.84% Cu, 0.32 g/t Au, and 6.25 g/t Ag (hole CB-21-22). The mineralization is approximately 200 meters from surface and extends for approximately 150 meters vertically and 200 meters along strike. Historic intercepts had defined a potential resource and the current drilling program is confirming the historic information. With these positive results, Doré Copper has expanded the drilling program to approximately 16,500 meters to test the mineralization further along strike and up-dip from hole CB-21-32 and to test the extension of the West Vein and East Vein (subparallel to the Main Vein). In the Main Vein above the dyke, Doré Copper completed five holes to infill the deposit as part of the upcoming mineral resource estimate. An increase in mineral resources is expected based on the mineralization intersected in the holes; assay results are pending. Another five drill holes were completed to test the potential northern extension of the Main Vein below the dyke and Deep Main Vein Lens. No significant mineralization was intersected. The Corner Bay deposit contains an Indicated resource of 1.35 Mt at an average grade of 3.01% Cu and 0.29 g/t Au, containing 89.8 million pounds of copper and 13,000 ounces of gold, and an Inferred resource of 1.66 Mt at an average grade of 3.84% Cu and 0.27 g/t Au, containing 140.3 million pounds of copper and 15,000 ounces of gold, assuming a cut-off grade of 1.5% Cu and a copper price of USD 3.25 per pound (Technical Report dated June 2019). The Corner Bay deposit is hosted by the intrusive Lac Doré Complex on the southern flank of the Chibougamau anticline. A regional north-northeastern diorite dyke also cuts the area. Several significant shear zones oriented north-south and northwest-southeast have been identified in the area. The Corner Bay area is characterized by copper porphyry style mineralization and by copper mineralization in shear zones commonly associated with dykes related to the Chibougamau Pluton. The Main Vein is oriented N10ºW dipping 75 to 85 degrees towards the west. To the north, the Main Vein is limited by one of the NW-SE structures while to the south it is open at depth across the "La Chib" fault. The mineralization varies from 15 centimeters to 8 meters thick, with an average thickness of 2.2 meters, located within a shear zone varying in width from 2 to 25 meters. The Main Vein below the dyke to the south is thicker and higher grade that the Main Vein above the dyke. The Main Vein lateral extension is now more than 900 meters and it remains open at depth down-dip and along strike.