Doré Copper Mining Corp. announced an updated mineral resource estimate (“MRE”) for its Devlin copper project. The Devlin deposit is easily accessible, partially developed and located approximately 10 kilometers west of the Corporation’s Corner Bay project and approximately 35 kilometers by road from the Corporation’s Copper Rand mill, near Chibougamau, Québec. The preliminary economic assessment (“PEA”) for the hub-and-spoke operation model, which includes the Corner Bay deposit as the main feed to the mill along with the Devlin deposit and the former Joe Mann mine as secondary feed sources, is expected to be completed by January 2022. Measured and Indicated Resource of 775,000 tonnes at 2.17% Cu and Inferred Resource of 484,000 tonnes at 1.79% Cu, Contains 37 million pounds of copper in the Measured and Indicated categories and 19 million pounds of copper in the Inferred category, Flat-lying deposit less than 100 meters from surface. Infrastructure in place: 305-meter decline access to a vertical depth of 70 meters and Within trucking distance (35 kilometres) of the Corporation’s 2,700 tpd mill. Development plan contiguous with Corner Bay benefiting from operational synergies. Included in the PEA anticipated in January 2022. The MRE utilized a combination of historic holes drilled from 1974 to 1982 and more recent drilling by Nuinsco (CBay Minerals Inc.) from 2013-14. A total of 140 drill holes (out of 174) were used for this MRE with an aggregated length of 14,924 meters. No additional drilling was completed at Devlin since 2014 except for a few holes for metallurgical testing by Doré Copper during summer 2021. SLR’s mineral resource update is based on the previous MRE, dated June 30, 2015, that was prepared by Pierre Desautels, P.Geo., of AGP Mining Consultants Inc. (“AGP”) using Gemcom GEMS Version 6.5 software. A block model was built by AGP based on 140 diamond drill holes that intersect the Lower Zone and Upper Zone wireframes. The mineralization wireframes were built by AGP based on a 1.8 meters minimum mining height. Assays were capped to 15% Cu and 2.5 g/t Au in the Lower Zone and were capped to 10% Cu and 1.5 g/t Au in the Upper Zone. Full intersect copper and gold composites were interpolated into 10 meters by 10 meters by 2.5 meters high partial blocks using a three pass, inverse distance squared (ID2) estimation approach. AGP reported the resources base on a 1.6% Cu cut-off grade. SLR reviewed and adopted the AGP block model after making modifications to the classification model whereby the Measured blocks were preserved and a portion of the Inferred blocks were upgraded to Indicated. SLR’s MRE dated October 7, 2021 is based on a 1.2% Cu cut-off grade. The Devlin deposit is a flat-lying (horizontal) magmatic massive sulphide deposit which is less than 100 meters from surface. The deposit is mainly hosted by a hydrothermal breccia. It is composed of a massive chalcopyrite-pyrite-quartz +/- carbonate vein which pinches and swells. Minor gold is present within the ore body with values typically less than 0.34 g/t. High grade intersections usually consist of one or several parallel quartz veins varying from a few centimeters to 1 meter in thickness, in which the occurrence of chalcopyrite may vary from occasional blebby specks to massive bands. As the mineralogy is very similar to the Corner Bay deposit, the Corporation expects no issues in comingling material from both projects. The Devlin deposit was drilled by Riocanex (1974-78) and Camchib Resources Inc. (1979-82). In 1981, a 305-meter access decline of 11 ft. x 15 ft. was driven at -15% to a vertical depth of 70 meters, intersecting mineralization at approximately 55 meters below surface. An additional 305 meters of exploration drifting was completed along the vein confirming the continuity and grade of the copper zone. A bulk sample totaling 2,744 short tons of development muck was processed at the Principale mill (dismantled). From an average head grade of 1.26% Cu, a copper concentrate grading 17.79% Cu was obtained with an overall copper recovery of 96.9%. In 1995, Holmer Gold (55% owner of the property) retains Watts Griffis and McOuat Limited (“WGM”) to prepare a technical review of the project. WGM developed a mine plan suggesting a room and pillar approach with a mining rate of 200 tons per day for a total annual production of 50,000 short tons over a mine life of four years. In 2004, Lake Shore Gold acquired Holmer Gold and the Devlin property. The Devlin property was acquired by CBay Minerals Inc. in 2013. CBay Minerals completed 1,749 meters of drilling in 17 holes from 2013-14. In 2015, CBay Minerals reported a NI 43-101 MRE and filed a Technical Report for the Devlin project.