Doré Copper Mining Corp. announced positive flotation test results at its Corner Bay high-grade copper-gold project located approximately 55 kilometers by road from the Corporation?s Copper Rand mill, near Chibougamau, Québec. This metallurgical test program is part of the work that is designed to support completion of a feasibility study for the implementation of a hub-and spoke operation model.

Key Highlights from ?Lock Cycle? Flotation Tests Excellent copper recoveries of 98.2% and 96.8% from a representative composite sample High-quality copper concentrate grades results of 27.0% and 29.6% The results are an improvement over the figures included in the May 2022 preliminary economic assessment (?PEA?), where the flotation recoveries for copper were 96.7% and the copper concentrate grade was 23.7%. All metallurgical tests completed to date support the effectiveness of utilizing ore sorting technology to improve the mill feed grade and reduce the mill feed tonnage resulting in a high-quality salable copper concentrate.

Metallurgical Test Work Program Summary Base Metallurgical Laboratories in Kamloops, British Columbia was commissioned to complete Corner Bay metallurgical development and locked cycle flotation testing in support of the feasibility study. A total of 34 diamond drill holes were used to create a spatially diverse composite sample (the ?CBSP? composite) that intersected copper mineralized zones within the Corner Bay Mineral Resource estimate.

The core material selected represented different rock types: semi and massive sulphides, quartz veins, diorite dyke, and fresh and altered anorthosite. The drill core was sampled by cutting a quarter split NQ core.   The CBSP composite was firstly compiled into a 202 kilogram sample with a grade of 2.20% Cu. The CBSP composite was then processed through the Steinert ore sorter and mixed with 26% of the unsorted underflow by-passed mineralized material to represent an overall sorted pre-concentrate mineralized material product.

The CBSP composite resulted in a 123 kilogram sample with a grade of 3.31% Cu. The composite sample was evaluated through lock cycle tests to determine the flotation metallurgical performance. The sample was prepared to a nominal grind size of 140 microns K80 in the rougher testing and then processed through a regrind size of approximately 37 microns K80 in the cleaner tests.

The sample responded consistently throughout the test work with excellent performance to conventional flotation processing methods and reagents. Two locked cycle tests were completed with varying retention times to determine the concentrate grade versus recovery. The tests resulted in concentrate grades of 27.0% Cu and 29.6% Cu and recoveries 98.2% and 96.8%, respectively.

Minimal amounts of deleterious elements (e.g. arsenic, antimony, bismuth, cadmium etc.) were present in the concentrate, indicative of the ?clean? nature of the concentrate. These results showed the highly commercial quality of the concentrate in terms of salability and payment terms of smelters.