Dore Copper Confirms Copper Mineralization on its Cedar Bay Southwest Extension
Press Release
Toronto, Ontario – July 24, 2024 – Doré Copper Mining Corp. (the “Company” or “Doré Copper“) (TSXV: DCMC; OTCQB: DRCMF; FRA: DCM) completed two drill holes totaling 1,392 meters which successfully extended the Southwest Zone of the former Cedar Bay copper-gold mine located in the Chibougamau mining camp, approximately 5 kilometers by road from its Copper Rand mill.
The Southwest Zone is located 300 meters to the southwest of the Cedar Bay mine Main Zone and was partially developed in late 1960s by Campbell Chibougamau Mines Limited (“Campbell”) on two levels (114 meters and 200 meters) right to the property limit with Patino Mining. The best results of Campbell’s drilling campaign in the Southwest Zone included 5.2 meters of 2.56% Cu and 3.9 meters of 2.22% Cu and 1.3 g/t Au1. 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 meters of strike length had not been tested up to the Lac Doré Fault.
The two drill holes completed by Doré 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 meters of 1.06% Cu and 20.7 g/t Ag, including 0.6 meter of 2.82% Cu, 54.8 g/t Ag and 0.33 g/t Au, at a vertical depth of 414 meters. 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 meters (true width) characterized by pervasive black chlorite and carbonate veining alteration starting at a vertical depth of 449 meters. Copper mineralization was intersected at a vertical depth of 541 meters with 0.40 meter of 1.70% 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 Doré 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 downhole 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 meters of strike length untested towards the Doré Lake Fault.
Doré Copper received a grant from the Government of Québec of approximately C$182,000 towards 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 à l’exploration minière pour les minéraux critiques et stratégiques 20212024 or PSEM-MCS), which is overseen by the Ministry of Natural Resources and Forests (Ministère des Ressources naturelles et des Forêts or MRNF).
Ernest Mast, President and CEO of Doré Copper, commented, “We have confirmed the extension of the Cedar Bay Southwest structure towards the Lac Doré fault in two drill holes, including 1.6 meters of 1.06% 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 Doré Copper’s Copper Rand and Cedar Bay mines. The next step is to conduct a downhole 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 Québec 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% Cu and 3.22 g/t Au2. The ore from the mine was processed at the Copper Rand mill located 5 kilometers by road. The deposit was mined to a depth of 670.5 meters and the existing shaft extends to a depth of 1,036 meters.
Doré Copper completed four holes (including wedges) totaling 4,842 meters in 2018 and reported an Indicated resource of 130,000 tonnes at 9.44 g/t Au and 1.55% Cu, and an Inferred resource of 230,000 tonnes at 8.32 g/t Au and 2.13% Cu (effective date of December 31, 2018)3. During 2020, the Corporation completed 9,025 meters of drilling and successfully extended a number of mineralized lenses (the 10-20A and 10-20B).
Table 1. Assays Highlights from the 2024 Drill Program at Cedar Bay SW Extension
| Hole | Azimuth/ Dip | From (m) | To (m) | Width1 (m) | Au (g/t) | Ag (g/t) | Cu (%) | Zone |
| CDR-24-09 | 227°/47° | 97.0 | 97.7 | 0.70 | 1.95 | 9.90 | 0.22 | unknown |
| 200.4 | 201.0 | 0.60 | 1.42 | 2.10 | 0.11 | unknown | ||
| 575.3 | 576.9 | 1.60 | 0.12 | 20.68 | 1.06 | SW1 | ||
| Including | 575.7 | 576.3 | 0.60 | 0.33 | 54.80 | 2.82 | SW1 | |
| CDR-24-10 | 190°/47° | 757.2 | 757.6 | 0.40 | 2.03 | 1.50 | 1.70 | SW2 |
| 762.0 | 762.7 | 0.70 | 1.27 | 0.35 | 0.16 | unknown |
1The true width of the structures intersected is estimated at approximately 65-80% of the downhole width for Cedar Bay SW Extension.
Figure 1. Plan View of Copper Rand Property Showing the Cedar Bay SW Target
Figure 2. Plan View and Long Section Showing the Cedar Bay Southwest Zone Extension
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, Québec, and ICP multi-elements analysis was done at ALS in Vancouver, B.C. Samples were weighed, dried, crushed to 70% passing 2 mm, split to 250 g, and pulverized to 85% passing 75 microns. Samples are fire assayed for gold (Au) (50 g) and Aqua Regia ICP-AES finish for key elements (Ag, Cu, Mo). Samples assaying >10.0 g/t Au are re-analyzed with a gravimetric finish using a 50 g charge.
QA/QC is done in house by Doré Copper geologists with oversight from the Senior Geologist. The check samples (blanks and standards – 4% of total samples with another 2% 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 3 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 re-assayed.
Youssouf Ahmadou, M.Sc., P.Geo., 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 Doré Copper Mining Corp.
Doré Copper Mining Corp. aims to be the next copper producer in Québec with an initial production target of +50 Mlbs of copper equivalent annually by implementing a hub-and-spoke operation model with multiple high-grade copper-gold assets feeding its centralized Copper Rand mill3.The Company has 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 Doré/Chibougamau and Joe Mann mining camps that has historically produced 1.6 billion pounds of copper and 4.4 million ounces of gold2.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.
For further information, please contact:
Ernest Mast
President and Chief Executive Officer
Phone: (416) 792-2229
Email: emast@dorecopper.com
Laurie Gaborit
VP Investor Relations
Phone: (416) 219-2049
Email: lgaborit@dorecopper.com
For more information, please visit: www.dorecopper.com
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LinkedIn: Doré Copper Mining Corp.
Twitter: @DoreCopper
Instagram: @DoreCopperMining
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