Dore Copper Reports Excellent Concentrate Grades and Recoveries with Low Impurity Element Concentrations from Flotation Tests at Its Corner BAY Project
PRESS RELEASE
DORE COPPER REPORTS EXCELLENT CONCENTRATE GRADES AND
RECOVERIES WITH LOW IMPURITY ELEMENT CONCENTRATIONS FROM
FLOTATION TESTS AT ITS CORNER BAY PROJECT
Toronto, Ontario – October 30, 2023 – Doré Copper Mining Corp. (the "Company" or "Doré Copper")
(TSXV: DCMC; OTCQX: DRCMF; FRA: DCM) is pleased to announce positive flotation test results at its
flagship 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.
Ernest Mast, President & CEO, stated, "These flotation test results validate the favorable mineralogy of the
Corner Bay deposit for high performance ore sorting technology and conventional flotation to produce a
high-quality copper concentrate containing low levels of deleterious metals. These figures demonstrate the
robust nature of the processing plant flowsheet that will be used in the feasibility study.”
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 represent ed 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 w as 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.
2
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 grade s of
27.0% Cu and 29.6% Cu and recoveries 98.2% and 96.8%, respectively (see Table 1).
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 (see Table 2). These results showed the
highly commercial quality of the concentrate in terms of salability and payment terms of smelters.
Table 1. Metallurgical Test Work Results
Composite / Test Lock cycle test feed Concentrate Recovery
CBSP (sorted
mineralized material) Cu % Au g/t Ag g/t Cu % Au g/t Ag g/t Cu % Au % Ag %
Lock Cycle Test 1 3.31 0.30 9 27.0 1.82 68 98.2 72.1 86.4
Lock Cycle Test 2 3.28 0.55 10 29.6 3.24 72 96.8 62.6 76.9
Table 2. Impurity Element Content of Copper Concentrate
Composite / Test Impurity Elements (ppm)1
CBSP (sorted
mineralized material)
Arsenic
(As)
Antimony
(Sb)
Bismuth
(Bi)
Cadmium
(Cd)
Lead
(Pb)
Mercury
(Hg)
Zinc
(Zn)
Lock Cycle Test 1 22 3 4 10 102 1 735
Lock Cycle Test 2 10 3 3 10 88 1 777
1. All analyses in parts per million (ppm).
Technical Disclosure
All metallurgical test work referenced in this news release was completed by Base Metallurgical
Laboratories Ltd. (“BML”), based in Kamloops British Columbia, Canada.
Commercial certified standard material and blanks were inserted by BML into the sample chain accounting
for 10% of the samples as part of the quality assurance and quality control (QA/QC) program.
Qualified Person
Ernest Mast, P.Eng., President and CEO of the Corporation, and a "Qualified Person" 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.
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 mill 1. 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 gold 2.
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.
3
For further information, please contact:
Ernest Mast Laurie Gaborit
President and Chief Executive Officer Vice President, Investor Relations
Phone: (416) 792-2229 Phone: (416) 219-2049
Email: [email protected] Email: [email protected]
Visit: www.dorecopper.com
Facebook: Doré Copper Mining
LinkedIn: Doré Copper Mining Corp.
Twitter: @DoreCopper
Instagram: @DoreCopperMining
1. Technical report titled "Preliminary Economic Assessment for the Chibougamau Hub -and-Spoke Complex, Québec, Canada"
dated June 15, 2022, in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects. The Technical
Report was prepared by BBA Inc. with several consulting firms contributing to sections of the study, including SLR Consulting
(Canada) Ltd., SRK Consulting (Canada) Inc. and WSP Inc.
2. Sources for historic production figures: Economic Geology, v. 107, pp. 963 –989 - Structural and Stratigraphic Controls on
Magmatic, Volcanogenic, and Shear Zone -Hosted Mineralization in the Chapais -Chibougamau Mining Camp, Northeastern
Abitibi, Canada by F rançois Leclerc et al. (Lac Dore/Chibougamau mining camp) and NI 43 -101 Technical Report on the Joe
Mann Property dated January 11, 2016 by Geologica Groupe -Conseil Inc. for Jessie Ressources Inc. (Joe Mann mine). Doré
Ramp November 1992 Summary, internal Westminer Report.
Cautionary Note Regarding Forward-Looking Statements
This news release includes certain "forward -looking statements" under applicable Canadian securities legislation.
Forward-looking statements include predictions, projections and forecasts and are often, but not always, identified by
the use of words such a s "seek", "anticipate", "believe", "plan", "estimate", "forecast", "expect", "potential", "project",
"target", "schedule", "budget" and "intend" and statements that an event or result "may", "will", "should", "could" or
"might" occur or be achieved and oth er similar expressions and includes the negatives thereof. All statements other
than statements of historical fact included in this news release, including, without limitation, statements with respect to
the timing and ability of the Company to receive necessary regulatory approvals , the Company's ability to meet its
production target, the commencement, timing and completion of a feasibility study, and the plans, operations and
prospects of the Company and its properties are forward -looking statements. Forward -looking statements are
necessarily based upon a number of estimates and assumptions that, while considered reasonable, are subject to
known and unknown risks, uncertainties and other factors which may cause actual results and future events to differ
materially from those expressed or implied by such forward-looking statements. Such factors include, but are not limited
to, actual exploration results, changes in project parameters as plans continue t o be refined, future metal prices,
availability of capital and financing on acceptable terms, general economic, market or business conditions, uninsured
risks, regulatory changes, delays or inability to receive required regulatory approvals, health emergencies, pandemics
and other exploration or other risks detailed herein and from time to time in the filings made by the Company with
securities regulators. Although the Company has attempted to identify important factors that could cause actual actions,
events or results to differ from those described in forward -looking statements, there may be other factors that cause
such actions, events or results to differ materially from th ose anticipated. There can be no assurance that such
statements will prove to be accurate, as actual results and future events could differ materially from those anticipated
in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. The Company
disclaims any intention or obligation to update or revise any forward -looking statements, whether as a result of new
information, future events or otherwise, except as required by law.
Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the
policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this
news release.