Dore Copper Announces Positive Results from ORE Sorting Tests at Corner BAY
PRESS RELEASE
DORE COPPER ANNOUNCES POSITIVE RESULTS FROM ORE SORTING TESTS
AT CORNER BAY
Toronto, Ontario – April 18, 2023 – Doré Copper Mining Corp. (the "Company" or "Doré Copper") (TSXV:
DCMC; OTCQX: DRCMF; FRA: DCM) is pleased to announce positive results from ore sorting test work
for 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.
Steinert was commissioned to complete ore sorting tests at their facility in Kentucky , United States, using
a XRT sensor (X-ray transmission) and a laser sensor on a spatially diverse sample from the Corner Bay
deposit.
The results support the first ore sorting test work that was completed for the preliminary economic
assessment (“PEA”) and further confirm the effectiveness of utilizing ore sorting technology to improve the
processed grade and reduce the mill feed tonnage.
Highlights of Ore Sorting Test
• Copper grade increase of 77%, from 2.20% to 3.93%
• Recovery of 93.6% Cu
• Reject material contains 48% of the initial mass with a copper grade of 0.30%
• Gold, silver and molybdenum grade also upgraded with excellent recoveries and low concentration
in reject
• Cost and environmental benefits include:
• Lower transportation costs and greenhouse gas emissions (GHGs) due to a reduction of
transported material from the mine to the mill
• Lower energy consumption at the mill due to higher feed grade and hardness decrease of the
feed material
• Less tailings produced
• Additional capacity of the mill to treat additional materials
• Waste material at the mine site (reject material) to be used as backfill
Commenting on the results of our second ore sorting tests, Ernest Mast, President & CEO, stated, "This
test work further validates the favorable mineralogy of the Corner Bay deposit for ore sorting technology
and confirms the prior ore sorting results obtained from the Corner Bay stockpile, which were included in
the PEA. Preliminary ore sorting test work at Devlin in 2022, our secondary hub-and-spoke asset, had also
indicated positive results. Ore sorting of the Corner Bay and Devlin will remain part of any future
development scenarios due to its economic and sustainability benefits.
Ore Sorting Tests
As a first step, the Steinert XRT was calibrated with high, medium and low grade and waste samples
representative of the selected drill core samples of the Corner Bay deposit (Figure 1) . A continuous
production run was done on the 202 kg sample. The testing was done with three passes with the explicit
aim of generating grade vs recovery vs mass pull curves, with each pass related to an adjustment in the
sensitivity. Results are shown in the table below.
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The sum of the two pre-concentrates (Test 2 in table below) represented 52.5% of the feed mass at a grade
of 3.93% Cu (an increase of 77%) and resulted in a cumulative copper recovery of 93.6%. The final reject
portion represented 47.5% of the feed mass at a grade of 0.30% Cu, representing 6.4% of the copper fed
in the sorter. In addition, all other metals to be recovered (gold, silver and molybdenum) showed an upgrade
in grade:
• Gold grade: from 0.17 g/t to 0.29 g/t
• Silver grade: from 7.91 g/t to 13.82 g/t
• Molybdenum grade: from 0.037% to 0.064%
Lastly, the arsenic grade of the two pre -concentrates was found to be 12ppm which lead s to a final
concentrate with very low levels of arsenic.
Minimal fines were generated in the test work and were not considered for calculations. In practice, the fine
material from the mining and crushing would join the pre -concentrate in the ore sorting circuit and would
result in a higher recovery than indicated in the test work. In addition, as the sorter can be calibrated to
control the final reject grade, a higher copper feed grade would result in higher recoveries.
Corner Bay Ore Sorting Results Cumulative Results
Result
(cumulative)
Weight
(kg)
Mass
Recovery
Cu
(%)
Cu
Rec.
Au
(g/t)
Au
Rec.
Ag
(g/t)
Ag
Rec.
Mo
(%)
Mo
Rec.
1 70 34.7% 5.18 81.4% 0.37 77.2% 17.90 78.4% 0.082 77.2%
2 106 52.5% 3.93 93.5% 0.29 92.2% 13.82 91.7% 0.064 91.7%
3 175 86.6% 2.52 99.0% 0.19 98.4% 9.00 98.6% 0.042 98.2%
4 202 100.0% 2.20 100.0% 0.17 100.0% 7.91 100.0% 0.037 100.0%
Corner Bay Composite Sample
A spatially diverse composite sample was prepared by Doré Copper by selecting 34 diamond drill holes
which intersected mineralized zones within the Corner Bay Mineral Resource estimate (“MRE”) (Figure 1;
one mineralized sample was outside the current MRE). 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 longer pieces of quarter split core were further
manually broken down into 1 to 3 inches length to simulate a crushed product. The composite sample
weighted 202 kg and graded 2.20% Cu (Test 4 in table above) and included an 18% external mining dilution
from the hanging wall and foot wall of the mineralized interval.
The PEA did not include the silver and moly bdenum content (currently excluded from the MRE). The
composite sample indicated silver and molybdenum grades that would be expected in the deposit (Test 4
in table above).
Substantial Benefits of Ore Sorting
As already indicated in the Company’s PEA (May 10, 2022), ore s orting technology offers substantial
benefits versus conventional processing. It will reduce operating costs for milling, flotation and tailings
management due to a significant rejection of low -grade material. Sorting is expected to decrease the
hardness of the ore sent to the mill (lower Bond Work Index of the sorter pre-concentrate product compared
to the feed) , and so, non -negligeable energy savings could be foreseen. The commensurate increase in
the head grade of the ore that will report to the flotation circuit has the potential to result in improved
metallurgical recoveries in the flotation circuit and higher concentrate grades.
Further metallurgical and environmental testing, including comminution, flotation and leachability testing,
will be carried out to progress the feasibility study and ongoing permitting.
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Figure 1. Sample Location for Composite Sample Used in Ore Sorting Test
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 Steinert
Steinert is a global provider of intelligent sorting and separation solutions for the recycling and mining
industries. Steinert, has over 125 years of experience, excels at providing customers technologically
advanced sorting solutions via its extensive process and industry knowledge.
Steinert has been a pioneer in the market, consistently pursuing and achieving its goal of supporting
customers by being a global technology leader. Founded in 1889 in Cologne, Germany, Steinert is the only
manufacturer of magnetic separa tors that has further advanced its classic field of activity and established
sensor-based sorting as a new technology in its product development.
For more information, please visit: https://steinertglobal.com/
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 a nd resource target areas within a 60 -
kilometre radius of the Company's Copper Rand Mill.
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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 François Leclerc et al. (Lac Dore/Chibougamau mining camp) and NI 4 3-101 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.
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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 forwa rd-looking statements. Forward -looking statements are
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and other exp loration or other risks detailed herein and from time to time in the filings made by the Company with
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