Doré Copper Announces Positive ORE Sorting Test FOR Corner BAY Mineralized Material
PRESS RELEASE
DORÉ COPPER ANNOUNCES POSITIVE ORE SORTING TEST FOR CORNER BAY
MINERALIZED MATERIAL
Toronto, Ontario – December 16, 2021 – Doré Copper Mining Corp. (the " Corporation" or " Doré
Copper") (TSXV: DCMC; OTCQX: DRCMF; FRA: DCM) is pleased to announce positive results from recent
sample test work aimed at determining the effectiveness of utilizing ore sorting technology to improve the
processed grade and reduc e the mill feed tonnage for its flagship Corner Bay h igh-grade copper -gold
project located approximately 55 kilometers by road from the Corporation’s Copper Rand mill, near
Chibougamau, Québec.
Highlights of Ore Sorting Test
• Sample taken from the development mineralized material stockpiled at surface which was extracted
during the preparation of the 2008 bulk sample
• Results indicate that the grade of the pre-concentrate tested with the ore sorter increased 2.6x,
from 2.66% Cu to 6.84% Cu , with a recovery of 95.5% Cu by utilizing an X-ray transmission
(XRT) sensor at Corem’s test facility in Québec City
• Reject material contained 62.8% of the initial mass and had a copper grade of 0.19%
• In practice, a higher recovery would be expected as fine materials from the mining and crushing
operations would join the ore sorter pre-concentrate
• Corner Bay mineralization is amenable to sortin g and would have the following cost and
environmental benefits:
• Decrease in transportation costs and greenhouse gas emissions (GHGs) due to a reduction
of transported material from mine to mill
• Decrease energy consumption at the mill due to the higher feed grade and hardness decrease
of the feed material (lower Bond Work Index of the sorter pre -concentrate product compared
to the feed)
• Reduce production of fine tailings
• Increase capacity of the mill to treat additional materials
Commenting on the results of our first sorting tests , Ernest Mast, President & CEO, stated, "This initial
sorting test is very positive , indicating that the grade of Corner Bay can be signifi cantly upgraded. The
upcoming PEA will include a trade-off study on the integration of ore sorting technology for Corner Bay and
its potential economic benefits. Based on the historical sorting test work and the nature of the mineralization
at the Devlin deposit , our secondary hub -and-spoke asset, we expect that ore sorting could also be
successful there. Future development work will include additional ore sorting tests in different areas of the
deposits.”
“As the implementation of ore sorting opens up new alternatives for the mill that require additional analysis,
the Company is now planning to have the preliminary economic assessment ( PEA) completed by the end
of the first quarter of 2022. In addition, it will incorporate an updated mineral resource for Corner Bay which
will include positive drill results that now connect the area between the Main Zone (below the dyke) and the
Lower Deep Vein. We expect to have all the assay results in January. This area is expected to add
significant tonnage as it is now considered waste in the current resource.”
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Ore Sorting Tests
Corem was commissioned to undertake test work at their facility in Québec City to establish the amenability
of the Corner Bay mineralized material to ore sorting using an XRT sensor.
A representative bulk sample was prepared by Doré Copper by selecting rocks from the development
mineralized material stockpiled at surface from the project site . The material was selected to represent
different rock types: semi and massive sul phides, shear zone, diorite dyke and anorthosite. At Corem’s
facility, each rock type was crushed to less than 1 ½ inches (38 millimeters or mm) and screened at ¾ inch
(19 mm). The fractions between 1 ½ inches and ¾ inches of each rock type were blended in different
proportion to compose a representative bulk sample prior sorting. An industrial 1 m belt width COMEX
OCXR-1000 integrated X -ray and optical sorting system was used and only the dual energy X -ray
transmission (DE-XRT) sensor was used for the testing.
The ore sorting process helps concentrate the metals of commercial interest, which were principally
associated with high density sulphide minerals. During this process, rocks were individually scanned, and
low grade (low density) waste material is selectively diverted away from downstream processing. As a first
step, the XRT sensor was calibrated with 100 different rocks representing all rock types and a calibration
algorithm was developed for the Corner Bay material . A continuous production run was done on a 95 kg
sample. The testing was done with three passes where the reject material from each pass was re-processed
by the sorter. This methodology allowed to vary a large range of operating conditions and to establish a
grade-recovery curve, useful to evaluate different separation scenarios.
The sum of the three pre-concentrates represented 37.2% of the feed mass at a grade of 6.84 % Cu and
resulted in a cumulative copper recovery of 95.5%. The final reject portion represented 62.8% of the initial
mass at a grade of 0.19% Cu representing 4.5% of the copper fed in the sorter . Fines from the crushing
operation, grading 3.26% Cu, were not included in the ore sorting test. Some fines were generated, but as
the rock types were crushed separately the crushing proportions were not considered for calculations.
Therefore, in an operating application where the fine material fraction would join the pre-concentrate, the
final pre-concentrate grade would be lower and the recovery would be higher than indicated by this test.
Potential Benefits of Ore Sorting
Sorting of the run-of-mine (ROM) material has the potential to reduce operating costs for milling, flotation
and tailings management since it corresponds to a significant rejection of low-grade material. Sorting could
decrease the hardness of the ore sent to the mill , and so, non -negligeable energy savings could be
foreseen. The Bond Work Index (Wi) of the ore sorter pre-concentrate was determined to be 11.0 kWh/t by
Corem. This is 20% less than the historical Wi of 13.7 kWh/t for the Corner Bay ore. The commensurate
increase in the head grade of the ore reporting to the flotation circuit has the potential to also result in
improved metallurgical recoveries in the flotation circuit and higher concentrate grades.
Additionally, it is anticipated that potential savings in capital costs related to the smaller milling and flotation
circuit would partially offset the costs associated with the ore sorter or provide capacity to treat additional
material from other deposits in the region in the Copper Rand mill.
Based on the success of th is first test, an ore sorting trade-off study will be integrated into the Company's
upcoming PEA.
Qualified Persons
Ernest Mast, P.Eng., President and CEO of the Corporation and a "Qualified Person" within the meaning
of National Instrument 43-101, has reviewed and approved the technical information contained in this news
release.
About Corem
Corem is a center of expertise and innovation in mineral processing with the largest concentration of
resources dedicated to research and development in this field in Canada. Corem is a not-profit organization
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that works closely with its members, its clients , and its partners to improve competitiveness and to reduce
environmental impact through the industrialization of innovative solutions. Corem has extensive equipment
and infrastructure, including a pilot plant and laboratories for grinding, physical separation (gravimetric and
magnetic), flotation, extractive metallurgy, hydrometallurgy, pelletizing, thermal treatment processes as well
as mineralogical characterization. For more information, please visit: corem.qc.ca
About Doré Copper Mining Corp.
Doré Copper Mining Corp. aims to be the next copper producer in Québec with a 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 2,700 tonnes per day mill. The Corporation is expected to
deliver a PEA by the end of the first quarter of 20 22 and then initiate a feasibility study and permit
applications.
The Corporation has consolidated a large land package in the prolific Lac Doré/Chibougamau and Joe
Mann mining camps that has produced 1.6 billion pounds of copper and 4.4 million ounces of gold1. The
land package includes 13 former producing mines, deposits and resource target areas within a 60-kilometre
radius of the Corporation’s Copper Rand Mill.
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: emast@Dorécopper.com Email: lgaborit@Dorécopper.com
For more information, please visit: www.dorecopper.com
Facebook: Doré Copper Mining
LinkedIn: Doré Copper Mining Corp.
Twitter: @DoreCopper
Instagram: @DoreCopperMining
1. 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 Doré/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).
Cautionary Note Regarding Forward-Looking Statements
This news release includes c ertain "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 as "seek", "anticipate", "bel ieve", "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 other similar expressions and includes the negatives thereof. Specific forward-looking
statements in this press release include, but are not limited to, higher copper recovery would be expected as fine
materials from the mining and crushing operations would join the ore sorter pre-concentrate; expectations that ore
sorting could also be successful at Devlin; future development work will include additional ore sorting tests in different
areas of the deposits; planning to have the preliminary economic assessment (PEA) completed by the end of the first
quarter of 2022; incorporating an updated mineral resource for Corner Bay; expecting to have all drill results in January;
area between the Main Zone (below the dyke) and the Lower Deep Vein expected to add significant tonnage; potential
to reduce operating and capital costs with ore sorting technology; aiming to be the next copper producer in Québec
with a production target of +50 Mlbs of copper equivalent annually by implementing a hub-and spoke operation model;
initiating a feasibility study and permit applications after the PEA.
All statements other than statements of historical fact included in this release, including, without limitation, statements
regarding the timing and ability of the Corporation to receive necessary regulatory approvals, and the plans, operations
and prospects of the Corporation and it s 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 ca use 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
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to, actual exploration results, changes in project parameters as plans continue to be re fined, 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 Corporation with
securities regulators. Although the Corporation 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 those 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
Corporation disclaims any intention or obligation to up date or revise any forward -looking statements, whether as a
result of new information, future events or otherwise, except as required by law.
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policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this
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