Doré Copper Reports High-Grade GOLD Mineralization at Gwillim Including 9.67 G/T Au over 5.3 Metres
PRESS RELEASE
DORÉ COPPER REPORTS HIGH-GRADE GOLD MINERALIZATION AT GWILLIM
INCLUDING 9.67 G/T AU OVER 5.3 METRES
Toronto, Ontario – May 29, 2023 – Doré Copper Mining Corp. (the " Corporation" or " Doré Copper")
(TSXV: DCMC; OTCQX: DRCMF; FRA: DCM) announces positive assay results from the first of two drill
holes completed in late 2022 on the KOD zone of the Gwillim property, which is under a 50/50 joint venture
with Argonaut Gold Inc. (through its wholly owned subsidiary Prodigy Gold Inc.). Doré Copper is the
operator of the joint venture. Gwillim is located approximately 8 kilometers by road northwest of
Chibougamau, Québec.
Drilling Highlights
KOD-22-04
• Zone B: 9.67 g/t Au over 5.3 meters (visible gold)
• Zone C: 11.10 g/t Au over 3.0 meters
In addition to the drilling program , the joint venture completed a 146 line-kilometer VTEMTM airborne
electromagnetic survey over the property and a televiewer acoustic and optical survey in seven drill holes
of the KOD zone. The VTEM™ survey results have identified several conductive anomalies. Specifically,
one large anomaly is located at the KOD zone starting at a depth of 150 meters, just west of holes KOD -
22-04 and 05.
Ernest Mast, President and CEO of Doré Copper, commented, “The limited drilling to date on the KOD zone
is demonstrating good continuity of the high-grade gold mineralization from surface to a vertical depth of
approximately 600 meters and the system remains open at depth . Further work is warranted to test the
strike and depth extension of the KOD zone, along with a number of conductive anomalies.”
Gwillim Drilling Program
Doré Copper drilled two holes totaling 1,320 meters in December 2022 to follow up on positive results from
two holes completed the prior year on the KOD zone (Table 1), located 300 meters south of the mined
Gwillim Main zone (refer to news release April 21, 2022). Hole KOD-22-04 intersected two main mineralized
zones, of 9.67 g/t Au over 5.3 meters, including 19.46 g/t Au over 2.1 meters, starting at a vertical depth
of approximately 580 meters and 11.10 g/t Au over 3.0 meters, which are interpreted as zones B and C
of the KOD mineralized structure (Figures 1 and 2, and Table 1). These gold intercepts in zones B and C
are located approximately 1 90 and 215 meters, respectively, below hole KOD -21-03. In addition, a wide
zone of low-grade mineralization, 0.86 g/t Au over 42.3 meters, was intersected from 460 to 502.3 meters.
Assays are pending from 130 to 323.5 meters.
The KOD mineralized system remains open along strike and below 600 meters. Assays are pending for
hole KOD-22-05, drilled on the same pad as KOD-22-04 and approximately 60 meters west-southwest of
zone B intersected in KOD-22-04.
Gold mineralization in the KOD zone i s found mainly in millimetric to centimetric quartz veins intersecting
the massive basalt unit close to the contact with gabbroic or quartz-feldspar (“QFP”) dykes, which range
from 30 centimeters to 10 meters. In some places, these veins can take the expression of silica flooding in
basaltic pillow rims, associated with pyrite, pyrrhotite and chalcopyrite . Visible gold is occasionally
observed.
A televiewer acoustic and optical survey was conducted in seven holes (87-KOD-20, 87-KOD-21, KOD-18-
01, KOD-21-02, KOD-21-03, KOD-22-04 and KOD-22-05) to gain a better understanding of the orientation
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of the mineralized zones and the QFP dykes . The analysis and survey results will be available once the
assays have been received for KOD-22-05.
In January 2023, Doré Copper and its joint venture partner contracted the services of Geotech to carry out
a 146 line-kilometre airborne VTEM™ survey over the joint venture property. The flight lines were flown at
a 75 meter spacing . The objective of the geophysical survey is to outline any conductors that could
represent masses of sulphides. A number of a nomalies have been identified in this survey and are
expected to be followed up in the field starting in the summer of 2023. A significant, large anomaly is located
on the KOD zone starting at a depth of 150 meters, just west of holes KOD-22-04 and 05 (shown on Figure
2).
Gwillim Property
The Gwillim property totals 486 ha. The western part of the property (385 ha) is under a 50/50 joint venture
between Dore Copper and Argonaut Gold Inc. (through its wholly owned subsidiary Prodigy Gold Inc.) with
Dore Copper being the operator. The eastern part of the property (102 ha) is 100% owned by Dore Copper.
Located on the joint venture land, the Gwillim mine operated between 1974 and 1976 and again from 1980
to 1984. In total 254,066 short tons were mined at a grade of 4. 79 g/t Au1. Most of the production came
from the Main zone, which extended along strike for 122 m eters with an average width of 2.6 m eters and
up to a depth of 114 metres.
In 1987, two high -grade intercepts of 7 .6 meters at 38.0 g/t Au and 7.9 meters at 17.9 g/t Au were drilled
by Greenstone Resources Ltd. at moderate depths of 200 to 300 meters at the KOD zone (300 meters
south of the mined Gwillim Main zone)2. A further 25 holes were drilled from the surface before a ramp was
developed and the zone was further explored from underground in 1988 but not mined (some development
through ore). In 1989, three more surface holes were drilled to depths of 400 meters with one hole
confirming the extension of the high -grade mineralization beyond 300 m eters vertical depth. An internal
report from 1989 outlined a small historical resource (not NI 43-101 compliant) for the KOD zone. No other
significant exploration activities are reported after this work . The historical information is being compiled
and Figure 2 highlights a portion of the results from the historical drilling on the KOD zone.
Gwillim is hosted within the Roy group in the Bruneau Formation, in pillowed basalts and gabbroic sill.
Mineralization is hosted predominantly within east -west, steeply dipping structures containing quartz -
carbonate veins with limited amounts of massive sulphides. At KOD, there are two parallel east -west vein
zones, approximately 50 meters apart, with the mineralization predominantly occurring in the northernmost
vein. The thickness of the mineralization varies between 0.3 and 5.0 meters. The KOD zone is open along
strike and at depth.
References:
1 Structural and Stratigraphic Control on Magmatic, Volcanogenic, and Shear Zone-Hosted Mineralization in the
Chapais-Chibougamau Mining Camp, Northeastern Abitibi, Canada – Leclerc et al., 1992 Society of economic geologist
inc. V 107, pp. 963-989.
2 Diamond Drilling Report on the Gwillim Lake KOD Zone, Greenstone Resources (internal report) – Robert McIntosh,
Project Geologist, Flanagan McAdam and Company, December 1989.
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 (half core) preparation was done at ALS Canada Ltd. (“ALS”) in Val-d’Or, Québec, and the fire
assay and ICP analysis was done at ALS in Vancouver, B.C. Samples were weighed, dried, crushed to
75% passing 2 mm, split to 250 g, and pulverized to 85% passing 75 microns. Samples are fire assayed
for gold (Au) (50 g) and sodium peroxide fusion ICP -MS finish for 34 elements. Samples assaying >10.0
g/t Au are re-analyzed with a gravimetric finish using a 50 g charge. If visible gold is observed in the sample,
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the assay is performed by metallic screening whereby the entire sample is crushed, a 1 kg portion is
pulverized and screened to 106 µm and analyzed by 50 g fire assay with gravimetric finish.
QA/QC is done in house by Doré Copper geologists with oversight from the Vice President Exploration.
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 samp le 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 la rge
discrepancies in the check samples, then the entire batch is requested to be re -assayed.
Sylvain Lépine, M.Sc, P.Geo, MBA, Vice President Exploration of the Corporation and a "Qualified Person"
within the meaning of National Instrument 43 -101, has rev iewed and approved the technical information
contained in this news release.
Table 1. Gwillim Assays Highlights from the 2022 and 2021 Drill Program
Hole From
(m)
To
(m)
Width1
(m)
Au
(g/t) Zone
KOD-22-04 460.0 502.3 42.3 0.86 unnamed
including 487.6 491.0 3.4 3.10 “
521.0 522.0 1.0 7.11 unnamed
566.0 567.0 1.0 7.30 unnamed
591.5 596.8 5.3 9.67 KOD Zone B, VG
including 591.5 593.6 2.1 19.46 “
611.5 614.5 3.0 11.10 KOD Zone C
including 612.0 612.5 0.5 47.8 “
including 613.0 613.5 0.5 4.08 “
including 614.0 614.5 0.5 13.30 “
2021 Drilling Program (April 21, 2022 news release)
KOD-21-02 28.7 42.0 13.3 3.33 unnamed
including 28.7 29.2 0.5 23.2 unnamed
including 41.0 42.0 1.0 26.8 unnamed
138.5 141.5 3.0 3.39 unnamed
203.5 207.5 4.0 10.14 KOD Zone C
KOD-21-03 395.0 399.0 4.0 3.03 unnamed
448.5 454.5 6.0 4.64 KOD Zone C
including 448.5 450.5 2.0 11.69 KOD Zone B
1. The true width of the structures intersected is estimated at approximately 55-60% of the downhole width.
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Figure 1. Surface plan of a portion of the Gwillim Property showing the location of the 2022 drill
holes.
Figure 2. Long-section of the KOD Zone B and C.
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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 million pounds of copper equivalent annually by implementing a hub-and spoke operation model
with multiple high-grade copper-gold assets feeding its centralized Copper Rand mill1. The Corporation has
delivered its PEA in May 2022 and is proceeding with a feasibility study.
The Corporation 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-kilometer 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: [email protected] Email: [email protected]
Visit: www.dorecopper.com
Facebook: Doré Copper Mining Twitter: @DoreCopper
LinkedIn: Doré Copper Mining Corp. 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 (“NI 43-101”).
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 fi gures: 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/C hibougamau 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
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statements in this press release include, but are not limited to aiming to be the next copper producer in Québec with
an initial production target of +50 Mlbs of copper equivalent annually, implementing a hub-and spoke operation model;
and completing a feasibility study.
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