Doré Copper Intersects 5.5 Meters at 3.46% Copper and 0.25 G/T GOLD at Corner BAY – Extending Deposit Along Strike BY 200 Metres
PRESS RELEASE
DORÉ COPPER INTERSECTS 5.5 METERS AT 3.46% COPPER AND 0.25 G/T
GOLD AT CORNER BAY – EXTENDING DEPOSIT ALONG STRIKE BY 200 METRES
Toronto, Ontario – May 17, 2021 – Doré Copper Mining Corp. (the " Corporation" or " Doré Copper")
(TSXV: DCMC; OTCQX: DRCMF; FRA: DCM) is pleased to announce the first results from its 2021 drilling
campaign totaling 16,500 meters at its flagship Corner Bay property, located in the Chibougamau mining
camp, approximately 40 kilometers by road from Chibougamau, Québec. As of April 30, 2021, Doré Copper
has completed 17 holes totaling 13,250 meters and is reporting today the results from 11 holes.
Drilling Highlights
Main Vein below dyke
• CB-21-28: 3.7 meters of 5.05% Cu, 0.15 g/t Au and 11.3 g/t Ag, including 1.8 meters of 9.12% Cu,
0.17 g/t Au and 19.2 g/t Ag
• CB-21-29: 3.7 meters of 2.47% Cu, 0.87 g/t Au and 9.3 g/t Ag, including 1.5 meters of 5.25% Cu,
2.05 g/t Au and 12.7 g/t Ag
• CB-21-32: 5.5 meters of 3.46% Cu, 0.25 g/t Au and 8.4 g/t Ag, including 3.6 meters of 4.63% Cu,
0.30 g/t Au, and 11.4 g/t Ag – DEPOSIT EXTENDED BY 200 METERS
West Vein
• CB-20-20 (completed in 2021): 4.0 meters of 2.31% Cu, 0.11 g/t Au, and 7.0 g/t Ag
• CB-21-22: 3.2 meters of 2.84% Cu, 0.32 g/t Au, and 6.25 g/t Ag
Ernest Mast, President and CEO of Doré Copper stated, “We have successfully expanded the size of the
high-grade copper-gold Corner Bay deposit with both our 2020 and 2021 drilling program s and are now
confident in the potential to reach our key target of 5 million tonnes in resources, which would be an increase
of approximately 65% from our 2019 NI 43-101 mineral resource estimate. The furthest southern intercept
(hole CB-21-32) is indicating additional growth towards the south along strike and extends the deposit past
the previously understood plunging mineralization. We have expanded our drilling program to the south
(along strike) to continue delineating the mineralization. We are planning to have an updated mineral
resource estimate in early Q3 to support an eventual hub-and-spoke restart of the camp using our existing
2,700 tpd mil , with Corner Bay as the main feed to the mill . In addition, t he increased strike length and
thicknesses at depth at Corner Bay lend itself to increased mining rates over time.”
Corner Bay Drilling Program
Results to date from t he 2021 drill ing program has successfully continued to expand the copper-gold
mineralization at Corner Bay , bringing the total strike of the m ineralization to over 900 met ers. The
intercepts of holes CB-21-28, CB-21-29, and CB -21-32 have extended the Main Vein (below the diorite
dyke) along strike to the south by approximately 200 meters from the 2020 drilling program (see Figure 1
and Table 1). The high-grade copper intercept of 5.5 meters of 3.46% Cu (including 3.6 meters of 4.63%
Cu) in CB-21-32 (southernmost hole for this part of the deposit ) is located 380 meters south along strike
from the 2019 mineral resource limit. The intercept in hole CB-21-32 also demonstrated that the “La Chib”
fault, which limited the upper part of the deposit, does not limit the mineralization in the deeper part of the
deposit and therefore opens up this part of the deposit along strike.
2
The drilling program also tested the extension of the West Vein (located 400 meters west of the Main Vein)
with four shallow holes. Note that two deeper holes testing the deeper part of the deposit did intersect the
West Vein on the way down as well. The best intercepts included 4.0 meters of 2.31% Cu, 0.11 g/t Au, and
7.0 g/t Ag (hole CB-20-20) and 3.2 meters of 2.84% Cu, 0.32 g/t Au, and 6.25 g/t Ag (hole CB-21-22). The
mineralization is approximately 200 meters from surface and extends for approximately 150 meters
vertically and 200 meters along strike. Historic intercepts had defined a potential resource and the current
drilling program is confirming the historic information.
With these positive results, Doré Copper has expanded the drilling program to approximately 16,500 meters
to test the mineralization further along strike and up-dip from hole CB-21-32 and to test the extension of the
West Vein and East Vein (subparallel to the Main Vein).
In the Main Vein above the dyke, Doré Copper completed five holes to infill the deposit as part of the
upcoming mineral resource estimate. An increase in mineral resources is expected based on the
mineralization intersected in the holes; assay results are pending. Another five drill holes were compl eted
to test the potential northern extension of the Main Vein below the dyke and Deep Main Vein Lens. No
significant mineralization was intersected.
Figure 1. Long section view of the Corner Bay Main Vein below the dyke (blue horizontal line indicates
vertical depth of 880 meters).
3
Figure 2. Isometric view of the entire Corner Bay deposit. The red zones are the mineral resources defined
in the 2019 NI 43-101 Technical Report. The diorite dyke bisects the deposit – Main Vein above the dyke
and Main Vein below the dyke.
Figure 3. Geology map of the Corner Bay deposit with projections to surface of the mineral resources
defined in the 2019 NI 43-101 Technical Report and showing location of hole CB-21-32.
4
Table 1. Corner Bay Property Drill Assay Highlights from the 2021 Drill Program
Hole From
(m)
To
(m)
Width1
(m)
Cu
(%)
Au
(g/t)
Ag
(g/t)
Zone
CB-20-202 257.0 261.0 4.0 2.31 0.11 7.0 West Vein
1,055.5 1,057.8 2.3 0.87 0.12 1.9 Deep Main Vein Lens (north)
CB-21-21 106.2 110.1 3.9 1.35 0.10 4.4 West Vein
CB-21-22 313.0 316.2 3.2 2.84 0.32 6.3 West Vein
CB-21-23 120.6 123.3 2.7 1.67 0.15 3.8 West Vein
CB-21-24 No significant mineralization West Vein
CB-21-25 634.4 640.4 6.0 1.75 0.09 5.4 New lens
including 636.2 640.4 4.2 2.13 0.11 6.7 New lens
766.65 767.5 0.85 0.48 0.04 4.7 Main Vein below dyke (north)
CB-21-26 214.5 228.05 13.55 2.06 0.33 9.3 West Vein
including 219.45 227.0 7.55 3.22 0.56 13.7 West Vein
CB-21-27 No significant mineralization Main Vein below dyke (north)
CB-21-28 1,146.7 1,150.4 3.7 5.05 0.15 11.3 Main Vein below dyke (south)
including 1,147.2 1,149.0 1.8 9.12 0.17 19.2 “
CB-21-29 1,050.6 1,054.3 3.7 2.47 0.87 9.3 Main Vein below dyke (south)
including 1,051.6 1,053.1 1.5 5.25 2.05 12.7 “
CB-21-30 Assays pending Main Vein below dyke (south)
CB-21-31 Assays pending Main Vein above dyke
CB-21-32 1,119.5 1,125.0 5.5 3.46 0.25 8.4 Main Vein below dyke (south)
including 1,120.4 1,124.0 3.6 4.63 0.30 11.4 “
CB-21-33 Assays pending Main Vein above dyke
CB-21-34 Assays pending Main Vein below dyke (south)
CB-21-35 Assays pending Main Vein above dyke
CB-21-36 Assays pending Main Vein above dyke
CB-21-37 Assays pending Main Vein above dyke
1. The true width of the structures intersected is estimated at approximately 60% of the downhole width, except for holes CB-20-20,
CB-20-21 to CB-21-24 where the orientation of the vein in the West Vein is yet to be properly determined. It is interpreted that the
intercept in hole CB-21-26 is sub-parallel to the dip and therefore the true width is estimated at <30%.
2. Hole CB-20-20 was completed in 2021.
Table 2. 2020 Drill Assay Highlights from Main Vein below dyke (south)
Hole From
(m)
To
(m)
Width1
(m)
Cu
(%)
Au
(g/t)
Ag
(g/t)
CB-20-16 1,187.95 1,195.2 7.25 2.46 0.59 5.0
CB-20-16W1 1,155.0 1,158.3 3.3 1.94 0.13 4.5
CB-20-17 974.0 981.0 7.0 9.08 0.41 30.6
including 976.0 980.75 4.75 11.07 0.48 36.1
CB-20-18 1,021.9 1,028.2 6.30 3.03 0.11 6.6
CB-20-19 1,160.75 1,167.2 6.45 4.06 0.38 13.2
including 1,164.85 1,167.2 2.35 6.10 0.74 15.3
1. True widths estimated to be 60-65% of downhole lengths.
5
Corner Bay Deposit
The Corner Bay deposit contains an Indicated resource of 1.35 Mt at an average grade of 3.01% Cu and
0.29 g/t Au, containing 89.8 million pounds of copper and 13,000 ounces of gold, and an Inferred resource
of 1.66 Mt at an average grade of 3.84% Cu and 0.27 g/t Au, containing 140.3 million pounds of copper
and 15,000 ounces of gold, assuming a cut-off grade of 1.5% Cu and a copper price of US$3.25 per pound
(Technical Report dated June 2019).
The Corner Bay deposit is hosted by the intrusive Lac Doré Complex on the southern flank of the
Chibougamau anticline. A regional north -northeastern diorite dyke also cuts the area. Several significant
shear zones oriented north -south and northwest -southeast have been identified in the area. The Corner
Bay area is characterized by copper porphyry style mineralization and by copper mineralization in shear
zones commonly associated with dykes related to the Chibougamau Pluton.
The Main Vein is oriented N10ºW dipping 75 to 85 degrees towards the west. To the north, the Main Vein
is limited by one of the NW-SE structures while to the south it is open at depth across the “La Chib” fault.
The mineralization varies from 15 c entimeters to 8 meters thick, with an average thickness of 2.2 m eters,
located within a shear zone varying in width from 2 to 25 meters. The Main Vein below the dyke to the south
is thicker and higher grade that the Main Vein above the dyke. The Main Vein lateral extension is now more
than 900 meters and it remains open at depth down-dip and along strike.
Drilling and Quality Control
The Company is using Miiken Drilling as the drilling contractor. Miiken 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 preparation and assays were done at SGS lab in Val-d’Or, Québec. Samples were weighed, dried,
crushed to 75% passing 2 mm, split 250 g, pulverized to 85% passing 75 microns. Samples were then fire
assayed for Au (50 g) and sodium peroxide fusion ICP-MS finish for 34 elements.
QA/QC is done in house by Doré Copper Geologists with oversight from the Exploration Manager . The
check samples (blanks and standards – 4% of total samples with another 2% of core duplicates) 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.
Andrey Rinta, P.Geo., the Exploration Manager 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 Doré Copper Mining Corp.
Doré Copper Mining Corp. is a copper -gold explorer and developer in the Chibougamau area of Québec,
Canada. The Corporation is focussed on implementing its hub -and-spoke development strategy by
advancing its key high -grade copper-gold brownfield projects towar ds a restart of operations. Our goal is
to achieve an annual production of 60 million pounds of copper equivalent (or 100,000 ounces gold
equivalent).
The Corporation has consolidated a large land package in the prolific Lac Dore/Chibougamau and Joe
Mann mining camps that has produced 1.6 billion pounds of copper and 4.4 million ounces of gold. The
land package includes 13 former producing mines, deposits and resource target areas within a 60-kilometre
radius of the Company’s 2,700 tpd mill (Copper Rand Mill).
Doré Copper plans to deliver a preliminary economic assessment (PEA) of its hub-and-spoke model in late
2021. Currently, the Corporation is completing a 16,500-metre drilling program at its Corner Bay (Cu-Au)
project which will lead to an updated mineral resource estimate in early Q3 2021. In addition, Doré Copper
6
is expected to have a maiden mineral resource estimate for the former producing Joe Mann mine (Au-Cu)
by end of June 2021.
For further information, please visit the Corporation's website at www.dorecopper.com or refer to Doré
Copper's SEDAR filings at www.sedar.com or 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]
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 as "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 other similar expressions and includes the negatives thereof. 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 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 futu re 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 to 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 explorat ion 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 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) accep ts responsibility for the adequacy or accuracy of this
news release.