Cordoba Announces Positive Preliminary Feasibility Study Results for the 100%-Owned Alacran Deposit within the San Matias Copper- Gold-Silver Project in Colombia LOM Production of 849 Mlbs Copper, 0.7 Moz Gold, and 4.7 Moz Silver
Cordoba Announces Positive Preliminary
Feasibility Study Results for the 100%-Owned
Alacran Deposit within the San Matias Copper-
Gold-Silver Project in Colombia
LOM Production of 849 Mlbs Copper, 0.7 Moz Gold, and 4.7 Moz Silver
$415M After-Tax NPV8%, 25.4% After-Tax IRR at $3.60/lb Copper
At Current Spot Metals Prices, After-Tax NPV8% Increases to $650.7M and After-Tax IRR to
32.7%
Vancouver, British Columbia--(Newsfile Corp. - January 11, 2022) - Sarah Armstrong-Montoya,
President and Chief Executive Officer of Cordoba Minerals Corp.
(TSXV: CDB) (OTCQB:CDBMF)
otherwise "Cordoba" or the "Company") is pleased to announce positive results from the Preliminary
Feasibility Study ("PFS") for the Alacran Copper-Gold-Silver Deposit, located within Cordoba's 100%-
owned San Matias Project in Colombia (the "Project"). The PFS has been independently prepared by
Nordmin Engineering Ltd. ("Nordmin") of Thunder Bay, Ontario, and all amounts are in United States
dollars, unless otherwise stated. Summary results of the PFS are shown below in Table 1.
Highlights:
Probable Mineral Reserves totalling 102.1 Mt grading 0.41% copper, 0.26 g/t gold, and 2.30 g/t
silver diluted.
22,000 tonnes per day ("tpd") open pit mining operation, with average annual production of 68.8
Mlbs copper, 55 koz gold, and 386 koz silver, over a 13-year Life of Mine ("LOM"). Low overall
strip ratio of 1.1.
During the first 6 years of production, copper, gold and silver grades within the fresh and transition
rock are expected to average 0.61%, 0.29 g/t and 3.50 g/t respectively.
Total recovered production of 849 Mlbs copper, 0.7 Moz gold, and 4.7 Moz silver, with
metallurgical recoveries averaging 92.5% copper, 78.1% gold, and 62.9% silver in copper and
precious metals concentrates. The copper concentrate is expected to contain very low contents of
deleterious elements, such as arsenic and lead.
Copper C1 cash costs averaging $2.59/lb copper (before credits), and $1.18/lb net of precious
metals by-product credits.
Initial capital expenditures total $434.9 million. LOM capital expenditures, including sustaining
capital, reclamation and closure costs total $591.0 million.
After-tax NPV
8
of $415.1 million and IRR of 25.4%, representing a 2.9-year payback using the
same metals price assumptions.
Financial analysis shows that 60%, or $292.1 million of the $434.9 million initial capital expenditure
can be financed by debt.
This would improve the after-tax IRR to 27.2%, but marginally reduce the
NPV
8
to $394.5 million.
At current metals prices of $4.28/lb copper, $1,778/oz gold and $21.93/oz silver, after-tax
NPV
8
increases to $650.7 million and IRR to 32.7%, representing a 2.4-year payback
[1]
.
The Alacran Mine is expected to generate $190.4 million in government royalty revenue plus
$514.2 million in income tax revenue to support government and social programs in Colombia and
local communities.
The current PFS does not include the satellite deposits: Montiel East, Montiel West and Costa
Azul. The combination of infill drilling in the Alacran Deposit and the inclusion of satellite deposits
has the potential to significantly add value to the Project and potentially extend the mine life.
The following is a summary of the material aspects and assumptions of the PFS. Investors are urged to
review the complete NI 43-101 report following its filing on SEDAR for complete details of the PFS.
"Achieving this positive PFS result is an extraordinary accomplishment given the COVID-19 related
challenges over the past two years. Having started the PFS in December 2019, we had to contend with
severe national and international lockdowns, travel disruptions, and the obligation to meet the Mining
Technical Work Plan (Programa de Trabajo y Obras or "PTO") submission deadline which meant a
very limited window to collect PFS data. As a direct result of this, we had to focus on the Alacran
Deposit only, since the PEA had shown us that this is where the bulk of the project value is. With the
approval from the Board of the PFS, Nordmin and the Cordoba team are to be congratulated on
delivering the Study under such challenging conditions.
The PFS confirms that we have a very valuable and deliverable project, with quick payback period
and robust financial returns, that will deliver significant value for all stakeholders. We look forward to
continuing to advance the development of this important project,"
commented Sarah Armstrong-
Montoya, President and CEO of Cordoba.
San Matias Copper-Gold-Silver Project Overview
The San Matias Copper-Gold-Silver Project is located in the municipality of Puerto Libertador,
Department of Có rdoba, Colombia, and is approximately 160 kilometres north of Medellin. The site is
road accessible from the town of Puerto Libertador, approximately 20 kilometres away.
The PFS details a conventional open pit mining operation for Alacran and a processing plant. It also
includes key infrastructure components such as the WMF, external and internal access roads, power
supply and distribution, freshwater supply and distribution, and water treatment plant.
Table 1:
PFS Highlights
Production Metrics
Life of Mine (years)
13
Recovered copper (Mlbs)
848.6
Recovered gold (Moz)
0.68
Recovered silver (Moz)
4.7
Average copper recovery
92.5%
Average gold recovery
78.1%
Average silver recovery
62.9%
Average annual copper production (Mlbs)
68.8
Average annual gold production (koz)
55
Average annual silver production (koz)
386
Total ore mined(tonnes)
102,100,000
Total waste (tonnes)
109,685,000
Total material (tonnes)
211,785,000
Strip ratio (waste:ore)
1.1
Average LOM mine copper grade (%)
0.41
Average LOM mine gold grade (g/t)
0.26
Average LOM mine silver grade (g/t)
2.30
Processing rate (tpd)
22,000
Operating Costs
Total operating cost ($/t milled; incl. royalties)
$
20.97
All-In Sustaining Cost ("AISC") ($/lb copper; net of by-product credits)
$
1.38
Capital Costs ($M)
Initial capital expenditures
$
434.9
Sustaining capital expenditures
$
156.1
Total LOM capital expenditures (incl. WMF, sustaining, closure)
$
591.0
Economic Analysis
Pre-tax unlevered free cash flow ($M)
$
1,387.6
Pre-tax NPV
8
($M)
$
734.9
Pre-tax IRR
36.1%
After-tax unlevered free cash flow ($M)
$
873.4
After-tax NPV
8
($M)
$
415.1
After-tax IRR
25.4%
Copper price ($/lb)
$
3.60
Gold price ($/oz)
$
1,650
Silver price ($/oz)
$
21.00
Open Pit Mining
Open pit mining will include conventional drilling and blasting with a combination of a backhoe type
excavator and front-end loader type excavator loading broken rock into haul trucks, which will haul the
material from the bench to the crusher. The open pit mine plan for the PFS assumed three phases - the
initial pit, the north expansion, and the south expansion. This phased approach brings forward higher
value material where possible - that is, mining at an elevated cut-off grade for the first five years of
production period and stockpiling lower-grade material for later processing. During the 13-year mine life,
copper, gold and silver grades are expected to average 0.41%, 0.26 g/t and 2.30 g/t respectively with a
low strip ratio of 1.1. Figure 1 and Table 2 outline the Alacran Mineral Resource while Figure 2 and
Table 3 collectively outline the Alacran Mineral Reserve. Figure 3 outlines the recovered metal,
processing head grades and overall material movement while Figure 4 outlines the site general
arrangement.
Figure 1:
2022 PFS plan view of the Open Pit and cross section of the Mineral Resource.
To view an enhanced version of this graphic, please visit:
https://orders.newsfilecorp.com/files/3116/109662_a41c6801f40359ad_002full.jpg
Figure 2:
3D view of the ultimate pit shell showing the Mineral Reserve Material by rock type
and grade bin.
To view an enhanced version of this graphic, please visit:
https://orders.newsfilecorp.com/files/3116/109662_a41c6801f40359ad_003full.jpg
Figure 3:
Production Head Grades, Recovered Metal and Material Movement.
To view an enhanced version of this graphic, please visit:
https://orders.newsfilecorp.com/files/3116/109662_a41c6801f40359ad_004full.jpg
Figure 4:
Site conceptual general arrangement showing the Alacran open pit, the mill location
and the WMF.
To view an enhanced version of this graphic, please visit:
https://orders.newsfilecorp.com/files/3116/109662_a41c6801f40359ad_005full.jpg
Table 2:
2021 Mineral Resource Estimate
Classification
Tonnage
(Mt)
NSR
($)
CuEq
Grade
(%)
Copper
Grade
(%)
Gold
Grade
(g/t)
Silver
Grade
(g/t)
Contained
Copper
(tonnes)
Contained
Copper
(Mlb)
Contained
Gold (oz)
Contained
Silver (oz)
Indicated Resources
Alacran
105.6
8.85
n/a
0.44
0.27
2.52
466,719
1,028.9
921,957
8,545,652
Montiel East
4.3
-
0.7
0.46
0.35
1.53
19,800
43.7
48,800
Montiel West
4.6
-
0.52
0.24
0.49
1.32
11,200
24.8
72,600
Costa Azul
7.4
-
0.4
0.24
0.21
0.65
20,300
44.8
49,200
Total Indicated
121.9
-
0.64
0.42
0.28
2.33
518,019
1,142.2
1,092,557
9,108,452
Inferred Resources
Alacran
2.6
8.85
n/a
0.20
0.17
0.86
5,228
11.5
14,531
Montiel East
1.8
-
0.34
0.25
0.15
0.88
4,400
9.6
8,500
Montiel West
0.6
-
0.39
0.07
0.54
0.96
400
1
11,100
Costa Azul
0.1
-
0.39
0.29
0.16
0.6
400
0.8
600
Total Inferred
5.1
-
0.39
0.204
0.206
0.874
10,428
22.9
34,731
Only the Alacran Deposit was updated during the 2021 Mineral Resource Estimate. The Mineral
Resource Estimates for the three satellite deposits: Montiel East, Montiel West, and Costa Azul have not
been updated. The work on the Mineral Resource Estimate for the PFS included a detailed geological
re-examination of the structural controls to high-grade Au veins within the Alacran Deposit.
Notes on Mineral Resources
1
.
The Mineral Resources in this estimate were independently prepared by Glen Kuntz, P.Geo. of
Nordmin Engineering Ltd and the Mineral Resources were prepared in accordance with NI 43-101
and the CIM Definition Standards for Mineral Resources and Mineral Reserves (2014) and the CIM
Estimation of Mineral Resources and Mineral Reserves Best Practice Guidelines (2019). Mineral
Resources that are not Mineral Reserves do not have demonstrated economic viability. This
estimate of Mineral Resources may be materially affected by environmental, permitting, legal, title,
taxation, sociopolitical, marketing, or other relevant issues.
2
.
Verification included multiple site visits to inspect drilling, logging, density measurement
procedures and sampling procedures, and a review of the control sample results used to assess
laboratory assay quality. In addition, a random selection of the drill hole database results was
compared with original records.
3
.
The Mineral Resources in this estimate for the Alacran Deposit used Datamine Studio RMTM
Software to create the block models and Geovia's SurpacTM and WhittleTM software to constrain
the resources and create conceptual open pit shell for the deposit. Assumptions used to prepare
the conceptual pit for Alacran deposit include:
Metal prices of $3.25/lb copper, $1,600.00/oz gold, and $20.00/oz silver;
Operating cost inputs include:
a
.
Mining cost of $1.73/t for Saprolite, and $2.30/t for transition and fresh rock for the
overall life of mine
b
.
Processing costs of $1.78/t for Saprolite, and $8.85/tonne Fresh and Transition rock.
This includes assumption for Milling, G&A, and Tailings
98.0% mining recovery, 2.0% dilution and 41°-48° pit slope in fresh and transitional rock, and
36.5° in weathered saprolite
Freight costs of $30.00t concentrate from Mine to Port and $82.00t concentrate Port to
Smelter
Treatment costs of $85.00/t dry concentrate, payable metal factors of 95.0% for copper,
96.5% for gold, and 90.0% for silver
Refining charges of $0.085/lb copper, $5.00/oz gold, and $0.30/oz silver
(i)
An NSR cut-off of $1.78/t for saprolite and $8.85/t for transition and fresh rock has been applied to
Alacran. The NSR value was calculated using preliminary production and processing parameters and
commodity metal prices as follows:
NSR_Cu = Cu_% * MiningRec_% * MillCuRec_% * 51.53/% Cu (On Site Value)
NSR_Au = Au_g/t * MiningRec_% * MillAuRec_% * 46.55_$/g (On Site Value)
NSR_Ag = Ag_g/t * MiningRec_% * MillAgRec_% * 0.54_$/g (On Site Value)
NSR = NSR_Cu + NSR_Au + NSR_Ag
The Mineral Resource effective date is August 3, 2021.
4
.
The Mineral Resources in this estimate for the satellite deposits used Datamine Studio 3™
software to create the block models and Datamine NPV Scheduler™ to constrain resources and
create conceptual open pit shells using Indicated and Inferred mineralized material (oxide and
sulphide). Assumptions used to prepare the conceptual pits for the satellite deposits include:
Metal prices of $3.10/lb copper, $1,400/oz gold, and $17.75/oz silver;
An NSR cut-off of $13.75/tonne has been applied. This equates to approximately 0.22%
CuEq as calculated in the block model.
Operating cost inputs include:
Mining cost of $2.43/t mined for the first 5 years and $1.69/t thereafter,
Processing cost of $8.63/t milled for the first 5 years and $7.50/t thereafter,
G&A costs of $2.56/t milled for the first 5 years and $1.32/t thereafter,
97.0% mining recovery, 4.0% dilution, and 45° pit slope in fresh and transitional rock and
32.5°in weathered saprolite,
Variable process recoveries of 50.0% to 90.0% for copper, 72.0% to 77.5% for gold, and
40.0% to 70.0% for silver depending on the domain (saprolite, transition, or fresh sulphide)
and copper grade.
Freight costs of $100.00/t concentrate, and treatment costs of $90.00/t dry concentrate,
payable metal factors of 95.5% for copper and 96.5% for gold and 90.0% for silver. Refining
charges of $0.090/lb copper, $5.00/oz gold and $0.30/oz silver.
Copper equivalency has been used for the three satellite pits and was calculated using:
CuEq % = Cu % + (Au Factor x Au Grade g/t + Ag Factor x Ag Grade g/t) x 100.
Au Factor = (Au Recovery % x Au Price $/oz / 31.1035 g/oz) / (Cu Recovery % x Cu
Price $/lb x 2204.62 lb/t).
Ag Factor = (Ag Recovery % x Ag Price $/oz / 31.1035 g/oz) / (Cu Recovery % x Cu
Price $/lb x 2204.62 lb/t).
Variable process recoveries of 50.0% to 90.0% for copper, 72.0% to 77.5% for gold
and 40.0% to 70.0% for silver depending on the domain (saprolite, transition, or fresh
sulphide) and copper grade.
The Mineral Resource of the satellite deposits effective date is July 24, 2019.
5
.
The 2019 Mineral Resource Estimate for the Alacran Deposit is no longer considered to be current
and is not to be relied upon for the Alacran Mineral Resource Estimate. Changes have not been
made to the Mineral Resource Estimates for the satellite deposits (Montiel East, Montiel West, and
Costa Azul). For further information with respect to the Mineral Resource estimate for the satellite
deposits, please see NI 43-101 technical report titled "NI 43-101 Technical Report and Preliminary
Economic Assessment, San Matías Copper-Gold-Silver Project, Colombia" with an effective date
of July 29, 2019 available under the Company's SEDAR profile at
www.sedar.com
.
6
.
Totals may not sum due to rounding.
Table 3:
Mineral Reserve Estimate
Category
NSR Value
Cut-off
Grade
Tonnage (t)
Diluted Cu
Grade (%)
Diluted Au
Grade (g/t)
Diluted
Ag
Grade (g/t)
Probable Mineral
Reserve
Saprolite
1.78 $/t
10,135,000
0.21
Probable Mineral
Reserve
Transition
8.85 $/t
2,011,000
0.62
0.22
3.11
Probable Mineral
Reserve
Fresh
8.85 $/t
89,954,000
0.45
0.27
2.54
Probable Mineral
Reserve
Fresh +
Transition
8.85 $/t
91,165,000
0.45
0.27
2.56
Probable Mineral
Reserve
Overall Total
102,100,000
0.41
0.26
2.30
The Mineral Reserve estimate for the Alacran Deposit is based on the resource block model estimated
by Nordmin. The block model contained both Indicated and Inferred Mineral Resources (see below),
however only Indicated Mineral Resources were used. Inferred Mineral Resources in the block model
were not included in the Probable Mineral Reserve and remain classified as waste; Inferred Mineral
Resources do not meet the standards required for inclusion in Mineral Reserves.
Mineral Reserves for the Alacran Deposit incorporate appropriate mining dilution and mining recovery
estimations for the open pit mining method. The reference point at which Mineral Reserves are defined,
is the point where the ore is delivered to the processing facility, including ROM stockpiles.
Notes on Mineral Reserve:
The independent and Qualified Person for the Mineral Reserve Estimate, as defined by NI 43-101,
is Joanne Robinson, P.Eng. of Nordmin Engineering Ltd.
The effective date of the Mineral Reserves estimate is October, 31, 2021.
The Mineral Reserve Estimate is based metallurgical recovery algorithms, that result in an overall
recovery of 92.5% of Cu in the Fresh and Transition material, 78.1% Au in Fresh, Transition and
Saprolite, and 62.9% Ag in the Fresh and Transition material
Mineral Reserves are inclusive of Mineral Resources at Alacran.
Copper and Silver are not planned to be recovered from Saprolite material.
Metal prices are set at 3.25 $/lb Cu, 1,600 $/oz Au, 20 $/oz Ag
The Mineral Reserve Estimate incorporates mining dilution and mining loss assumptions through
regularization of block size and a mining recovery factor of 98%.
Mineral Processing
The process plant has been designed as a conventional milling operation of 22,000 tpd for the 13-year
mine life. Run of mine feed from the adjacent open pit will be hauled to a primary crusher facility
consisting of a gyratory crusher, before being conveyed to a 25,000-tonne surface stockpile prior to the
mill facility. On average, 20,000 tpd of fresh/transition ore will be blended with 2,000 tpd of saprolite prior
to the primary crusher by mine operations on a day to day basis.
A conventional SABC comminution circuit followed by a standard copper/gold sulphide flotation circuit
complete with a regrind stage was proven to produce good quality copper and gold concentrates. The
comminution circuit consists of a SAG mill with a pebble crusher, and a ball mill operating in a closed
circuit with a hydrocyclone cluster. Cyclone overflow of P
80
of 200 µm will report to a four-stage flotation
circuit including a roughing stage, primary, secondary and tertiary cleaning. Two stages of gravity
concentration will be utilized to produce a dedicated gold and silver rich concentrate. The concentrate
can be handled and stored separately from the primary beneficiation product if it is advantageous to
market as such.
Relevant PFS level metallurgical testwork was performed by Blue Coast Research on a master
composite that was composed of mineralisation classified into three categories, namely fresh ore,
transition ore, and saprolite. Advancement of the metallurgical performance based on this master
composite, that better represents the mining approach over life of mine, is a significant improvement
over previous work. As such, the representativity and suitability of the derived testwork data has resulted
in the development of an efficient and conventional comminution and flotation circuit for the processing
plant.
Overall metallurgical recoveries are expected to average 92.5% for copper in the Fresh and Transition
material, 78.1% for gold in the Fresh, Transition, and Saprolite material, and 62.9% for silver in the Fresh
and Transition material.
Power, Water Management and Transport
Electrical power is expected to be supplied via a new 35 km long, 110 kilovolt ("kV") power line
connecting to the Cerro Matoso substation which is owned and operated by Interconexión Eléctrica
("ISA"). Project peak power demand is approximately 41 megawatts ("MW"), taking into consideration