Cobre del Mayo operates the Piedras Verdes copper mine in Mexico which began production in 2006. It produces copper cathode and sells ore for processing. Since being acquired in 2009, management has implemented initiatives to stabilize operations, including converting to owner operation and installing crushing and conveying systems. Safety, environmental, and community relations are key focuses. The mine has over 17 years of remaining mine life based on increased mineral resource estimates to over 685 million tons through exploration programs.

1. 1
COBRE DEL MAYO
Investor Presentation
June 2014
All amounts in USD million ($M) unless otherwise noted

2. 2
Disclaimer and Forward Looking Statements
COBRE DEL MAYO 2
The information contained herein has been prepared to assist interested parties in making their own evaluation of the Piedras Verdes Project and does not purport
to be all inclusive or to contain all of the information that a prospective purchaser may desire.
Forward Looking Statements
This Investor Presentation and other communication with investors include forward-looking statements. These forward- looking statements include, without
limitation, statements regarding our future financial position and results of operations, our strategy, plans, objectives, goals and targets, future developments in the
markets in which we participate or are seeking to participate or anticipated regulatory changes in the markets in which we operate or intend to operate. In some
cases, forward-looking statements can be identified by terminology such as “aim,” “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “forecast,”
“guidance,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “should” or “will” or the negative of such terms or other comparable terminology.
By their nature, forward-looking statements involve risks and uncertainties because they relate to events and depend on circumstances that may or may not occur
in the future. We caution potential investors that forward-looking statements are not guarantees of future performance and are based on numerous assumptions
and that our actual results of operations, financial condition and liquidity may differ materially from (and be more negative than) those made in, or suggested by, the
forward-looking statements contained in the Offering Memorandum for the Cobre del Mayo notes. In addition, even if our results of operations, financial condition
and liquidity and the development of the industry in which we operate, are consistent with the forward-looking statements contained in this Management Discussion
and Analysis Report, those results or developments may not be indicative of results or developments in subsequent periods. Important factors that could cause
these differences include, but are not limited to:
We undertake no obligation to update or revise any forward-looking statement, whether as a result of new information or future events or developments.
• risks related to our competitive position;
• risks related to our strategy and expectations about growth in demand for
copper and business operations, financial condition and results of
operations;
• risks related to the revocation, expropriation or termination of our mining
concessions or our water concessions or of the agreements pursuant to
which we explore or exploit mining concessions belonging to third parties;
• the inability to be compensated fairly in the event of termination of our
mining concessions or our water concessions;
• the impact of fluctuations in the market price for copper;
• the impact of changes in the prices of raw materials, labor and our products;
• our relationship with unions and our ability to negotiate collective bargaining
agreements;
• the availability of materials and equipment;
• our access to funding sources, and the cost of the funding;
• changes in regulatory, administrative or economic conditions affecting the
mining industry, including government interpretations and policies;
• the application and enforcement of environmental laws and regulations;
• risks related to Mexico’s social, political or economic environment;
• the impact of changes in the end uses of our products;
• fluctuations in the value of the U.S. dollar against the Mexican peso;
• risks associated with market demand for and liquidity of the notes; and
• changes in the taxation of our business.

3. 3
Index
I. Company Overview
II. Operational Environment
III. Industry and Commodity Overview
IV. Historical Financial Performance
V. Conclusion
VI. Annexes
4
16
19
24
27
29
COBRE DEL MAYO 3

4. I. Company Overview

5. 5
Cobre del Mayo Snapshot
§ Cobre del Mayo is a Mexican mining company that operates the Piedras Verdes (PV) open-pit copper mine in
Sonora, Mexico
§ Began commercial production in 2006 and operations stopped during 4Q08 due to low copper prices
§ Purchased by Invecture in mid 2009
§ Produces LME Grade A copper cathode and sells refractory and vein type ore for processing into concentrate
§ Third largest copper mine in Mexico as measured by production
§ Mineral resources of 1.7 M tons with estimated remaining mine life of 17+ years
COBRE DEL MAYO 5
13
Piedras Verdes Advantaged Location and Access:
Huatabampo
Chihuahua
Sinaloa
Piedras
Verdes Alamos
Navojoa
Sonora
Ciudad
Obregon
Guaymas
Baja
California
P
C
Deep Water Port
Commercial Airport
Railway
Rail Station
Major Highway
Private Airport
C
P
§ All infrastructure is in place
§ Easily accessible by air, road, rail and ports
§ Extremely competitive transportation costs for off-
takers given PV’s location and nearby infrastructure
§ Power: Connected to CFE grid to the mine owned
and maintained substation with continuous capacity
of 25 MW; CDM is CFE’s single largest customer in
the area
§ Water: CDM holds 7 titled water concessions for ~3.9
Mm³/yr while the requirement for the operation of the
PV Mine is ~2.0 Mm³/yr

6. 6
Cobre del Mayo Highlights
COBRE DEL MAYO 6
10
Reasonable leverage, very strong credit metrics by comparison with other B/B3 rated
companies
Very attractive yield/risk relationship vs. similarly rated mining companies
Implementing low capex program to achieve a significant reduction in C1 cash
costs
Long life mine of over 17 years in favorable location with fully developed
infrastructure in attractive mining jurisdiction
Experienced management and operational team with a proven industry track record

7. 7
!543!!
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2009! 2013!2012!2011!2010! 2014!
Acquisi'on*by*
Invecture*
Conversion of Piedras Verdes Mine to Stable Operation
COBRE DEL MAYO 7
16
§ Changed from contract mining to owner operation and purchased the former contractor’s equipment fleet
§ Purchased, re-engineered and installed a crushing, screening, conveying and stacking system
§ Conversion from truck dump Run of Mine (ROM) to a primarily crush-conveyor stacked heap leach
§ Undertook the successful re-characterization and modeling of alternative styles of mineralization styles to
facilitate improved ore control and better Cu recovery
§ Developed new mining & processing plans and implemented an effective ore quality and grade control system
§ Implemented selective mining of high grade chalcocite ores and sale of ore to Kupari Metals
Monthly Production Evolution (t)
Key Initiatives Implemented Post Acquisition

8. 8
Ore for
Flotation
Stable Low Risk Operations and Processes
§ $270.0M in capex has been invested since 2009 with limited maintenance capex going forward, estimated at
$15M/yr LOM
§ Ore processing method is chosen according to grade, mineralization, and leaching and flotation characteristics
to provide the best overall economics using: (i) ROM heap leach (ii) Crushed ore heap leach (iii) Sale of ore for
concentration
COBRE DEL MAYO 8
16

9. 9
Strong Track Record of Safety, Environmental, Community and Labor Relations
COBRE DEL MAYO 9
§ Safety, environmental compliance and labor relations are key areas of focus of CDM
§ Since acquisition, Piedras Verdes has had a solid safety track record
— CDM pays the lowest premium for “Riesgo de Trabajo” (worker risk) as classified by IMSS, demonstrating
the safety standards at CDM
§ Piedras Verdes complies with all applicable environmental standards that are among the world’s most
advanced
§ Labor relations:
— Large pool of nearby qualified labor from Navojoa and Alamos
— Approx. 377 of our 874 employees are represented by the Confederación de Trabajadores de Mexico
(“CTM”) which is one of Mexico’s largest unions characterized by constructive and open approach towards
labor relations (unlike SNTMMSSRM)
— No work stoppages in the history of the Piedras Verdes Mine
§ Certified as a Socially Responsible company by the Mexican Center for Philanthropy (Centro Mexicano para la
Filantropía) and certified as a Clean Industry by the Mexican Federal Attorney for Environmental Protection
(Procuraduría Federal de Protección al Ambiente), the enforcement arm of the Mexican environmental ministry
28

10. 10
Ore (kt) Grade (%) Total Cu (t)
Ore to ROM 232,292 0.149 345,890
Ore to Crushing 190,487 0.307 584,180
Ore for Concentrate 54,999 0.567 311,587
Proven & Probable 477,778 0.260 1,241,657
Waste 418,540
Strip Ratio 0.90 x
Ore (kt) Grade (%) Total Cu (t)
Measured 210,738 0.264 557,000
Indicated 326,205 0.243 793,404
Total M + I 536,943 0.251 1,350,404
Inferred 147,658 0.246 362,368
Total Resource 684,601 0.250 1,731,042
Estimated Reserves
Resources
1,242
1,731
0
200
400
600
800
1,000
1,200
1,400
1,600
1,800
2,000
Mar. '08 Dec. '09 Dec. '11 Sep. '12 /
Current
Reserves Resources
17+ Year Mine Life
COBRE DEL MAYO 10
§ Since the acquisition of CDM by Invecture, Management has increased total mineral resources by 110% to
over 685 Mt and CDM’s mine life has extended from less than 9 years to over 17 years
§ Management has significantly increased mineral resource estimates based on successful exploration and
drilling programs
§ Overall pit shape used to define the minable resources is based on a $2.50/lb copper price
§ 157 additional drill holes will be included in a new model to be completed in Q3, with a new reserve estimate in
4Q. The following table will be updated at that time. Current expectations are that relative to the table below,
there will be a small decrease in ROM ore and an offsetting increase in Crush and Flotation Feed Ore
18
Mine Plan & Resource Evolution (Total Cu, Mt) Summary of Estimated Mineral Reserves and Resources

11. 11
$78.2 $197.7 $238.2 $225.2 $210.0
$26.8
$35.4
$3.28 $3.91
$3.57
$3.31 $3.22
$0.00
$1.00
$2.00
$3.00
$4.00
$0
$75
$150
$225
$300
FY 2010 FY 2011 FY 2012 FY 2013 1Q14 LTM
$/lb
$M
Cathode Sales ($M) Sales of Ore ($M) Cu Price ($/lb)
$26.0 $65.6 $105.7 $92.0 $83.3
33% 33%
44%
37%
34%
0%
10%
20%
30%
40%
50%
$0
$25
$50
$75
$100
$125
FY 2010 FY 2011 FY 2012 FY 2013 1Q14 LTM
%
$M
EBITDA ($M) EBITDA Margin (%)
Cobre del Mayo Today
§ The PV Mine has been transformed into a high quality copper producing asset
— PV has been operating at an average of 82 tpd of copper cathode for the past 28 months (as of 30May14)
— LTM 1Q14 sales totaled $245.4 M
• Cathode production of 29,177 t generating $210.0 M of sales
• Copper contained in ore totaled 17,654 t generating $35.4 M of sales
— LTM 1Q14 EBITDA of $83.3M
— Strong credit metrics1:
• Leverage is 2.68x Net Debt / LTM EBITDA (1Q14)
• Capitalization is 56.1% Debt / Total Capitalization (1Q14)
— Strip Ratio has declined from 3.2x in FY 2012 to 2.1x during 1Q14 due to increased ROM production
COBRE DEL MAYO 11
13
1. Considering total debt of $241.1M (weighted average interest rate of 10.34%) and $17.5M of Cash and Equivalents
2. Does not include copper contained in ore sold for concentrate
Cathode & Ore Sales2 EBITDA and EBITDA Margin

12. 12
Relevant Agreements and Risk Containment
COBRE DEL MAYO 12
Copper Cathode
§ Trafigura and CDM have entered into a 18-month agreement for 100% of CDM’s
cathode production (expires Dec14)
— Cathode sold FOB at the mine and paid twice per week against holding certificates
§ Future Bidding Process: Close to termination date CDM will conduct a competitive
process to select a purchaser for 100% of the copper cathode. In previous processes,
contracts usually have lengths of 6 to 18 months and we have received proposals
from 4 to 6 different trading companies
Ore for Concentrate
§ CDM committed to sell copper ore to KM and KM to purchase and process it
— Purchase Price of Ore: Purchase of the ore is a function of the copper recovered
and the current LME copper price with certain freight, handling and operating
charges
— Term: Initial fixed term of 10 years and provides for renewals
— Volume: Since April, 2013, CDM has sold an average of 4,826 tpd with 45.5 tpd of
copper contained
24
Mining Concessions
§ We have the exclusive right to explore and exploit 30 mining concessions with an
initial term of 50 years which terminate on various dates between 2043 and 2062
— 25 mining concessions owned by Minerales Frontera Cobre del Mayo (“MFCDM”)1
— 5 mining concessions owned by Grupo Rexgo. The right to exploit these
concessions is governed by a contract subject to arbitration
§ Royalties: MFCDM and Grupo Rexgo charge a 3.0% over net sales royalty to CDM for
the copper extracted from those concessions
§ Land Ownership: CDM owns all of the land at is mine in addition to a reserve for leach
pad expansion and waste dumps
Notes:
1. Minerales Frontera Cobre del Mayo SA de CV is a Restricted Company for purposes of the Indenture according to the Supplemental Indenture dated February 6, 2014.

13. 13
Relevant Agreements and Risk Containment (cont’d)
COBRE DEL MAYO 13
24
Insurance Policy
§ Insurance policy coverage for commercial loss / operational stoppage
— Policy underwritten by Allianz with general coverage of between $130 M to
$200 M for losses from business interruption / stoppage
$100 M Committed
Credit Line
§ $100 M undrawn, unsecured committed credit line with Banco Azteca to reduce
refinancing risk
§ Available through 2021, subject to financial ratio covenants
§ Rate: Libor + 6.50%
Mining Tax
§ Mexican government implemented a special duty on mining concessions roughly
equivalent to 7.5% of EBITDA starting January, 2014
§ As roughly 95% of CDM ore is derived from Grupo Rexgo mining concessions, tax
is payable by the concession holder in respect to its EBITDA
Hedging
Arrangement
§ 12 month forward sale agreement from July 2013 to June 2014
— 2,400 t per month @ a fixed price of $7,089/t (approximately $3.22/lb)
— Cash settlement, no margin
§ 12 month forward sale agreement from July 2014 to June 2015
— 600 t per month @ a fixed price of $6,870/t (approx. $3.12/lb)
— Cash settlement, no margin

14. 14
$0.00$
$1.00$
$2.00$
$3.00$
$4.00$
$/lb$
Paid Metal (Mlbs)
<$1.28 <$1.67 <$1.97 <=$3.50
CDM 1Q14 LTM
$1.91/lb
8,400 16,800 25,200 33,700
$3.63 $2.69 $2.08 $1.99 $1.91
$0.00
$1.00
$2.00
$3.00
$4.00
FY 2010 FY 2011 FY 2012 FY 2013 1Q14 LTM
$/lb
Competitive and Stable Cash Cost
COBRE DEL MAYO 14
16
Cobre del Mayo Historical C1 Cash Cost
4Q 2013 Estimated Global Copper C1 Cash Cost Curve1
§ Cobre del Mayo C1 cash costs are currently in the industry’s third quartile
1. Source: Wood Mackenzie

15. 15
4Q14
Low Capex Path to Achieve a Significant Reduction in C1 Cash Costs
COBRE DEL MAYO 15
16
§ Cu production and recovery improvement projects will reduce unit cost by increasing Cu production and
lowering opex without major capex/opex commitment:
- The 400 Ha of
adjacent land east of
PV property will
enable significant
reduction in haul
distance
Purchase of land for
waste dumps
Benefit
When
Capex
Crusher fines
processing system to
recover coarse to
leach
Installation of titanium
anodes in EW tank
$2.0 M
- Improved recovery
in high clay fines
- Improved ROM
recovery
- Increase Cu
production by 3.5
tpd
3Q14 - 4Q14
$2.0 M
- Reduce electricity
consumption by
12%
- Increase in effective
nameplate capacity
to 100 tpd
From 4Q14 to 1Q16
$6.0 M
Fine Crushing of
Higher grade ore with
portable crusher
- Crushing 3.5ktpd of
finer ore will
increase Cu
production by 2.5
tpd
3Q14
$0.5 M
The above data reflect preliminary estimates which will vary when the respective projects are in stable operation

16. II. Operational Environment

17. 17
Stable Operating Environment in Mexico
COBRE DEL MAYO 17
§ Mexico is an economic leader in Latin America and is the world’s 14th largest economy by GDP
— 2014E and 2015E real GDP growth of 3.4% and 3.8%, respectively
— High degree of political stability
— OECD/WTO country and member of 12 free trade agreements, including NAFTA
— Mexican Peso has long history of one of the ten most traded global currencies
§ Mexico is recognized as a mining friendly jurisdiction
— Largest producer of silver globally (18% of global production)
— 2nd largest producer of zinc in Latin America (2013E production of 600kt)
— 3rd largest producer of copper in Latin America (2013E production of 480kt)
§ As a result of mining-supportive governmental policies, stability, OECD tax regime and abundance of
resources, Mexico has attracted extensive investment from international mining companies
— Over 850 mining companies operate in Mexico; 287 of which have foreign investment, and currently
operate 82 producing projects within Mexico
— ~40% of mine production and ~70% of investments in exploration are undertaken by foreign investors
Sources: IMF, Brook Hunt, World Bank, U.S. Geological Survey
26

18. 18
Sonora,'76%'
Zacatecas,'
12%'
San'Luis'
Potosí,'5%'
Others,'8%'
Sonora,'27%'
Zacatecas,'
24%'
Chihuahua,'
13%'
Coahuila,'8%'
Others,'27%'
Sonora is Among the Most Prolific Mining Areas in Mexico
COBRE DEL MAYO 18
§ Sonora represents Mexico’s most important state in terms of mining production
§ Sonora is one of Mexico’s safest states and the only U.S. border state that has not been significantly affected
by recent violence associated with the war on drugs
27
2013 Total Mining Production in Mexico1 2013 Copper Production in Mexico2
Sources:
1 Secretariat of the Economy
2 National Institute of Statistics & Geography

19. III. Industry and Commodity Overview

20. Jefferies LLC August 2013/
Actual'
2008'
2009'
2010'
2011'
2012' 2013'
2014'
LT''00' LT''01' LT''02' LT''03' LT''04' LT''05'
LT''06'
LT''07'
LT''08'
LT''09'
LT''10'
LT''11'
LT''12' LT''13'
$0.00'
$0.50'
$1.00'
$1.50'
$2.00'
$2.50'
$3.00'
$3.50'
$4.00'
$4.50'
2000' 2001' 2002' 2003' 2004' 2005' 2006' 2007' 2008' 2009' 2010' 2011' 2012' 2013' 2014' 2015' 2016' 2017' 2018' 2019' 2020'
$/lb'
Actual' 2008' LT''00'Actual'Cu'Price'($/lb)' Consensus'Cu'Price'($/lb)''
(as'forecast'during'Q4'of'indicated'year)'
Long'term'price'($/lb)'
'(as'forecast'during'Q4'of'indicated'year)'1'
LT''14'
$2.74'
(1)$
(1) Except 2013, where forecasts are as of 19 August 2013
i
COBRE DEL MAYO 32
Copper Price Forecasts Over Time
§ The market has consistently underestimated the copper price when forecasting long term prices
§ Actual copper prices have been much higher due to continuing shortfalls in supply. Delays in new projects,
supply interruption and declining production from existing mines have been the main drivers
20
Copper Historical Price vs. Forecasts
Source: Broker Research
1. With the exception of 2014’s forecast which is as of 22 May 2014

21. Jefferies LLC August 2013/
21
Incentive Price Drives the Value of Copper
COBRE DEL MAYO 21
§ Investment in large projects is extremely capital intensive
§ The incentive price required to justify investments in the expansion of existing mines and the construction of
new ones is estimated at $3.50/lb ($7,716/t)
— Incentive price considers required Cu price to achieve specified rate of return on expansion capex1
§ Although short term copper prices are unpredictable, the following graph shows that long term copper must
trade above $3.50/lb for global mine copper supply to be maintained
Incentive Prices for Major Projects
Source: Wood Mackenzie
1. Analysis based on long term price required to give a 12.0% risk adjusted IRR on a pre-tax 100% equity basis.
c/lb
Paid Metal (M lbs)

22. Jefferies LLC August 2013/
22
$1.11 $1.62 $2.57 $2.55 $2.39 $2.69
$1.67
$3.42
$4.00
$3.61
$3.32 $3.22
$0.00
$1.00
$2.00
$3.00
$4.00
$5.00
2005 2010 2011 2012 2013 1Q14 LTM
$/lb
C1 Cash Cost 90th Percentile ($/lb) Average Cu Price ($/lb)
Cu Pricing Considerations
COBRE DEL MAYO 22
§ Copper has traded in the market at a premium to the 90th percentile of the C1 cash cost curve
— C1 cash cost as estimated by Wood Mackenzie
Source: Wood Mackenzie, LME
1. 90th percentile as estimated by Wood Mackenzie. LME prices for 2013 4Q. May, 2014.
C1 90th Percentile Costs vs. Cu Price1

23. 23
Realized(Cu(Price 1Q14(Sales 1Q14(EBITDA
($/lb) ($M) ($M)
+)$0.50 $64.2 $26.9
+)$0.40 $62.2 $25.0
+)$0.30 $60.3 $23.0
+)$0.20 $58.3 $21.0
+)$0.10 $56.3 $19.0
$3.22 $54.3 $17.0
4)$0.10 $52.3 $15.0
4)$0.20 $50.3 $13.0
4)$0.30 $48.3 $11.0
4)$0.40 $46.3 $9.1
4)$0.50 $44.4 $7.1
Changes(in(Copper(Price
2(
Cobre del Mayo Sensitivity to Variations in Copper Price
COBRE DEL MAYO 23
24
§ We expect the PV Mine to continue to generate positive EBITDA should there be a commodity price disruption
1. Assumes historical 1Q14 performance and excludes hedging
2. Base average sale price of CDM Copper product
Sales / EBITDA Sensitivity to Changes in Copper Price1

24. IV. Historical Financial Performance

25. 25
$3.63 $2.69 $2.08 $1.99 $1.91
30
63
84 83
80
0
10
20
30
40
50
60
70
80
90
$0.00
$0.50
$1.00
$1.50
$2.00
$2.50
$3.00
$3.50
$4.00
$4.50
FY 2010 FY 2011 FY 2012 FY 2013 1Q14 LTM
tpd
$/lb
$78.2 $197.7 $238.2 $225.2 $210.0
$26.8
$35.4
$3.28 $3.91
$3.57
$3.31 $3.22
$0.00
$1.00
$2.00
$3.00
$4.00
$0
$75
$150
$225
$300
FY 2010 FY 2011 FY 2012 FY 2013 1Q14 LTM
$/lb
$M
Cathode Sales ($M) Sales of Ore ($M) Cu Price ($/lb)
29.8
62.6
84.1 83.3
79.9
36.7
48.4
0
20
40
60
80
100
FY 2010 FY 2011 FY 2012 FY 2013 1Q14 LTM
tpd
Cathode Production (tpd) Copper contained in ore sold (tpd)
Summary Historical Financials
COBRE DEL MAYO 25
34
Total Sales and Realized Cu PriceCathode Produced & Copper Contained in Ore Sold
$87.3 $135.6 $141.1 $160.0 $158.3
$0
$20
$40
$60
$80
$100
$120
$140
$160
$180
FY 2010 FY 2011 FY 2012 FY 2013 1Q14 LTM
$M
Operating Costs1 C1 Cash Costs
1. Operating cost exclude: Depreciation & amortization, change in Cu process inventory, ARO amortization, and royalties

26. 26
($49.7)
$49.5 $74.3 $50.4 $28.4
($60)
($40)
($20)
$0
$20
$40
$60
$80
$100
FY 2010 FY 2011 FY 2012 FY 2013 1Q14 LTM
$M
$75.7 $16.1 $31.4 $41.6 $54.9
$0
$10
$20
$30
$40
$50
$60
$70
$80
FY 2010 FY 2011 FY 2012 FY 2013 1Q14 LTM
$M
$26.0 $65.6 $105.7 $92.0 $83.3
33% 33%
44%
37%
34%
0%
10%
20%
30%
40%
50%
$0
$25
$50
$75
$100
$125
FY 2010 FY 2011 FY 2012 FY 2013 1Q14 LTM
%
$M
EBITDA ($M) EBITDA Margin (%)
Summary Historical Financials (cont’d)
COBRE DEL MAYO 26
35
Capital Expenditures
EBITDA less Capex
EBITDA and EBITDA Margin

27. V. Conclusion

28. 28
Comparable Issuers:
Hudbay HBMCN 9½
(1Oct20)
B3/B 7.6%
Taseko Mines TKOCN 7¾
(15Apr19)
B3/B 7.1%
Thompson Creek TCMCN 9¾
(1Dec17)
B1/B 5.5%
Conclusion
COBRE DEL MAYO 28
16
Company Ticker Rating YTM1
Cobre del Mayo COBREM 10¾
(15Nov18)
B3/B 10.7%
Thompson Creek TCMCN 7⅜
(1Jun18)
Caa2/CCC- 8.9%
Thompson Creek TCMCN 12½
(1May19)
Caa2/CCC- 9.1%
Source:
Bloomberg
1.
As
of
June
16,
2014
§ Operating mine without new project development risk
§ Favorable logistics and infrastructure
§ Good labour relations
§ Long life of mine of 17+ years
§ Implementing low capex program to achieve a significant reduction in C1 cash costs
§ $100M undrawn, unsecured committed line with Banco Azteca substantially reduces refinancing risk
§ Reasonable leverage, very strong credit metrics by comparison with other B/B3 rated companies
Attractive Yield/Risk Profile vs. Peers: COBREM bonds yield substantially wide of any
reasonable comparable

29. VI. Annexes

30. 30
Annex 1: Corporate Structure
COBRE DEL MAYO 30
8
Represents the guarantors of the notes offered hereby
Invecture Group,
S.A. de C.V.
(Mexico)
Lawrie Associates
(United Kingdom)
Frontera Cobre del
Mayo, S.A. de C.V.
(Mexico)
Servicios
Corporativos del
Mayo, S.A. de C.V.
(Mexico)
Mayoson, S.A. de
C.V.
(Mexico)
Compañía Minera
Frontera Cobre del
Mayo, S.A. de C.V.
(Mexico)
Minerales Frontera
Cobre del Mayo,
S.A. de C.V.
(Mexico)
Servicios Frontera
Cobre del Mayo,
S.A. de C.V.
(Mexico)
Cobre del Mayo,
S.A. de C.V.
(Mexico)
Frontera Copper
Corporation
(Mexico)
100%
100%
100%
71.2%
28.8%
Preferred Shares $11.7 million
ISSUER