2

El Tapado east and west

Antonio Maqui Maqui

Kupfertal

Yanacocha Verde

Chaquicocha

YANACOCHA DISTRICT - SULFIDE PROJECTS

Location map

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Chaquicocha SulfideUnderground Drilling Scenario for Reserves

- Main Body -

Scenario utilizes as much massive silica as possible and stays above the water table 3790.Drill laterals at 3800 level.Some argillic would likely be encountered in first 400m.Drill spacing planned at 25m - optimum determined from drill spacing simulation study.Geotechnical drilling likely required along decline route – minimum 10 holes.

Grid = 200m

Massive Silica

CHAQUICOCHA SULFIDE

UNDERGROUND DRILLING SCENARIO

DISADVANTAGES

-Rock quality problem, native sulfur

-Water table issues, PAG

-Time to targeting access is longer than surface

-Safety issues, prepare people to operate new method work.

ADVANTAGES

-More accurate to test the targets

-Facilitate the geology understanding in gold high grade (Coarse gold).

-Less cost than drilling surface ???

-Facilitate the gold high grade underground targets exploration

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 Tonnes

(T)

Cu grade

%

Initial Target Endowment Cu

Mlbs

Au grade

g/t

Initial Target Endowment Oz

Total 8,384,000 0.30 55 7.70 2,075,549

CHAQUICOCHA UNDERGROUND RESOURCES

December 2009

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Potential Chaquicocha Sulfide Underground Development TimelineAssumes S3 Decline from SE Oxide Pit Wall, S3 & S4 Combined

Gate Duration (yrs)Stage 1 Business Evaluation: Advance Viable Business Opportunity Q1 2010 0.5

Stage 2 Business Evaluation: Determine if Business Case Exists Q4 2011 2S2 Decline Design Q4 2010 - Q3 2011

S2 Decline Permitting Q3 2011 - Q3 2012

Pilot Process Plant Q1 2011 - Q3 2011

Declare NRM (portion of main ore body) Q4 2011

Stage 3 Scope Development: Select a Single Option to Achieve a Business Case Q2 2014 2.5Initial Exploration Decline (~800m) Q4 2012 - Q3 2013

Reserve Drilling (Pit surface low angle + underground drilling) Q1 2012 - Q3 2013

Start Project Permitting Q1 2014

Stage 4 Project Definition Single Option, Ensure Predictable & Competitive Q4 2015 1.5Final Plant Design Q2 2014 - Q3 2015

Final Mine Design Q3 2014 - Q3 2016

Declare Reserves (portion of main ore body - 2 yrs production minimum) Q4 2014

Stage 5 Execution: Construction & Commissioning Q1 2018 ~2

Conclusion: Timeline yields a production when YGM still processing Deep Transition stockpiles.8 years

Notes: 1. Feasibility Design on Plant in 2011 after determining flow sheet options in 2010, skips a pre-feasibility design phase.2. Decline in 2013 after some NRM declared.3. NRM declaration in 2011 based on Stage 2 surface drilling and feasibility plant design. 4. Permitting for both decline & project run independent of CEP.5. Basic process plant design based on S2 mine design as cannot afford to wait for decline development, would result in 1.5 yr delay.6. Final design engineering starts in advance of Gate 4.

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CHAQUICOCHA UNDERGROUND DESIGN

9

CHAQUICOCHA UNDERGROUND DESIGN

100

CHAQUICOCHA UNDERGROUND

DRILL PROGRAM 2010

11

Shape 2.5

slotes

CHAQUICOCHA UNDERGROUND

DRILL PROGRAM 2010

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Potential Chaquicocha Sulfide Underground Development TimelineAssumes S3 Decline from SE Oxide Pit Wall, S3 & S4 Combined

Gate Duration (yrs)Stage 1 Business Evaluation: Advance Viable Business Opportunity Q1 2010 0.5

Stage 2 Business Evaluation: Determine if Business Case Exists Q4 2011 2S2 Decline Design Q4 2010 - Q3 2011

S2 Decline Permitting Q3 2011 - Q3 2012

Pilot Process Plant Q1 2011 - Q3 2011

Declare NRM (portion of main ore body) Q4 2011

Stage 3 Scope Development: Select a Single Option to Achieve a Business Case Q2 2014 2.5Initial Exploration Decline (~800m) Q4 2012 - Q3 2013

Reserve Drilling (Pit surface low angle + underground drilling) Q1 2012 - Q3 2013

Start Project Permitting Q1 2014

Stage 4 Project Definition Single Option, Ensure Predictable & Competitive Q4 2015 1.5Final Plant Design Q2 2014 - Q3 2015

Final Mine Design Q3 2014 - Q3 2016

Declare Reserves (portion of main ore body - 2 yrs production minimum) Q4 2014

Stage 5 Execution: Construction & Commissioning Q1 2018 ~2

Conclusion: Timeline yields a production when YGM still processing Deep Transition stockpiles.8 years

Notes: 1. Feasibility Design on Plant in 2011 after determining flow sheet options in 2010, skips a pre-feasibility design phase.2. Decline in 2013 after some NRM declared.3. NRM declaration in 2011 based on Stage 2 surface drilling and feasibility plant design. 4. Permitting for both decline & project run independent of CEP.5. Basic process plant design based on S2 mine design as cannot afford to wait for decline development, would result in 1.5 yr delay.6. Final design engineering starts in advance of Gate 4.

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