Antamina Closure Plan: A Top Level Practice. Eng. Antonio Mendoza, M.Sc., MBA Environmental Manager 2010

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1 Antamina Closure Plan: A Top Level Practice Eng. Antonio Mendoza, M.Sc., MBA Environmental Manager 2010

2 Content Evolution of Environmental Regulation Closure Process Antamina Closure

3 Evolution of Environmental Regulation

4 Current Regulation Peruvian Environmental Regulatory Development Ley de Áreas Naturales Protegidas / Orgánica para el aprovechamiento sostenible de los recursos naturales Ley del Sistema Nacional de Evaluación y Fiscalización Ambiental (SINEFA) / Rgto. de la Ley del SNEIA / Política Nacional del Ambiente Environmental Code Ley de Tierras Ley Gral. de RRSS ECA s Aire Ley del Sistema EIA (SNEIA) Ley Gral. del Patrimonio Cultural de la Nación Ley General del Ambiente Law establishing the Ministry of Environment / National Water Authority / Implement Water% Air Quality Standards Nueva Ley de Recursos Hídricos / Implementan ECA s Agua Reglamento Ley de Recursos Hídricos Reglamento Ambiental de Actividades Minero metalúrgicas LMP para efluentes y emisiones mineras (2010) Reglamento Ambiental Actividades de Exploración Minera (2008) Public Participation Regulations (2008) Compromiso Previo con el Desarrollo Sostenible / Mine Closure Law Mine Closure Regulations / Environmental Legacies New regulation for Closure Plan and Mining Exploration Fiscalización Minera OSINERGMIN (2010) Medidas para Remediación Ambiental New Maximum Permissible Limits for mining effluents OEFA Environmental Regulatory Development in the Mining Sector

de RRSS ECA s Aire Ley del Sistema EIA (SNEIA) Ley Gral.

5 Environmental management in mining Monitoring Preliminary Environmental Assessment - EVAP Creation of the Adjustment Programme and Environmental Management Presentation and approval of PAMA Mining PAMA Mining PEMA Running of PAMA in smelters and refineries Environmental Impact Assessment Closure Plans Public Participation New Maximum Permissibble Limits for mining effluents Life of mine

smelters and refineries Environmental Impact Assessment Closure Plans Public Participation New Maximum Permissibble

6 Closure Process

7 Closure Regulation According to Closure Regulation each mine must choice Authorized Consultant to develop a closure plan Klohn Crippen Berger Consultants elaborated the Antamina Closure Plan DS No MEM/AAM.

develop a closure plan Klohn Crippen Berger

8 Closure Objectives Safety for local people Geotechnical Stability for mining facilities; Reclamation of landscape Water protection of receiving water from mining process Post closure land uses as comparable as preoperational uses

Water protection of receiving water from mining process

9 Main Steps of Closure Closure plan has these main steps: i) Progressive Closure, during the life of mine; ii) Temporary Closure, in case of temporary stop of activities. iii) Final Closure, Activities to guarantee the best performance when the mining activities ceased. iv) Post - Closure, Monitoring of performance after closure. No less than five years.

iii) Final Closure, Activities to guarantee the best performance when the mining

10 Objectives of Closure The Final Closure objective is to recovery all the impacted areas and check the following items: a) Physical Stability in Long Term. b) Chemical Stability in Long Term. c) Reclamation of impacted areas. d) Alternative uses of recovery areas of facilities. e) Evaluate the future options of recovery area and facilities.

b) Chemical Stability in Long Term. c) Reclamation of impacted areas.

11 Peruvian regulation about Closure Guarantees According to the Mine Closure Regulation, financial guarantees for the closure plan are: a) Letters of guarantee or other equivalent financial mechanisms b) Bond Policies and other insurance, without benefit of discussion, issued by top level national or foreign entities c) Third-party joint bond d) A combination of these.

financial mechanisms b) Bond Policies and other insurance, without benefit of discussion,

12 Antamina Closure Plan

13 Antamina Location Punta Lobitos Minesite Mine site : Located in the Peruvian Andes, Callejón de Conchucos, district of San Marcos, province of Huari, region of Ancash. 270 Km. North-east of Lima. Lima Altitude: 4100 to 4700 meters above sea level. Port Facility: Punta Lobitos Pacific Coastline 300 km North of Lima.

region of Ancash. 270 Km. North-east of Lima.

14 Project History Long history of artisan mining operation 1996 Privatization process 1996 Exploring Assessment 1997 Metallurgical Pilot Plan 1998 Project Start Up 2001 Operations begins - May 2001 Commercial Goal October

Assessment 1997 Metallurgical Pilot Plan 1998 Project

15 Main Closure objectives The closure goals include: General Accomplish of Peruvian regulation. Accomplish of additional EIA commitments Accomplish of additional commitments with communities and other third parties. As far as possible, the design of the closure plan will offer a "passive" closure condition and will minimize the care and maintenance requirements to.

Accomplish of additional EIA commitments Accomplish of additional commitments with

16 Closure Criteria Open Pit The pit will not be filled out at closure. Waste Rock Dump Rock dump overall slope should be stable in the long term. Tailings Dam Verify that the slope stability of the dam is sufficient to withstand the maximum credible earthquake. Criterion for the Geochemical Stabilization The objectives of water quality for site effluents are the maximum permissible levels of mining effluent discharge, set out in the effective legislation.

Tailings Dam Verify that the slope stability of the dam is sufficient to withstand the maximum credible earthquake.

17 Closure Criteria Criteria for Revegetation Revegetation is carried out according to defined land use at closure. Criteria for Aquatic Habitat Rehabilitation Maintain the quality of surface water bodies located near the project area. Social Programs Includes the development of optimal social programs in order to mitigate and / or prevent potential negative social impacts related to project closure. Community participation in the implementation of land use at closure is important to ensure sustainability of the ecological environment.

Social Programs Includes the development of optimal social programs in order to mitigate and / or prevent potential negative social

18 Closure Criteria Table 1.8 Design criteria for physical stability

19 Closure Criteria Criteria for Revegetation We will be able to update the water Quality standards according to new regulation

20 Post-Closure Criteria Criteria for Post-Closure stage Implementing monitoring programs of surface water and groundwater. Passive maintenance of reshaping works after the first rainy season. Surveillance of the study area during the monitoring and maintenance. Social monitoring of the surrounding communities and the radius of influence of the study area. Evaluation of environmental quality results in soil and water components after the first year of remediation of environmental legacies.

Surveillance of the study area during the monitoring and maintenance.

21 Antamina approach Antamina is developing the following researches: Waste Rock Research In collaboration with The University of British Columbia and Teck. Geochemical and hydrological behavior of waste rock. Antamina has implemented a research with field experimental waste rock piles and field cells under site conditions. Input to improve the waste management during the operational activities. Cover Study Research To identify the most efficient cover to reduce the oxygen diffusion and water infiltration. Test Plots Study To identify the best option for revegetation using the less tick of top soil to be used during closure

22 Waste Rock Study

23 Test Plot

24 Antamina approach To prevent failures in the closure plan, Antamina has decided to: Identify the components of greatest impact on the closure plan: Tailings dam Physical impact / Chemical impact Waste Dumps Physical impact / Chemical impact Open pit Physical impact / Chemical impact Develop studies and activities required to manage the physical impact: likely to be built and maintained in the long term. Develop self-research to control the chemical impact of the closure plan. Confirm the sustainability of activities in the long term.

25 Closure Components

26 Financial Guarantee of Closure According to the Mine Closure Law It is the duty of the mining companies to provide financial guarantees for the closure of mines.

27 Thank You! Av. El Derby 055, Torre 1, Piso 8. Santiago de Surco. Lima 33 - Perú Telf. (51-1)

Water resources management at the mining industry in Chile

Water resources management at the mining industry in Chile Alejandra P. Acuña *, Reinaldo Peñailillo Environmental Group, Golder Associates S.A., Santiago, Chile, Project Engineer, 56-2 26162347, aacuna@golder.cl