antamina closure plan - mineclosure 2010 · “antamina closure plan: a top level practice” eng....
TRANSCRIPT
“Antamina Closure Plan:
A Top Level Practice”
Eng. Antonio Mendoza, M.Sc., MBA Environmental Manager
2010
Content
• Evolution of Environmental Regulation
• Closure Process
• Antamina Closure
Evolution of Environmental Regulation
Current Regulation
1990 1993 1998 20082002 2003 20051996
Environmental
Code Ley de
Tierras
Ley de Áreas Naturales Protegidas / Orgánica para el
aprovechamiento sostenible de los recursos naturales
Ley Gral.
de RRSS
Ley del
Sistema EIA
(SNEIA)
Ley Gral. del
Patrimonio
Cultural de la
Nación
Ley General
del
Ambiente
Reglamento
Ambiental de
Actividades
Minero
metalúrgicas
LMP para
efluentes y
emisiones
mineras
(2010)
Reglamento
Ambiental
Actividades de
Exploración
Minera (2008)
Public
Participation
Regulations
(2008)
Mine Closure
Regulations /
Environmental
Legacies
Environmental Regulatory Development in the Mining Sector
Peruvian Environmental Regulatory Development
Law establishing the
Ministry of
Environment / National
Water Authority /
Implement Water% Air
Quality Standards
Compromiso Previo
con el Desarrollo
Sostenible /
Mine Closure Law
New regulation
for Closure
Plan and
Mining
Exploration
Fiscalización
Minera
OSINERGMIN
(2010)
2009
Nueva Ley de
Recursos
Hídricos /
Implementan
ECA s Agua
2010
New Maximum
Permissible
Limits for
mining effluents
OEFA
2007
Reglamento
Ley de
Recursos
Hídricos
Ley del Sistema Nacional de Evaluación y Fiscalización Ambiental
(SINEFA) / Rgto. de la Ley del SNEIA / Política Nacional del Ambiente
ECA s Aire
Medidas para
Remediación
Ambiental
Environmental management in mining
1994
1993
1996 20082002
2001 20031995
Environmental Impact Assessment
Closure Plans
Monitoring
Preliminary Environmental Assessment - EVAP
Presentation and approval of PAMA
Life of
mine
Mining PAMA
Creation of the Adjustment Programme and Environmental Management
1997
1998 2000
1999
2004
2005
2006
2007
Mining PEMA
Running of PAMA in smelters and refineries
Public Participation
2009
2010
New Maximum Permissibble Limits for mining effluents
Closure Process
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. 039-2005-MEM/AAM.
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
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.
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.
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.
Antamina Closure Plan
Antamina Location
• 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.
• Altitude: 4100 to 4700 meters above
sea level.
• Port Facility: Punta Lobitos
Pacific Coastline
300 km North of Lima.
Lima
Minesite“Punta Lobitos”
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
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.
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.
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.
Closure Criteria
• Table 1.8 Design criteria for physical stability
Closure Criteria
Criteria for Revegetation
• We will be able to update
the water Quality
standards according to
new regulation
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.
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
Waste Rock Study
Test Plot
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.
Closure Components
According to the Mine
Closure Law
It is the duty of the mining
companies to provide
financial guarantees for the
closure of mines.
Financial Guarantee of Closure
[email protected] You!
Av. El Derby 055, Torre 1, Piso 8. Santiago de Surco. Lima 33 - PerúTelf. (51-1) 217-3000
www.antamina.com