Environmental Assessment
Volume B-6
Mine
Reclamation and Closure Plan
Ambatovy Project
403
January 2006
•
Salvaging topsoil for subsequent site preparation is not practical as the
topsoil properties are not suited for storage (top soil is more root mats
than humus), quantities are insignificant and forest top soil extractability
on ferricrete and transitional substrate is not feasible.
•
A proactive testing and trial program to assist in improving
rehabilitation protocols will be established to optimise rehabilitation
methods and techniques.
6.7.2.1 Proposed Revegetation Phases
Currently, it is believed that the general reclamation approach is best conducted
in four distinct conceptual phases, including:
•
water and erosion control;
•
soil preparation and revegetation;
•
planting native trees; and
•
inducing natural succession.
Considerable opportunity for progressive reclamation exists throughout the
20-year mine life, as well as the subsequent seven years when the low-grade ore
stockpile will be processed. Final closure will involve an “active closure” period
starting in Year 28, in which the bulk of the physical rehabilitation work will
occur, followed by a post-closure monitoring period. For planning purposes it is
assumed that the active closure period will be five years, followed by a post-
closure monitoring period of 10 years (15 years total).
6.8
MONITORING
Post-closure monitoring will involve physical stability monitoring to identify
evidence and/or early indications of erosion and stability issues and/or safety
hazards. In addition, periodic water quality analysis will be conducted to ensure
chemical stability within the area.
