Mining involves the movement of uneconomic rock to access ores
and the separation of recoverable metals from ores.
Consequently the largest quantities of waste produced by mining are
associated with waste rock and tailings. In addition to these
"mineral wastes", small quantities of non-mineral wastes are also
produced. Kinross has guidelines, procedures and processes in place
to manage both types of wastes so that the environment is
protected.
Non-Mineral Wastes
We recycle and reuse waste from our operations to the maximum
practicable extent. Materials that cannot be recycled are disposed
of in a manner that is environmentally acceptable and in compliance
with regulations. Waste products include spent batteries,
fluorescent light bulbs, cupels and crucibles, waste oil and spent
solvents and domestic wastes. We have procedures in place at all
sites that outline the proper handling and storage of wastes to
ensure that people and the environment are protected.
Mineral Wastes
In mining, mechanical and chemical processes are used to extract
the desired products - gold and silver - from mined ore. What is
left are residual materials called waste rock and tailings.
Tailings
Consisting of ground rock and residual process effluents,
tailings are a significant waste at most of our mining operations.
At our facilities, tailings are placed into engineered storage
facilities - usually behind dams built on land near the mine, known
as tailings dams. After mining stops at a site, tailings dams are
decommissioned and reclaimed to ensure that they become a part of
the post-mine land use and pose no hazard to the public or
environment.
The objective of our tailings management program is to design,
build and operate tailings structures that are:
- physically stable under all anticipated conditions and that
meet regulatory and engineering guidelines;
- chemically stable, such that the quality of any seepage or
surface run-off does not endanger human health or the environment;
and
- able to be closed at the end of mine life in a manner
compatible with the surrounding land use, and which have a minimal
impact on the environment.
In addition to annual reviews by the Engineer of Record, all
of our tailings facilities are periodically reviewed by an
independent engineer, to further ensure that these facilities are
meeting our objectives for stability and safety.
Waste Rock
Each operation is required to maintain a waste rock management
plan that includes procedures to identify and manage materials that
may be subject to leaching, including acids, metals or other
substances that could potentially impact surface or groundwater.
Waste rock piles are designed and constructed to be stable. We have
company-wide systems to regularly monitor and inspect waste piles
to ensure that they are being maintained in accordance with our
standards. If waste rock is geochemically suitable, in some cases
it can be used as a source for fill, road base or other
construction purposes.