Environmental Engineering Reference
In-Depth Information
inserted. But, the stability is temporal, because the wood is in a wet
environment and decay occurs, then, when these wooden bars are decomposed
the heaps are unstable (Figure 1a).
Nowadays, some companies separate the ground material by size, and
build the heap up including the fine sand in the plateau and the coarse sand in
the slope. The heaps are expected to be more stable, reducing the risk of slush
and waste dispersion (Figure 1b). Some intents has been done to control the
slush of the tailing by planting tree species such as
Casuarina equisetifolia
,
Eucalyptus
sp.,
Poplar
sp. or
Schinus molle
, and with some small plants for
example
Agave
sp.,
Opuntia
sp. and grass species, however the survival of the
plants is very low.
Figure 1 (a). Traditional tailing heaps with a mixture of sand, gravel and rock
stabilized with wooden bars, b) recent tailing heaps made up with separated particles
by size.
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