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water. This takes into consideration the
permissible levels of the sustainability
including the physio-chemical properties,
toxic elements and other Components of
mine water as shown in Figure 5.
Other components
ESImw
Toxic components
Figure 5. Three -dimensional structure of
Mine Water Sustainability
The Mine Water Sustainability Index, is
part of the three-dimensional structure of
the ST, composite for three (3) indicators
and each have lots of sub-indicators
depending on the type, dimension,
localization and other characteristics of
the mining operation.
2.2 Quantitative model of Mine
Water Sustainability Index
ESImw
Physic-chemical
properties
Considering the three indicators of the
mine water sustainability: water physiochemical
properties (MWIfq), toxic
elements (MWIst) and other Components
(MWIo), the Mine Water Environmental
Sustainability index (ESImw) can be
calculated by using the following
expression:
l
l
l
1 ⎛
ESI mw = ⎜∑
MWI fq(
i)
+ ∑MWI st ( i)
+ ∑MWI
n.
l ⎝ i=
1
i=
1 i=
1
(1)
o(
i)
⎞
⎟
⎠
127
Where n is the number of environment
pollutants, l local quantity and ESImw,
MWIfq, MWIst, MWIo are onedimensional
Indices.
To calculate the sustainability index of
each component the condition of
sustainability of each pollutant element
(X and/or X ') based in standard of
sustainability or life quality, given for the
norms. Three criteria are taken
considering the local condition of the
elements or ambient 0 variables (xi):
1) When the sustainability is with
xi < X
2) When the sustainability is with
xi ≥ X
3) When the sustainability is with
X´