A OPEN PIT MINING AÇIK OCAK MADENCİLİĞİ

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IPC unit, but this is not within the scope of
this paper. These 2 sites are the candidates
for IPC location. If one of the elected sites
for in pit crushing unit location, is inside the
mine schedule and it must be mined, then the
cost of removing and reinstalling the
facilities placed on that particular site must
also be included in the objective function.
The structure of the corresponding hub
network for this example is given in figure 9.
IPC&C location is depicted in figure 7. In
this section this method is applied to
determine the optimum location of an
IPC&C in Sarcheshmeh copper mine (SCM).
Sarcheshmeh (figure 10) is the largest
copper complex located in 160km southwest
of Kerman in Iran (NICICO, 2013).
Figure 9. Hub network of the problem given
in Fig. 8
In figure 9, C1 and C2 represent the
candidate crusher locations and working
faces are represented by F1, F2, and F3 and
the final destination is shown by the mill
node. Edges connecting the nodes to the hub
node have their own costs and the cost varies
on each direction (in this case the hub node
is the location of the IPC). In other word,
trucks transport the material to the crusher
and travel back to the working face empty,
and this effects the cost of travel between
nodes.
After identifying the candidate sites, and
constructing the represented network of the
problem, the mathematical model can be
solved as an integer programming problem.
The result of the model indicates that which
candidate site has been selected as the
location for the IPC. This procedure is
applied in Sarcheshmeh copper mine to
determine the optimum location of an in pit
crushing and conveying unit.
6 CASE STUDY
In this paper the problem of allocating an in
pit crushing and conveying systems
(IPC&C) is modeled as a single hub locating
problem. The procedure of determining the
Figure 10. Location of Sarcheshmeh copper
complex in Iran
According to mining schedule of SCM
(Fig. 11), about 380 million tons of waste
will be mined within the next 10 years. The
mined waste material will be sent to two
waste dumps located in the northwest and
northeast of the open pit. Sarcheshmeh will
produce approximately 40 million tons of
waste rock per annum from the open pit.
Based on the assessment and comparison of
possible waste handling methods, it is
certain that the in-pit crushing/conveying
method is the more economic method in
SCM than the trucking option. In this mine,
the Mineral Sizer is the suggested crushing
unit for the waste handling system (SRK
Consulting, 2011). The type of the crushing
unit is determined for SCM, but the optimum
location of this unit is not studied yet.
Figure 11. Mining schedule in SCM and the
candidate locations of IPC&C unit
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