260
capacity. Equipment fleets (truck and shovel) were calculated to consider only the waste coming straight from the pit and separately the waste re-handling operation.
3 RESULTS AND DISCUSSION
As mentioned before, all results are regarding total operation costs brought to the present value
yearly (NPV), therefore, the smaller negative outcomes represent the better the scenario.
A sensitivity analysis (Figure 4) was made in order to understand how the three main variables (final dump haulage distance (km), loading costs ($/t) and haulage costs ($/t/km)) affect
Figure 2. Waste management strategy for all five scenarios analyzed: base case (conventional method)
and four MSDS possible scenarios.
Figure 3. Block schedule for 10 years period and location of pit exit and established temporary dump
and final dump.
Base Case
MSDS 1
Year
Final
Final
Pit
Dumpl
Pit
Dumpl
Pit
Dump
Dump
--'"'--......._
....c.._
------"'---- ...-...._
--"--.....__
v
__.____
v
v
...._ v
• v
v
v
v
10
v
- -
v _ _a_ v
2.95 km
MSDS2
Final
Oumpl
Pit
Dump
-=_a__
----=-- --- w
--<&___
v
--- v
v
• v
MSDS3
MSDS4
Final
Final
Oump l
Pit
Oumpl
Dump
Dump
-=_a__
-=- --"--=-
----=--
--=v --=-=- ......__
v -=......__
--"---v -=_._ v _ _&_
Block Legend (ore and waste)
•
Year 1 and 2
•
Year 3 and 4
•
Year S and 6
•
Year 7 and 8
Year 9and 10
•
Year>10
capacity. Equipment fleets (truck and shovel) were calculated to consider only the waste coming straight from the pit and separately the waste re-handling operation.
3 RESULTS AND DISCUSSION
As mentioned before, all results are regarding total operation costs brought to the present value
yearly (NPV), therefore, the smaller negative outcomes represent the better the scenario.
A sensitivity analysis (Figure 4) was made in order to understand how the three main variables (final dump haulage distance (km), loading costs ($/t) and haulage costs ($/t/km)) affect
Figure 2. Waste management strategy for all five scenarios analyzed: base case (conventional method)
and four MSDS possible scenarios.
Figure 3. Block schedule for 10 years period and location of pit exit and established temporary dump
and final dump.
Base Case
MSDS 1
Year
Final
Final
Pit
Dumpl
Pit
Dumpl
Pit
Dump
Dump
--'"'--......._
....c.._
------"'---- ...-...._
--"--.....__
v
__.____
v
v
...._ v
• v
v
v
v
10
v
- -
v _ _a_ v
2.95 km
MSDS2
Final
Oumpl
Pit
Dump
-=_a__
----=-- --- w
--<&___
v
--- v
v
• v
MSDS3
MSDS4
Final
Final
Oump l
Pit
Oumpl
Dump
Dump
-=_a__
-=- --"--=-
----=--
--=v --=-=- ......__
v -=......__
--"---v -=_._ v _ _&_
Block Legend (ore and waste)
•
Year 1 and 2
•
Year 3 and 4
•
Year S and 6
•
Year 7 and 8
Year 9and 10
•
Year>10