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8/10/2019 A Pit Sequence Optimized With Multi-Pit
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A Pit Sequence Optimized
With Multi-Pit
2007 Dr. B. C. Paul
{NoteThe Name MineSight and the Program described are property ofMintec IncTucson, Arizona}
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Doing it Backwards
Conventional WisdomGet the ultimate pit
Develop Staged Pits that lead to the optimum
The Wang-Sevim ApproachStage pits going forward
When you reach the limit of profitability thenfinalize
Strictly the approach calls for maximum metalpits but taking top X% of ore first approximatesthe same effect and can be done with Multi-Pit
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Mining Rate
As a practical limit around 80,000 to100,000 tons per day is about the limit
Let our rate be 100,000 tons/day
If we run 320 days per year about a limit
Means run about 32 million tons/yearKnow about 15,000 tons/block
About 2,133 blocks per year
1 Billion Tons of Ore Will go in about 32years at this rate
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Fire Up MineSight Economic Planner
Choose
MSOP to run
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3D Block ModelNo Changes from
Previous Run
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Some Adjustments on Limiting Surfaces
I will still use myOptimize file 13
I will still start with
An unmined
Surface
I am not issuing
A command to
Stop at the
Ultimate pit for
This type of
Application(choosing pit 50
As the limiting
Digging surface
Means you are not
Defining a limit).
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Design Variable ScreenNo Change
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I Leave a Bunch of Screens the Same
but I will set my Pit Slope to the working
slope.
I actually had it set this way
From my last run.
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Select MultP as my Design Strategy
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Set the MultP Screen
It will start calculatingPits with the number
You say.
(my previous work
Went to pit 7)
Ill start with Pit 10
It will go step by step
Up to the number
Of pits you specify
(Im going for 40 years
Of design so I put in
49)
It calculates the
Maximum number of
Pit steps.
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I Also Must Set the Range of Blocks to be
Considered
Im
Selecting
The fullRange of
Blocks in
The model.
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Set Your Number of Benches Down in a
Time Period and Minimum blocks moved
size
Im saying 3 benches down
Is my maximum for a year.
I picked 2133 for my
Minimum number of blocks
To take on a pushback.
(You remember my
Calculation a few slides ago).
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Set My Output Instructions
I called this my
Multi-Pit Run
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It Takes Off Running
This may take a while so go get yourself a snack (or go exercise)
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