A Pit Sequence Optimized With Multi-Pit

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)

A Pit Sequence Optimized With Multi-Pit

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