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D&B FocusJune 2011

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Blast Design

Costs

Drills

Field Controls

QA/QC Planning / Scheduling

Storage

Contracts

CIP _ Continuous Improvement Program

Focus

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Blast Design

PREVIO

US

BLAS

T

P

REVIOU

S

BLAST

PRECONDITIONING

EFFECT

UN-BLASTE

D

Issue:

Shots terminating along the zigzagof the rows tends to precondition theun-blasted area, resulting in oversize.

If the un-blasted area has been drilledout, the adjacent holds have atendency to suffer from dislocation.In the event the un-blasted area hasnot been drilled drilling is difficult.

Remedy:(We now)Terminate shots alongechelons.

Fac

e

Fac

eUN-BLASTE

D

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Blast Design

Blast Block Geometry Areasof Focus:

Terminate along echelonsUniform Faces (unlike Fig 1.)

In addition bring into thedesign proposal/checking Blast Length to Pit WidthRatioBlast Length should be no

less than 3 times the width.Our blasts are commonly 70mts wide therefore ourminimum length should be210 mts. This rule is basedon Burden Relief & preventing

Preconditioning.

H Pit

Fig 1.)

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Blast Design

Note, Holes vary from 4 metres to 70 metresBurden & Spacing (Diameter) as the parameters relate to BenchHeight requires closer attention Blast design checker:

Blast Design Checker (Hole by Hole V1).xlsx

Design parameters influenced by

Bench Height

http://opt/scribd/conversion/tmp/scratch6130/Blast%20Design%20Checker%20(Hole%20by%20Hole%20V1).xlsxhttp://opt/scribd/conversion/tmp/scratch6130/Blast%20Design%20Checker%20(Hole%20by%20Hole%20V1).xlsx

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Stemming

Stem higherpercentage of holeswith importedproduct, particularlythose withinSandstone bands.

Drill Cuttings VsGravelEstablish site specificminimum stemheights for each

medium.

Loading stem material to be delivered to

the bench

Gaspressure

Stemming ejection time ms

20 30%No stemming ejec

Stemming ejectio

5 10ms

Blast Design

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Costs

Costs Design Vs Actual:

Design costs generated at the design stage, then overlaid to budget.Later to be overlaid to actual.

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Field ControlsWater

Control:

Planning fora rain event.

Broken

Stock

Bunds preventing waterflow

Blast holes covered by

water

H Pit May 2011

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25Mts.

Field ControlsClean ups:

Performed once,eliminate rework.

T Pit May 2011

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Field ControlsClean ups Summary:

Thiess & Golding's depart mining location not leaving bench in a drillablestate

Timely manner cleans up not performed in sync with drill rigsfinishing/starting new pattern

Allocation of resources weekly meeting does not identify equipmentrequired

Responsible Supervisor - weekly meeting does not identify equipmentrequired

Due date - weekly meeting does not identify equipment required

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Drills

5degrees

Angle Drilling:Vertical holes are not drilledvertical they are drilled at 5degrees from vertical. Theorientation of this angle is dictatedby the driller.

This would mean the toe of a 45metre blast hole would be 3.9 mtsfrom design location, etc..

Drill monitoring systems installedbut not in use on two rigs.

Action Plan:Test units (are they working)Train (2) operators (at first)Engage HPGPSCollect data with focus on rockrecognition