michelle paul presentation(5)

8/13/2019 Michelle Paul Presentation(5)

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OPERATIONAL EXCELLENCE | A WORLD LEADER | STEWARDSHIP

1

Overview

Introduction: CliffsKoolyanobbing Operations

Part 1 - Monitoring dust levelsat the Windarling mine site

Part 2 - Investigating potentialdust impacts to rare flora

Part 3 - Managing dust from

the export of iron ore atEsperance Port

Questions


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Location of Cliffs Koolyanobbing Operations


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Setting and Issues - Yilgarn

High mineral prospectivity and relatively unexplored Significant biodiversity values

Ore bodies typically occur in association withironstone ranges

Ranges support plant species/assemblages withrestricted distributions - dominates environmentalapproval issues


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Ricinocarpos brevis

Tetratheca paynterae


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Windarling DRF locations


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Cliffs Dust Management

Objectives1. Minimise dust emissions

across the KoolyanobbingOperations.

2. Ensure dust emissionsdo not cause a significantdecline in environmental

values of the area,especially to flora ofconservation significance.


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Part 1: Monitoring dust levels at theWindarling mine site


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Monitoring of DRF impacts

1. Visual: General site dust levels2. NPI: Emission estimates of particulate matter;

3. Real-time: Mining activity dust emissions

4. Dust deposition gauges: Passive dust levels

5. Vegetation monitoring: T.paynterae and R.brevis


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Windarling Dust Monitoring Network

10 x dust deposition gaugesalong Windarling W3 ridge

1 x real-time Osiris monitor

W3 PIT


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Dust deposition levels at W3/5 Pit

0

0.5

1

1.5

2

2.5

0 100 200 300 400

DustDepositionLevels

Distance from Mine Pit Edge (metres)

Summer (Nov-Dec 2006)

Spring (Sep-Oct 2006)

Winter (Jul-Aug 2006)


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Windarling mine site dust sources

Wind Erosion

57%

Vehicles

16%

Loading

12%

Dumping

11%

Dozers

2%

Drilling

1%

Blasting

1%


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Part 2 - Investigating potential dustimpacts to rare flora


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Percentage of T. paynterae within each of

the six condition categories (2003-2010)

0%

20%

40%

60%

80%

100%

2003 2004 2005 2006 2007 2008 2009 2010

Year

81-100%

61-80%

41-60%

21-40%

1-20%

0%


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Plant condition not related to proximity to mining Review of 2005 data ie year with largest 1-20%

condition representation

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

10

20

50

60

90

110

120

140

165

190

210

240

275

310

345

385

420

460

500

535

605

730

770

845

885

925

T. paynterae in 1-20% condition category (2005)

%

ofplants

Distance from mine pit edge

Condition of T. paynterae at Windarling


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Number of deaths observed of T.

paynterae between 2004 and 2008

0

1

2

3

4

5

6

7

10

30

80

100

120

135

160

180

200

220

260

440

480

520

865

905

Distance of block from mine pit edge

No. deaths in 2008

No. deaths in 2007

No. deaths in 2006

No. deaths in 2005

No. deaths in 2004


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After 6 years of monitoring (2003-2009),

Western Botanical has concluded:

Overall the T.paynterae plants have maintained their

condition following summer and winter drought periods

by recovering when winter rainfall was high.

Mine generated dust has

had minimal impact on

the Windarling population

during 2004-2009.


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Part 3: Managing dust from the export

of iron ore at Esperance Port


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Iron Ore Dust Contribution to Existing

Dust Levels in Esperance current contribution of iron

ore to existing dust levels is

low, with an average iron

content of approx. 2%

iron ore activities are a minor

contributor to Port dust

emissions Cliffs investigating whether

its iron ore has a unique

signature/fingerprint


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Question Time

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