Agnew Gold Mine · 2018-10-11 · Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012 1 Page head Geographic location IFC 1. Overview IFC 2. Asset fundamentals Page

Agnew Gold MineTechnical Short Form Report31 December 2012

1. OverviewThe Agnew Gold Mining Company (Proprietary) Limited is wholly

owned by Gold Fields Limited and currently holds tenements

covering an area of approximately 57,836 hectares. Agnew is

located some 375 kilometres north of Kalgoorlie in the same

geological region as St Ives Gold Mine, and exploits shear-hosted

auriferous zones from the highly mineralised Norseman-Wiluna

Greenstone Belt.

Agnew represents a solid base for Gold Fields’ growth in the

region and is an important contributor to the stated vision, “To be

the global leader in sustainable gold mining”.

The key strategic goals for the Company are the discovery of

additional Mineral Reserve sources to supplement Waroonga in

the short term, and the discovery of a significant new ore complex

to replace Waroonga in the medium to long term.

Reported Mineral Reserves at Agnew were reduced to 1.2 Moz

from December 2011 to December 2012, mainly due to the

impact of depletion at 182 koz, resulting in an overall decrease

of 147 koz. Changes from December 2011 were dominated by

removal of the Rajah lode and the impact of higher gold price

assumptions for the December 2012 statement.

This Technical Short Form Report reflects the latest Life of Mine

(LoM) plan input parameters, coupled with an updated Mineral

Resource and Mineral Reserve statement as at 31 December

2012. All Mineral Resource and Mineral Reserve figures reported

are managed unless otherwise stated, and Mineral Resources are

inclusive of Mineral Reserves.

Salient t feeata urreses

�� Mineral Resources at 3.5 Moz.

�� Mineral Reserves at 1.2 Moz.

�� Stable Mineral Reserve and Mineral Resource base.

�� Positive results at Waroonga North Project.

�� Mineralised link between Kim and Fitzroy Lodes.

�� Life of Mine extends to 2019 (7 years).

Geographic locationAgnew locality plan with tenements magnified

1Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012 �

Page head

Geographic location IFC

1. Overview IFC

2. Asset fundamentals Page 2

3. Operating statistics Page 3

4. Geological setting and mineralisation Page 4

5. Mining Page 6

6. Projects Page 7

7. Mineral processing Page 7

8. Sustainable development Page 8

9. Mineral Resources and Mineral

Reserves Page 9

10. Competent Persons Page 13

11. Key technical staff Page 14

12. Brief history Page 17

Cover image: Developing ore drive

Note: For abbreviations refer to page 27 and for glossary of terms refer to page 28 – “Mineral Resources and Mineral Reserves Overview 2012”.

��Agnew CIP plant complex (RoM pad and crushers)

Contents

relatively une plored tenements,

Agnew’s strategy is to discover and Agnew’s strategy is to discover and

develop new and extensional Mineraldevelop new and extensional Mineral

R f i i dReserves from its prospective andReserves from its prospective and

relatively unexplored tenements, relatively unexplored tenements,

through target testing, new discovery through target testing, new discovery

and new ta get generation.and new target generation.and new target generation.

2 � Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012

2. Asset fundamentals

Prepared by Gold Fields Limited in compliance with the South African Code for the Reporting of Exploration

Results, Mineral Resources and Mineral Reserves (2007 SAMREC Code)

Effective date 31 December 2012

Source of information This Technical Statement is a summary of the December 2012 Agnew Competent Persons

Report (CPR)

Personal inspection Personal inspection is conducted by the Competent Persons as listed, who are full-time

employees of Gold Fields Limited

Independent review Information reported in this declaration is as reviewed by internal consultants as at 31 December

2012. Agnew has been informed that the review identified no material shortcomings in any

process by which the Mineral Resources and Mineral Reserves were evaluated

General location Agnew is situated at latitude 27° 55’ S and longitude 120° 42’ E in the Norseman-Wiluna

Greenstone Belt, 23 kilometres west of the town of Leinster in Western Australia, which is

approximately 1,100 kilometres north-east of Perth. Well-established power, access roads and

supporting infrastructure are in place

Licence status and

holdings

The Agnew Gold Mining Company Proprietary Limited (AGMC), ACN 098-385-883, was

incorporated in Australia in 2001 as the legal entity holding and conducting mining activity on the

Agnew mineral leases. The Gold Fields Limited Group holds 100% of the issued shares of AGMC

through its 100% holding in the issued shares of Orogen Holding (BVI) Limited. Agnew controls

exploration and mineral rights over a total area of 57,836 hectares (total of granted tenements)

and has security of tenure for all current exploration and mining leases that contribute to future

Mineral Reserves

Operational

infrastructure

One underground complex, mining from two separate ore bodies (Kim South and Main North)

accessed via declines. Centralised administrative office, engineering workshops and one CIP

processing plant (1.3 Mtpa capacity)

Climate No extreme climate conditions are experienced that may affect mining operations

Deposit type Orogenic greenstone gold deposits hosted in a number of different styles of lodes. Although all of

the Agnew deposits broadly occur at the intersections between structures and stratigraphy, there

are subtle differences in alteration and mineralisation, that are controlled in part by the local host

rock chemistry

Life of Mine (LoM) Ongoing extensional and brownfields exploration continues and could increase the LoM. It is

estimated that the current Mineral Reserves will be depleted in 2019 (7 years)

Environmental/Health

and Safety

The mine maintained AS 4801:2000 Occupational Health and Safety Management System

certification and ISO 14001:2004 Environmental Management System certification. Agnew was

certified as fully compliant to the International Cyanide Management Code (ICMC) on 3 June 2009

Reporting codes Gold Fields reports its Mineral Resources and Mineral Reserves in accordance with the 2007

SAMREC Code, The South African Codes for the Reporting of Mineral Asset Valuation (2009

SAMVAL Code) and other relevant international codes such as the United States Securities and

Exchange Commission (SEC) Industry Guide 7, the Joint Ore Reserves Committee (JORC 2012)

Code and the National Instrument (NI) 43-101. The Mineral Resources and Mineral Reserves are

underpinned by an appropriate Mineral Resource management process and protocol to ensure

adequate corporate governance in respect of the Sarbanes-Oxley Act

Diamond drilling core being prepared for geological logging

Portal to Kim underground from Waroonga open pit

Mechanical drillings of blast holes in ore drive

Agnew CIP plant complex


3. Operating statistics

Historic performance UnitsDec

2012

Dec2011

Dec20101

June2010

June2009

Open pit mining

Total mined kt 262 1,612 – – –

– Waste mined kt 83 1,024 – – –

– Ore mined kt 179 588 – – –

Mined grade g/t 1.4 1.6 – – –

Strip ratio (tonnes) waste:ore 0.5 2.1 – – –

Underground mining

Total mined 845 1,283 436 763 946

– Waste mined 222 662 124 182 209

– Ore mined kt 623 621 312 581 737

Mined grade g/t 8.5 9.7 8.4 8.9 7.9

Processing

Mill tonnes kt 943 935 417 883 1,066

Head grade g/t 6.1 7.0 6.5 6.2 5.8

Yield g/t 5.8 6.5 5.9 5.8 5.6

Plant recovery factor % 93.2 94.0 93.7 93.4 92.6

Gold produced

Total gold productionkoz 177 194 80 165 192

kg 5,494 6,035 2,258 4,685 5,253

– Milling koz 177 194 80 165 192

– Heap leach koz N/A N/A N/A N/A N/A

Gold sold oz 177 194 80 165 192

Financials

Operating cost A$/oz 808 691 680 614 526

Total cash costA$/oz 799 675 662 611 541

US$/oz 827 696 621 539 401

Capital expenditure A$ million 60.2 71.8 26.6 62.6 41.6

Notional cash expenditure (NCE)A$/oz 1,150 1,062 1,013 992 743

US$/oz 1,191 1,096 951 875 550

General

Total Employees Costed (TEC) number 505 440 364 375 343

Mineral Reserves Mt 6.0 7.1 6.9 6.7 2.9

Mineral Reserves Head Grade g/t 6.0 5.7 6.0 5.7 7.7

Mineral Reserves Moz 1.2 1.3 1.3 1.2 0.7

Expected Life of Mine years 7 7 7 7 41 Figures shown represent the six months to 31 December 2010. Rounding off of figures presented in this report may result in minor computational discrepancies. Where this occurs it is not deemed significant.

Road train offloading development material at waste dump


4. Geological setting and mineralisation

Agnew is situated in the northern portion of the Norseman-

Wiluna Greenstone Belt, which is part of the Yilgarn Craton,

a 2.6 Ga granite greenstone terrain in western Australia.

The rock types in the belt comprise abundant tholeiitic and

komatiitic volcanic rocks, chert, sulphidic and albitic

sedimentary rocks, and a chain of discrete felsic volcanic

centres. The greenstones of the Agnew area have been

metamorphosed to upper greenschist, lower amphibolite

metamorphic grades. Gold mineralisation is found in quartz

breccia lodes, quartz tensional veining and disseminated

arsenopyrite-pyrite-biotite mineralisation. This is developed

along the lithological contact between a sandstone and

ultramafic conglomerate and on other contacts within the

ultramafic conglomerates package. High-grade ore shoots

plunge steeply to the north along these contacts. The controls

on mineralisation are dilational zones at the intersection of

steeply dipping north-south axial planar structures with the

stratigraphy. The stronger the contrast in rock competency in

these zones, the greater the potential for mineralisation.

Much of the Yilgarn Craton is deeply weathered and partially

covered by Tertiary and Quaternary regolith. Pre-Tertiary

lateritic horizons are variably exposed, stripped or buried by

later deposits that have in turn been lateritised. The depth of

weathering is strongly controlled by original rock types, with

mafic rocks generally being more susceptible to weathering

than felsic rocks.

Local geologyThe Agnew-Wiluna section of the Norseman-Wiluna

Greenstone Belt is bounded by large granitoid bodies and the

In comparison to other greenstone belts in the Yilgarn Craton, the Norseman-Wiluna Greenstone Belt is highly mineralised, particularly in gold and nickel.

Ida Fault to the west. The Ida Fault, locally termed the

Waroonga Shear, is a major regional scale shear zone that

defines the western edge of the Kalgoorlie Terrain. The

majority of the Agnew ore bodies are on the western limb of

the Lawlers Anticline, a large open fold, plunging 30° to the

north. However, economic mineralisation is also formed on

the eastern limb (e.g. Vivien), in axial planar positions to the

north (e.g. Cams) and in the adjacent Mt White Syncline

(e.g. Maria).

The Agnew Anticline and the Mt White Syncline are large

scale folds plunging 30° to the north. The dip of the limbs

range from moderate at the nose and shoulders of the folds

(e.g. Waroonga) to steep and slightly overturned along the

limbs (e.g. Songvang).

Although all of the Agnew deposits are broadly hosted by the

intersections between structures and stratigraphy, there are

subtle differences in alteration and mineralisation, controlled

in part by the local host rock chemistry. Songvang is unusual

in its relatively high lead, silver and fluorine content, possibly

reflecting input from tonalite and porphyry intrusions. There

also appears to have been a slight decline in mineralisation

temperatures from south to north through the Agnew area,

associated with the north plunge of the Lawlers Anticline and

resultant erosion of the overlying lower-temperature rocks to

the south. This temperature change is reflected in the

changing mineralisation styles from south to north, with

biotite/garnet assemblages dominating to the south and

quartz veining to the north.

The stratigraphy of the Agnew-Wiluna belt appears to be

broadly similar to the stratigraphy of the Kalgoorlie Region.

The following section provides a detailed description of the

general stratigraphy for the Agnew mining leases and the

stratigraphic location of various ore bodies.

Geology of the Agnew Lawlers Region showing the Agnew anticline

Cams Camp

Maria North

Maria

Vivien

Lawlers

Songvang

Donegal North

Goldilocks

Miranda Fault

Alice

Cinderella North

Waroonga Complex

Surprise

Redeemer-Crusader

Endeavour-South

Target 20U

Pinnacles

Pinnacles South 0 5km

N

Location and geological setting

Derby

NORSEMAN – WILUNAGREENSTONE BELT

YILGARN CRATON

Norseman

Kalgoorlie

Laverton

Leinster

Wiluna

Perth

Adelaide

Hobart

Melbourne

Canberra

Sydney

Brisbane

Cairns

Darwin

WESTERNAUSTRALIA

NORTHERNTERRITORY

QUEENSLAND

SOUTHAUSTRALIA

NEW SOUTHWALES

VICTORIA

Agnew

1000

Kilometres

200 300 400


Regionally, both air core and reverse circulation (RC) drilling

was completed on a number of prospects. Air core drilling

tested one area south of Cams and returned several

anomalous results requiring follow-up work.

RC testing of the Alice project did not repeat the mineralised

intersections returned from the initial two RC holes that were

completed in 2011, with all grades greater than 1.0 g/t only

occurring over single-metre intervals.

Three RC holes were completed to follow up on strongly

anomalous aircore results at Cinderella North, approximately

200 metres north of the Cinderella project. One of the three

holes returned 14 metres at 2.7 g/t from 22 metres.

A total of 80 RC holes were completed at the Zone 2 North

and Zone 2 South projects at Redeemer. The drilling was

designed to test for mineralised extensions, increase

geological confidence and confirm grade continuity. This was

required for the completion of mining proposals for both

projects. Models for both projects will be finalised during

Quarter 1 of 2013, and decisions on the next steps will be

made during the second half of the year.

The success of any exploration project is dependent on the

quality of the exploration data. The ability to extract the

inherent value in the data is also reliant on new technologies to

enhance interpretation and modelling of the data. Agnew

maintains rigorous QA/QC protocols on all of its exploration

programmes. It draws on industry best practice for data

acquisition and utilises accredited laboratories, which are

regularly reviewed, both internally and externally. Analytical QA/

QC is maintained and monitored through the submission of

blanks, certified reference material and duplicates plus umpire

laboratory checks. This ensures sign-off by Competent

Persons under the 2007 SAMREC and 2012 JORC Codes.

Agnew’s resource development strategy will continue to

focus on the Waroonga underground Complex where, over

the past three years, increased understanding of the geology

will help generate new targets in previously untested areas –

immediately north and south of the current mine

infrastructure. This new understanding will also allow for the

review of several areas along the western limb of the Lawlers

Anticline (Waroonga to Songvang) where previous drilling has

not necessarily been as effective as initially thought.

Resource conversion drilling at Waroonga Complex

Exploration and resource definition drillingThere is considerable endowment potential within the current

tenement holdings to add significantly to current Mineral

Resources and Mineral Reserves, through a combination of

on-mine extensions to known Mineral Resource and near-

mine exploration. In terms of the extent of its tenement

holdings and the exploration undertaken thus far, Agnew

cannot yet be considered advanced in exploration terms, and

recent drilling and geological studies continue to highlight the

potential of the Waroonga area to deliver new high-grade ore

sources in close proximity to existing mine infrastructure.

Mine exploration for the 12 months to December 2012

focused on further drill testing of the Waroonga Complex and

a brief return to testing early stage targets identified in other

parts of the AGMC land holdings.

Following the successful identification of high-grade shoots

beneath Main North ( Fitzroy, Bengal and Hastings), and a single

shoot (Yeoman) beneath Main South in 2011, drilling in this area

continued in 2012 to extend known resources and delineate

additional ounces. Drilling to December 2012 confirmed and

extended the FBH interpretation down to the 9,300 mRL, and

highlighted the likely link between the Kim/Edmunds and Fitzroy/

Bengal ore shoots. Mineralisation continues to remain open at

depth and to the south, beneath Main South.

Exploration drilling completed during 2011 and 2012 led

to the discovery of a new mineralised area approximately

500 metres north of the Kim ore body – Waroonga North.

This target was generated from the increased geological

understanding of the Waroonga area and has returned

significant high-grade results over a 100 metre strike length

in an area not previously drill tested.

Exploration drilling and expenditure

31 December 2012 31 December 2011

Operation

Metres

drilled

A$

(million)

Metresdrilled

A$(million)

Agnew Gold Mine 52,531 10.142 51,201 9.820

Exclusive of grade control drilling except where it is included in the capital budget.

Vertical slice schematic of gold mineralisation occurrences

Lawlers Basalt

Agnew Ultramafic

Scotty Creek Sandstone

Granite/PorphyryGold Mineralisation

��

��

Songvang

CrusaderDelivererClaudius

Redeemer

Vivien

Kim/Rajah/Main

Zone2/3

New Holland/Genesis

Pilgrim


Mining methods Access to the Waroonga underground mine is via a portal

and decline, located in the previously mined Waroonga open

pit. All primary infrastructures, including escape ways and

ventilation shafts, are located in the competent sandstone

of the hanging wall. The dimensions of the decline are

5.5 metres wide by 5.8 metres high, with arched backs to

allow high-capacity trucks to operate.

The Rajah Lode was mined in 2012 using the modified Avoca

Method. This is a variation of bench-stoping methodology

where the fill typically consists of uncemented waste rock

that is introduced to control wall stability at intervals from

20 to 30 metres.

During 2012 the Main Lode North ore body was extracted

using transverse stoping, with mining commencing at the

footwall and retreating to the hangingwall. The stopes

were accessed via a tramming drive developed in the

hangingwall sandstone.

The final northern cutback of the Songvang pit was

completed in February 2012.

Mine planning and schedulingThe current mining areas are situated at Waroonga with

only high-grade ore from Kim South forming the basis for

the 2013 Operational Plan. The plans, design and schedules

are provided and communicated to the mining personnel

and contractors, forming the basis of the contract between

the parties.

At Waroonga, the stope design takes practical stope layouts

into consideration, as well as planning for mining losses in

pillars or other parts of the resource excluded for technical

reasons. Dilution material is included in the stope design. Ore

losses can occur when material cannot be practically

extracted from the stopes.

Datamine’s Mineable Shape Optimiser was used during the

December 2012 Mineral Reserve update. This software

optimises the stope shape by using variable cut-off grades.

5. Mining

The current mining operations consist of the Waroonga Underground Complex which is now

focused on the high-grade Kim South that forms the basis for the 2013 Operational Plan.

Portal and decline to the Waroonga underground from previously mined Waroonga open pit

Mechanical roof-bolting and wire meshing

Example of mine design model

RAW followsdecline

Kim South oblique viewlooking SE


6. Projects

Increasing the Mineral Resources and Mineral Reserves will extend the mine life of the

Waroonga Complex and increase production flexibility by opening new high-grade areas

for exploitation.

A number of improvement projects are scheduled to be completed at Agnew during 2013. Mining will trial the use of emulsion for underground blasting as well as “in-cycle fibrecreting” which aims to increase development rates without compromising ground stability.

Improvements to the current paste fill backbone infrastructure continue to be implemented, while the commissioning of additional water sources and a crusher upgrade will also be completed.

The operation continues to examine and review the possibility of opportunistically exploiting small-scale open pittable deposits for supplementary mill feed. In this regard smaller

open pit opportunities continue to be assessed at Redeemer, Cinderella, Claudius and Songvang.

Future exploration will focus within and immediately around the Waroonga mine area, where new high-grade zones or cycles continue to be intersected. An area between Kim South and the new Waroonga North high-grade intersections has not been drill tested, while significant potential also exists south of the recently discovered Fitzroy, Bengal and Hastings Lodes. The objective is to discover and bring into production additional high-grade ore sources to supplement the high-grade Kim South ore and to utilise available processing plant capacity.

7. Mineral processing

The comminution circuit comprises a contractor-owned and operated three-stage crushing plant, feeding a fine ore stockpile, ahead of a two-stage closed circuit ball milling circuit. Milled ore proceeds to a three-stage leaching train feeding the six-stage carbon in pulp (CIP) circuit. Carbon elution is by pressure Zadra with gold being electro-won and smelted. In February 2003 a gravity circuit was retrofitted. It comprises a Knelson gravity concentrator and an intensive leach reactor (ILR) for intensive cyanidation of the gravity concentrate. The gravity circuit was upgraded and retrofitted in September 2011 to incorporate a second 26” Knelson gravity concentrator, an ILR 2000BA and two Magscreen 1000 units. The processing capacity at the plant is 1.3 Mtpa.

Quantitative analysis of recovery improvements will be evaluated and included in future Mineral Resources and Mineral Reserve calculations in accordance with the grade/recovery model currently adopted.

Tailings disposal and impoundment have historically been to a conventional dam constructed using the upstream lift method sourcing wall material from dried tailings. The original tailing storage facility (TSF) was located in an area some 1.5 kilometres south-west of the Agnew plant. Deposition to this facility ceased in early 2004 and a large section of this decommissioned facility has been capped with waste rock. The remaining exposed sections are being harvested for use as underground paste fill. Following completion of mining activities at the Redeemer Mine, the abandoned pit has been converted to a tailings storage impoundment for tailings

arising from the Agnew plant (TSF3). Although situated seven kilometres south of the Agnew plant, the static head is negative, and pumping of the tailings material is therefore done at no additional cost from the previous deposition technique. The pontoon-mounted decant pump recovers water from the supernatant pond, which forms due to liberation of water from the tailings slurry as it settles and consolidates.

TSF3 is projected to last until 2015, based on deposition rates of 1.3 million tonnes per annum and historical deposition levels from December 2004 to February 2011.

Agnew CIP plant complex

The Agnew six-stage CIP circuit has a processing capacity of 1.3 Mtpa.

LoM tailings storage facility assessment

Mining asset

LoM

deposition

(Mt)

Available

capacity

(Mt)

Surplus/

(shortfall)

(%)

Capital

requirement

A$ (million)

Agnew 3.6 6.6 45 5


Safety statistics

Class Units Dec 2012 Dec 2011 Dec 20101 June 2010 June 2009

Fatalities number – – – – –

Fatality rate per mmhrs – – – – –

LDIFR2 per mmhrs 3.9 2.7 1.1 4.6 –

1For six months to December 2010.2Lost Day Injury Frequency Rate.

8. Sustainable development8. Sustainable development8. Sustainable development

In Australia, large advances in safety have been made

over the last 20 years. There is a strong focus on the

human behavioural aspect of safety in driving a positive

safety culture.

Agnew has been certified OHSAS 18001:2004, through the

Australian Standard AS/NZ 4801:2001.

Gold Fields’ Australian operations are guided by individual

safety policies that have been developed within the Group

policy framework. These are tailored to suit the site-specific

environmental conditions. Agnew has developed and

implemented an environmental management system, certified

to and compliant with the international ISO 14001 standard.

Agnew team spirit – “Let’s make a difference!”

Environmental monitoring

Agnew mitigates and, where possible, eliminates hazards in the working environment. The

engaged participation of all employees and the application of safe, innovative processes

and technologies, within a framework of full legislative and best-practice compliance remains

a core focus.


9. Mineral Resources and Mineral Reserves

Mineral ResourcesThe Mineral Resources are classified as Measured, Indicated or Inferred, as described in the 2007 SAMREC Code. Mineral

Resource categories are assigned with consideration given to geological complexity, grade variance, drill hole intersection

spacing, and mining development. Kriging neighbourhood analysis is also used to assist with classification. The impacts of

year-on-year changes are covered in the reconciliation section. The following factors apply to the Mineral Resources presented

in this report:

�� All Mineral Resources are declared using a cut-off grade calculated for the individual deposit;

�� The declared Mineral Resources are further tested by the application of modifying factors to ensure that there is a reasonable

prospect of eventual economic extraction;

�� Open pit Mineral Resources comprise the undiluted material above the nominated cut-off within a diluted optimised pit shell;

�� Underground Mineral Resources are selected using a minimum mining width and minimum stope size; and

�� Mineral Resources are quoted at an appropriate in situ economic cut-off grade with tonnages and grades based on the

relevant resource block models. They also include estimates of any material below the cut-off grade required to be mined to

extract the complete pay portion of the Mineral Resource.

Mineral Resource classification

Classification

Tonnes (Mt) Grade (g/t) Gold (koz)

Dec

2012

Dec 2011

Dec 2010

Dec

2012

Dec 2011

Dec 2010

Dec

2012

Dec 2011

Dec 2010

Open pit and underground

Measured 3.9 3.5 4.5 4.71 4.75 4.08 585 540 597

Indicated 12.0 12.9 13.6 4.86 5.31 5.17 1,873 2,199 2,265

Inferred 7.1 7.5 7.4 4.53 4.50 4.15 1,031 1,082 981

Total open pit and

underground 22.9 23.9 25.5 4.73 4.97 4.68 3,489 3,820 3,843

Surface stockpiles

Measured 0.2 0.3 0.0 1.55 1.74 6.29 11 17 2

Total surface stockpiles 0.2 0.3 0.0 1.55 1.74 6.29 11 17 2

Grand total 23.2 24.2 25.5 4.70 4.93 4.68 3,501 3,838 3,845

Portal and decline to Waroonga underground complex

Geological and evaluation models have been updated as at December 2012 to reflect the

latest available data sets. An integrated mine design and schedule, based on current

performance levels, takes cognisance of the inherent risks associated with mining operations

at Agnew.


Mineral Resource classification per mining area

Area

Measured Indicated Inferred Total Mineral Resource

Tonnes

(kt)

Grade

(g/t)

Gold

(koz)

Tonnes

(kt)

Grade

(g/t)

Gold

(koz)

Tonnes

(kt)

Grade

(g/t)

Gold

(koz)

Tonnes

(kt)

Grade

(g/t)

Gold

(koz)

Mill Stocks 1.1 4.75 0.2 – – – – – – 1.1 4.75 0.2

Waroonga – Kim Lode – – – – – – – – – – – –

Waroonga – Main Lode 0.5 3.00 0.0 – – – – – – 0.5 2.96 0.0

Songvang – Songvang

Pit 221.4 1.53 10.9 – – – – – – 221.4 1.53 10.9

Total Stockpiles 222.9 1.55 11.1 – – – – – – 222.9 1.55 11.1

Miranda – Cams Pit – – – 319.2 4.11 42.1 – – – 319.2 4.11 42.1

Miranda – Maria Pit – – – 75.8 4.46 10.9 16.5 1.56 0.8 92.3 3.94 11.7

Total Miranda JV – – – 395.0 4.17 53.0 16.5 1.56 0.8 411.5 4.07 53.8

Waroonga – 450 South

Underground – – – 143.2 2.80 12.9 99.4 2.74 8.8 242.6 2.78 21.7

Waroonga – 450 South

Pit 42.2 2.02 2.7 57.5 5.36 9.9 10.5 2.72 0.9 110.1 3.83 13.6

Waroonga – New

Woman Pit – – – 38.9 2.84 3.6 9.9 3.33 1.1 48.8 2.94 4.6

Waroonga – Kim Lode 956.7 7.08 217.6 2,877.6 7.01 648.7 342.5 4.60 50.7 4,176.8 6.83 917.0

Waroonga – Rajah Lode 248.2 4.66 37.2 386.8 4.73 58.8 104.1 4.14 13.8 739.2 4.62 109.9

Waroonga – Main Lode 1,957.5 4.37 274.8 3,498.4 4.91 552.5 3,085.7 4.88 484.6 8,541.6 4.78 1,311.8

Waroonga – Cinderella

Pit – – – 599.4 1.78 34.3 327.5 1.75 18.4 927.0 1.77 52.7

Waroonga – Main

Hunters Lode – – – – – – – – – – – –

Total Waroonga

Complex 3,204.6 5.17 532.4 7,601.9 5.40 1,320.6 3,979.6 4.52 578.3 14,786.1 5.11 2,431.3

Redeemer – North Zone

2 Pit 151.8 2.08 10.2 219.2 1.53 10.8 0.1 0.36 – 371.1 1.76 21.0

Redeemer – North Zone

2 Underground – – – 66.7 3.39 7.3 367.7 3.30 39.0 434.3 3.32 46.3

Redeemer – Redeemer

Underground – – – 1,233.6 5.98 237.2 1,742.1 5.56 311.7 2,975.7 5.74 548.9

Redeemer – South

Zone 2 Pit 45.7 2.11 3.1 244.4 3.17 24.9 – – – 290.2 3.00 28.0

Redeemer – South

Zone 2 Underground – – – 191.6 3.32 20.4 851.0 3.28 89.8 1,042.6 3.29 110.2

Total Redeemer

Complex 197.5 2.09 13.3 1,955.4 4.78 300.6 2,960.9 4.63 440.5 5,113.9 4.59 754.3

Crusader – Crusader

Pits – – – 749.1 1.83 44.1 4.2 1.63 0.2 753.3 1.83 44.3

Crusader – Claudius

Underground 24.6 9.44 7.5 959.2 4.09 126.3 53.2 2.55 4.4 1,037.0 4.14 138.1

Total Crusader

Complex 24.6 9.44 7.5 1,708.3 3.10 170.3 57.4 2.49 4.6 1,790.3 3.17 182.4

Songvang – Songvang

Pit 435.9 2.28 32.0 322.1 2.75 28.5 70.0 3.19 7.2 827.9 2.54 67.7

Total Songvang

Complex 435.9 2.28 32.0 322.1 2.75 28.5 70.0 3.19 7.2 827.9 2.54 67.7

Total 4,085 4.54 596 11,983 4.86 1,873 7,084 4.53 1,031 23,152 4.70 3,501


Modifying factors�� The Measured and Indicated Mineral Resources are

inclusive of Mineral Reserves;

�� Mineral Reserves are quoted in terms of RoM grades and

tonnages as delivered to the metallurgical processing

facility and are therefore fully diluted;

�� Mineral Reserve statement includes only Measured and

Indicated Mineral Resources, modified to produce Mineral

Reserves and contained within the LoM plan; and

�� Mineral Resources and Mineral Reserves undergo regular

internal and/or external audits, and any issues identified

are rectified at the earliest opportunity – usually during the

current reporting cycle.

Grade tonnage curves

Grade tonnage curves for the total and open pit Mineral

Resource is presented. The total chart illustrates the relatively

high-grade characteristic of the Agnew camp where historical

grades have been in the region of 5 to 6 g/t.

Agnew grade tonnage curve – underground

To

nnes (m

illio

ns)

Avera

ge g

rad

e a

bo

ve c

ut-

off (g

/t)

0 1 2 3 4 5 76 8 9

Cut-off grade (g/t)

25

20

15

10

5

0

16

14

12

10

8

6

4

2

0

Mineral Resource

parameters UnitsDec

2012

Dec2011

Gold price

US$/oz 1,650 1,450

US$/A$ 1.00 1.07

A$/oz 1,650 1,550

Cut-off for mill feed g/t 0.3 0.3

Cut-off for open pit g/t 0.3 0.3

Cut-off for

underground g/t 0.3 – 3.7 0.3 – 4.0

Mineral Reserve

parameters UnitsDec

2012

Dec2011

Gold price

US$/oz 1,500 1,300

US$/A$ 1.00 1.07

A$/oz 1,500 1,400

Cut-off for mill feed

underground g/t 3.1 – 4.4 3.1 – 4.4

Cut-off for mill feed

open pit g/t 0.4 0.4

Mining recovery

factor (underground) % 107 100

Mining recovery

factor (open pit) % 100 100

MCF % 100 100

Dilution (open pit) % 15 15

Dilution (underground) % 26 26

Plant recovery factor % 94.5 94.5

Processing capacity Mtpa 1.3 1.3

Mine planning


Mineral ReservesThe Mineral Reserve estimate for Agnew is based on an appropriately detailed and engineered LoM plan. All design and scheduling

work is undertaken to an appropriate level of detail by experienced engineers using appropriate mine planning software. The

planning process incorporates appropriate modifying factors and the use of cut-off grades and other techno-economic

investigations.

The table in this section summarises the Agnew statement of Mineral Reserves. The terms and definitions are those given in

the 2007 SAMREC Code prepared by the South African Mineral Resource Committee under the auspices of the South African

Institute of Mining and Metallurgy. The current Operational Plan has mining occurring in the Kim South and Main Lode at the

Waroonga Complex.

The Mineral Reserves are derived following the generation of the LoM plan, supported by a detailed design and schedule, and

incorporating appropriate modifying factors.

Mineral Reserve classification

Classification

Tonnes (Mt) Grade (g/t) Gold (koz)

Dec

2012

Dec 2011

Dec 2010

Dec

2012

Dec 2011

Dec 2010

Dec

2012

Dec 2011

Dec 2010

Open pit and underground

Proved 0.9 1.4 1.3 6.16 5.49 4.84 177 239 195

Probable 4.9 5.4 5.6 6.12 5.98 6.25 966 1,046 1,126

Total open pit and underground 5.8 6.8 6.9 6.12 5.88 5.99 1,143 1,285 1,321

Surface stockpiles

Proved 0.2 0.3 – 1.54 1.69 – 11 17 –

Total surface stockpiles 0.2 0.3 – 1.54 1.69 – 11 17 –

Grand total 6.0 7.1 6.9 5.96 5.70 5.99 1,154 1,302 1,321

Mineral Reserves classification per mining area

Area

Proved Probable Total Mineral Reserve

Tonnes

(kt)

Grade

(g/t)

Gold

(koz)

Tonnes

(kt)

Grade

(g/t)

Gold

(koz)

Tonnes

(kt)

Grade

(g/t)

Gold

(koz)

Underground

Waroonga – Kim Lode 261 12.51 105 2,600 7.58 634 2,862 8.03 740

Waroonga – Main Lode 633 3.54 72 2,310 4.47 332 2,943 4.27 404

Total underground 894 6.16 177 4,911 6.12 966 5,804 6.12 1,143

Surface

Surface stockpiles 222 1.54 11 – – – 222 1.54 11

Total surface 222 1.54 11 – – – 222 1.54 11

Grand total 1,116 5.24 188 4,911 6.12 966 6,027 5.96 1,154

Portal to access the Waroonga underground complex


10. Competent Persons

Competent Persons

Peter Johansen: Mineral Resource Manager

BSc (Hons) Geology. AusIMM membership number 108674. Mr Johansen is the lead Competent Person in terms of

SAMREC and has 24 years’ experience in exploration and mining in Australia and PNG, six of which have been spent at

Agnew. His experience covers gold and iron ore.

Alan Pedersen: Resource Modelling Manager

Graduate Certificate in Geostatistics. MAusIMM membership number 222422. Mr Pedersen has 30 years’ experience in

mining and exploration in Australia, PNG and Ghana, related to gold, nickel and copper. 15 of these have been spent

at Agnew.

Jason Sander: Principal Mining Engineer

BEng (Hons) Mining Engineering. MAusIMM membership number 111818. Of Mr Sander’s 17 years of mining industry

experience, seven have been spent at Agnew. He is experienced in gold, copper and iron ore.

Internal technical reviews have been conducted by the Competent Persons as listed, who

are full-time employees of Gold Fields Limited.

Factors that affected Mineral Resource reconciliation

�� Depletion by mining occurred in the Kim, Main, Rajah

and Songvang ore bodies

�� An increase in the Mineral Resource gold price from

A$1,550 to A$1,650

�� Removal of the Vivien Mineral Resource ounces due to

the potential sale of the project (at the time of going to

print the official transaction had not taken place)

Go

ld (M

oz)

0.163.50

0.00

0.090.170.09

3.84

Change in Mineral ResourcesDecember 2011 to December 2012

Reso

urc

e

mo

delling

Dis

co

very

Decem

ber

20

11

Min

ed

dep

letio

n

Eco

no

mic

fa

cto

rs

Oth

er

Decem

ber

20

12

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

Mineral Reserve sensitivityTo illustrate the impact of fluctuations in gold price and

exchange rates on the current declaration, Agnew has

generated sensitivities with respect to Mineral Reserves.

The following graph indicates the managed Mineral Reserve

Sensitivity at -10%, -5%, base, +5%, +10% and +25% to

the gold price.

These sensitivities (other than for the base case) are not

supported by detailed plans and depletion schedules. They

should only be considered on an indicative basis; specifically

as such sensitivities assume 100% selectivity, without any

operating cost increases.

Mineral Resources and Mineral Reserves reconciliation year-on-yearFactors that affected Mineral Reserve reconciliation

�� Depletion by mining that occurred in the Kim, Main,

Rajah and Songvang ore bodies (-182 koz)

�� Removal of the Rajah lode mineral from Mineral Reserve

�� The use of the Mineable Stope Optimiser software

(MSO) resulted in an increase that included lower-grade

“halo” material into the Mineral Reserves

Go

ld (M

oz)

0.00 0.00 1.15

0.04

0.070.01

0.18

1.30

Change in Mineral ReservesDecember 2011 to December 2012

Dis

co

very

Decem

ber

20

11

Min

ed

dep

letio

n

Reso

urc

em

od

elling

Exclu

sio

ns

Eco

no

mic

s

Facto

rs

Oth

er

Decem

ber

20

12

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

Managed Mineral Reserve sensitivity

Go

ld (M

oz)

1.43

1.241.201.15

1.101.03

(-10%) (-5%) (Base)1,500

(+5%) (+10%) (+25%)

1.6

1.2

0.8

0.4

0

Gold price (A$/oz)


11. Key technical staff

Post Incumbent Qualifications Years Key responsibilities

General Manager Garry Mills B App Sci – Mining 35 Overall strategic direction,

leadership and management of the

mine site

Mining Manager

(Underground and

Open Pit Mining)

Brett Anderson BEng

(Mining Engineering)

25 Management of mining operations

Financial

Management and

Accounting

Commercial

Manager

Eric Asubonteng BSc (Administration Accounting)

ACCA

8 Financial management, reporting

and compliance

Human Resources

Manager

Sean Redmond MBA 17 Human resources management

Metallurgy and

Engineering

Manager

Alex Kraan BBA 5 Engineering, logistics and

infrastructure management.

Mineral Processing and Metallurgy

CIL and Tailings management

Mineral Resources

Manager: Mine

Planning and

Resource

Management

Peter Johansen BSc (Hons) Geology 24 Mineral Resources and Mineral

Reserves and compilation of CPR.

Sustainable development

Mechanised roof – bolting and wire meshing

Page w

idth 208 mm

Page w

idth 205 mm

Gold Fields LimitedAgnew Gold Mine

Plan showing mine infrastructure as at 31 December 20121 0 1 3 5

Kilometres

Map Grid of Australia Co-ordinate System

Agnew Mining Lease . . . . . . . . . . . . . . .

Agnew Prospecting Licence . . . . . . . . . .

Agnew Exploration Licence . . . . . . . . . .

Tailings/Leach Pad . . . . . . . . . . . . . . . . .

Open Pit . . . . . . . . . . . . . . . . . . . . . . . . .

Waste Dump . . . . . . . . . . . . . . . . . . . . . .

Roads . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reference

12. Brief history

The history of Agnew

1895: Gold discovered at Lawlers 10 kilometres south of Agnew Township.

1895 – 1912: The Waroonga mine developed, tramming ore 10 kilometres to the existing Great Eastern mine.

Closed due to poor performance.

1934: East Murchison United Limited (EMU) purchased Waroonga lease and constructed a treatment plant

in 1936.

1937 – 1948: The Waroonga mine now known as Emu is operated until closure due to high groundwater inflows and

“company problems”.

1948 – 1975: Despite further exploration by the Kim syndicate, WA Mines department and Western Mining

Corporation (WMC), including the sinking of a 63-metre shaft, funds to develop the ore bodies could

not be raised.

1976: WMC exercised an option to purchase the Emu mine after intersecting mineralisation below the

old workings.

1984: Percussion and diamond drilling undertaken by WMC to test open pit potential of the area. This was

followed by test pitting in 1985 and full scale open pit mining from 1986.

1985: WMC enters a joint venture with Nord Australex (Proprietary) Limited to explore for Emu style

mineralisation leading to the discovery of the Redeemer and Deliverer ore bodies.

1987: The Cox-Crusader ore body discovered 400 metres south of the Deliverer ore body by Asarco

Australia Limited (Asarco).

1989: Exploratory underground development undertaken at Emu from which production was maintained.

1990: Underground operations commenced at Redeemer.

1992: All operations around Emu ceased and Emu mine allowed to flood. WMC purchases Cox leases from

Asarco as ore body extends into WMC tenements to north and Cox pit extended.

1994: Cox pit mined out and a decline developed on the Crusader ore body.

2001: New phase of drilling undertaken in Emu area leading to recommencement of open pit operations and

renaming from Emu to Waroonga.

Gold Fields Australia acquired the operations from WMC and formed Agnew Gold Mining Company.

2002: Decline developed to access the Kim and Main Lodes. Redeemer underground mine closed.

2005: Ore production from Songvang commenced. Ore development and trial stoping undertaken in Main

Lode. 100% of the gold rights to the Miranda and Vivien joint venture leases obtained.

2006 – 2010: Exploration of the Claudius and Vivien complexes continues. Drilling at Waroonga continues to extend

the known limits of the Kim and Main ore bodies.

2011: Ore production from Songvang cutback commenced. High-grade shoots – Fitzroy, Bengal and

Hastings discovered beneath Main Lode.

2012: Ore production from Songvang northern pit cut-back completed.

Down-scale mining from Main Lode.


Agnew Mineral Resource and Mineral Reserve classification

Mine model of Agnew Waroonga ore body

EXPLORATIONRESULTS

MINERALRESERVES

MINERALRESOURCES

Reported as in situmineralisation estimates

Consideration of mining, metallurgical, economic, marketing, legal,environmental, social and governmental factors (the “modifying factors”)

23.2 Mt @ 4.70 g/t3.5 Moz

6.0 Mt @ 5.96 g/t1.2 Moz

4.9 Mt @ 6.12 g/t1.0 Moz

1.1 Mt @ 5.24 g/t0.2 Moz

7.1 Mt @ 4.53 g/t1.0 Moz

12.0 Mt @ 4.86 g/t1.9 Moz

4.1 Mt @ 4.54 g/t0.6 Moz

Reported as mineableproduction estimates

Incr

easi

ng le

vel o

f geo

scie

ntifi

c kn

owle

dge

and

confi

denc

e

MEASURED PROVED

PROBABLEINDICATED

INFERRED

1,400 mbs

Waroonga Pit

Main NorthMain South

Kim Lode

Reserve Stopes Completed Stopes

Hastings Shoot

Bengal Shoot

Fitzroy Shoot

Rajah Lode


BASTION GRAPHICS

This Technical Short Form Report (the Report) contains information as at 31 December 2012 (the Effective Date of this

Report). The statements and information set out in this Report speak only as of the Effective Date of this Report. Shareholders

and other interested and affected parties are therefore urged to review all public disclosures made by Gold Fields after the

Effective Date of this Report, as some of the information contained in the Report may have changed or been updated. Gold

Fields does not undertake any obligation to update publicly or release any revisions to statements and information set out in this

Report to reflect events or circumstances after the Effective Date of this Report, or to reflect the occurrence of unanticipated

events, unless obliged to do so pursuant to law or regulation. In such event, Gold Fields does not undertake to refer back to

any information contained in this Report.

Notes

Drilling in an ore drive

Registered Office South Africa:

150 Helen RoadSandownSandton, 2196JohannesburgGauteng

Private Bag X30500Houghton, 2041South Africa

Website: http://www.goldfields.co.zaTelephone: +27 (0) 11 562 9700Facsimile: +27 (0) 11 562 9838

“If we cannot mine safely, we will not mine”

Gold Fields Safety Value

Documents

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