Agnew Gold Mine · 2018-10-11 · Gold Fields – Agnew Gold Mine – Technical Short Form Report...
Transcript of Agnew Gold Mine · 2018-10-11 · Gold Fields – Agnew Gold Mine – Technical Short Form Report...
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
3Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012 �
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 � Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012
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
5Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012 �
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
6 � Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012
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
7Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012 �
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
8 � Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012
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.
9Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012 �
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.
10 � Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012
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
11Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012 �
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
12 � Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012
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
13Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012 �
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)
14 � Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012
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.
17 � Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012
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
18 � Gold Fields – Agnew Gold Mine – Technical Short Form Report 2012
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