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Damang Gold MineTechnical Short Form Report31 December 2012
1. OverviewDamang Gold Mine is owned and operated by Abosso Goldfields
Limited (AGL), a Ghanaian-registered company. With Gold Fields’
acquisition of IAMGold’s indirect 18.9% stake in the Damang Gold
Mine in June 2011 Gold Fields now owns 90% of the issued
shares of AGL, with the Ghanaian government owning the
remaining 10% free carried interest. The Damang Gold Mine
consists of two mining leases, namely the Damang mining lease
and the Lima South mining lease (8,111 hectares), and has
four prospecting licences that cover a combined total area
of 25,454 hectares.
The Damang Gold Mine is located in south-western Ghana near
the southern end of what is commonly referred to as the Tarkwa
Basin, 300 kilometres by road west of Accra, the capital of
Ghana. The mine exploits oxide and fresh hydrothermal
mineralisation in addition to Witwatersrand-style palaeoplacer
gold. The hydrothermal mineralisation is located in Tarkwaian
sediments and is the only deposit of its kind located on the
eastern side of the Ashanti Belt in south west Ghana. Damang’s
main ore body is located close to the closure of an antiform, while
all other known palaeoplacer mineralisation is located on the
eastern and western limbs of the anticline.
The Damang plant currently processes ~ 4.7 Mtpa from a blend
of approximately 5% oxide ore and 95% fresh ore but going
forward it is planned to treat 100% fresh ore. The ore is sourced
from various open pit mining operations and existing surface
stockpiles. Process feed for the 12-month period to 31 December
2012 comprised 4.4 Mt, at a yield of 1.17 g/t for 166 koz.
This Technical Short Form Report reflects the latest Life of Mine
(LoM) plan input parameters, together with an updated Mineral
Resource and Mineral Reserve statement. The declared Mineral
Reserve as at 31 December 2012 has increased by 641 koz of
gold when reconciled against the December 2011 statement,
predominantly due to the increased pit-shell size at Greater
Damang.
All Mineral Resource and Mineral Reserve figures reported
are managed unless otherwise stated. Mineral Resources are
inclusive of Mineral Reserves.
Geographic locationDamang locality plan with mining leases magnified
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1Gold Fields – Damang 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 8
8. Sustainable development Page 9
9. Mineral Resources and Mineral
Reserves Page 10
10. Competent Persons Page 14
11. Key technical staff Page 14
12. Brief history Page 17
Cover image:Open pit mining operations at Damang Gold Mine, Ghana
Note: For abbreviations refer to page 27 and for glossary of
terms refer to page 28 – “Mineral Resources and Mineral
Reserves Overview 2012”.
��Aerial view of sustainable rehabilitation programme at Damang
Contents
destination and host to world-class
ld d osits. The Daman Gold
and contribute to Gold Fields’ vision:
.
WWest Africa is a premier mining West Africa is a premier mining
destination and host to world-classdestination and host to world-classdestination and host to world-class
gold d osits. The Damang Gold gold deposits. The Damang Gold gold deposits. The Damang Gold
Mine in particular will leverage this Mine in particular will leverage this Mine in particular will leverage this
and contribute to Gold Fields’ vision:and contribute to Gold Fields’ vision:
“To be the lobal leader in “To be the global leader in “To be the global leader in
sustainable gold miningsustainable gold mining...”””
2 � Gold Fields – Damang 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 Damang 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. Damang 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 Damang is located in south-western Ghana, approximately 300 kilometres by road west of Accra, the capital, at latitude 5° 11’ N and longitude 1° 57’ W. The Damang concession lies to the north of and joins the Tarkwa concession, which is located near the town of Tarkwa. The area is served with good access roads with established infrastructure, and a main road connects the Mine to the port of Takoradi, some 90 kilometres to the south-east
Climate A tropical climate, with average monthly temperatures between 21°C and 32°C, is characterised by two distinct rainy seasons from March to July and September to November. Average annual rainfall near the site is 2,030 millimetres. Although there may be minor disruptions to operations during the wet season, there is no operating or long-term constraint on production due to climate
Licence status and holdings
The Damang concession covers a total area of 25,454 hectares. All necessary statutory mining authorisations and permits are in place for the Damang Mine Lease, and Abosso Goldfields is entitled to mine all material falling within the lease. Abosso Goldfields holds a mining lease in respect of the Damang Mine dated 19 April 1995, as amended by an agreement dated 4 April 1996. This lease expires in 2025, but is renewable under its terms and the provisions of the Minerals and Mining Law, by agreement between Abosso Goldfields and the Government of Ghana
Operational infrastructure
The Damang plant processes oxide and fresh ore, which is sourced from four open pit mining operations and existing surface stockpiles, located on the Damang Mine Lease. The current plant name-plate throughput is 5.1 Mtpa, with an approximate ore blend of 60:40 fresh:oxide
Deposit type The Damang ore body is hosted by a north to northwesterly plunging antiform, developed within Tarkwaian sediments. The main Damang pit is located close to the closure of the antiform, and all other known mineralisation is located on the east and west limbs of the Damang anticline. The mine exploits oxide and fresh hydrothermal mineralisation in addition to Witwatersrand-style, palaeoplacer mineralisation
Life of Mine (LoM) It is estimated that the current Mineral Reserve will be depleted in 2028 (16 years)
Environmental/Health and Safety
Damang retained its OHSAS 18001:2007E (Safety Management system) certificate following the re-certification audit conducted in June 2012. Damang is ISO 14001-compliant and holds regulatory Certificates for Environmental Compliance. Permits have also been issued for new infrastructure at the Huni Waste Dump and Far East Tailings Storage Facility
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
Aerial view of the Damang Pit Visible gold in a rock specimen from the Damang Pit
Open pit mining operation – dump truck
Run of mine stockpile, Damang Gold Mine
3Gold Fields – Damang Gold Mine – Technical Short Form Report 2012 �
3. Operating statistics
Historic
performance UnitsDec
2012
Dec2011
Dec20101
June2010
June2009
Open pit mining
Total mined kt 33,502 23,515 7,144 12,529 19,460
– Waste mined kt 29,192 18,735 4,962 8,658 15,058
– Ore mined kt 4,310 4,780 2,182 3,867 4,402
Mined grade g/t 1.53 1.76 1.88 1.6 1.6
Strip ratio (tonnes) waste:ore 6.8 3.9 2.3 2.2 3.4
Processing
Mill tonnes kt 4,416 4,942 2,491 5,028 4,991
Mill head grade g/t 1.29 1.49 1.57 1.38 1.34
Yield g/t 1.17 1.37 1.46 1.28 1.25
Plant recovery factor % 90.2 92.0 93.3 92.9 93.1
Gold produced
Total gold productionkoz 166 218 117 207 200
kg 5,174 6,772 3,637 6,451 6,233
Gold sold koz 166 218 117 207 200
Financials
Operating cost US$/oz 946 651 632 630 661
Total cash cost US$/oz 918 701 636 660 661
Capital expenditure US$ million 114.42 87.82 56.3 29.8 16.48
Notional cash expenditure (NCE) US$/oz 1,630 1,056 1,114 774 743
General
Total Employees Costed (TEC) number 1,656 1,588 1,423 1,478 1,649
Mineral Reserves Mt 76.1 61.7 40.5 41.9 36.1
Mineral Reserves Head Grade g/t 1.67 1.71 1.60 1.58 1.60
Mineral Reserves Moz 4.1 3.4 2.1 2.1 1.8
Expected Life of Mine years 16 13 9 9 9
1 Figures shown represent the six months to 31 December 2010.2Excluding Greater Damang capital drilling.
Rounding off of figures presented in this report may result in minor computational discrepancies. Where this occurs it is not deemed significant.
Night shift open pit mining operations at Damang
4 � Gold Fields – Damang Gold Mine – Technical Short Form Report 2012
4. Geological setting and mineralisation
The Damang ore bodies are located within the Tarkwaian
sediments, which form a significant portion of the stratigraphy
of the Ashanti Belt in southwest Ghana. The Ashanti Belt is a
north-easterly striking, broadly synclinal structure made up of
Lower Proterozoic sediments and volcanics, underlaid by the
metavolcanics and metasediments of the Birimian system.
The Tarkwaian unconformably overlies the Birimian, and is
characterised by lower intensity metamorphism and the
predominance of coarse-grained, immature sedimentary units.
The Damang Gold Mine exploits oxide and fresh hydrothermal
mineralisation in addition to palaeoplacer mineralisation. The
hydrothermal mineralisation is located in Tarkwaian sediments
and is the only deposit of its kind located on the eastern side
of the Ashanti Belt in south-west Ghana.
Local geologyThe Damang ore body is hosted by a north-easterly plunging
antiform, developed within Tarkwaian sediments. The main
Damang pit is located close to the closure of the antiform,
and all other known palaeoplacer mineralisation is located on
the east and west limbs of the Damang anticline.
The stratigraphy at Damang is primarily within the Tarkwaian
Group and comprises a large-scale fining upwards sequence
of clastic sediments, interrupted by up to four major gold-
bearing quartz-pebble conglomerate horizons. This sequence
unconformably overlies a mixed Birimian Supergroup
The Damang tenement boasts a strong pipeline of exploration targets, from conceptual level to advanced projects.
Geology of south western Ghana
basement, comprising volcaniclastic deposits, minor fine-
grained clastic sediments and black shales.
The area is intruded by a number of igneous intrusions, the
most common being dolerites that occur as narrow dykes
and sill-like bodies along contacts on either side of the
Tarkwa phyllite, a particularly fine-grained pelitic unit in the
upper Tarkwaian. Another intrusive body, the so-called diorite
porphyry, occurs sporadically along the boundary between
the Birimian and the Tarkwaian.
Palaeoplacer mineralisationThere are three gold-bearing conglomerate horizons
recognised on the western limb of the Damang anticline.
From footwall to hangingwall, these are known as the Star/
Composite, Malta/Breccia and Gulder Reefs. There are also
three gold-bearing conglomerate horizons recognised on the
eastern limb, namely the Lima, Kwesie-K1 and Kwesie-K2
Reefs. These conglomerate horizons are separated by
poorly-mineralised sandstone units.
The reefs are usually characterised by a fining upwards
sequence of poorly to moderately sorted, clast-supported
polymictic conglomerates. However, local variations are
observed where the conglomerate domain is interbedded
with fine to coarse grained, poorly sorted sandstones. The
Star/Composite, Malta/Breccia and Gulder Reefs on the west
limb and the Lima, Kwesie-K1 and Kwesie-K2 Reefs on the
east limb of the Damang anticline contain higher gold grades
than the poorly mineralised sandstone units, which separate
the reefs. The conglomerate reefs may contain between
1.3 and 1.5 g/t gold, and the poorly mineralised sandstone
units usually contain between 0.1 and 0.2 g/t gold.
Hydrothermal mineralisationHydrothermal gold mineralisation at Damang occurs in pyrite
and pyrrhotite alteration selvages, which are usually less than
Local geology for Damang lease area
Takoradi
ACCRA
5Gold Fields – Damang Gold Mine – Technical Short Form Report 2012 �
Resource models, which are generated following the
completion of this drilling, are used to establish more robust
production schedules and enable more accurate and
confident grade and tonnage reconciliation.
Damang maintains rigorous quality assurance and quality
control (QA/QC) protocols on all of its exploration
programmes, using leading industry practice in data
acquisition, reputable laboratories for analytical data, and
ensuring sign-off by Competent Persons under the 2007
SAMREC Code. QA/QC programmes are the same for
samples from both hydrothermal and palaeoplacer deposits
and are intended to monitor routine sampling and laboratory
performance to control and eliminate possible errors in
sample preparation and analysis. The results of laboratory
internal QA/QC assays provide secondary validation to
accompany the AGL quality control programme.
Exploration drilling outside the current pit designs has been
curtailed for 2013, as the focus shifts to advanced grade
control and resource infill drilling to increase the confidence and
predictability in the Damang ore-body over the next two years.
Profiles depicting stratigraphic variance across property
one metre wide and located immediately adjacent to
en-echelon quartz veins. Gold is also associated with
accessory vein minerals such as carbonate, muscovite,
tourmaline, ilmenite and apatite. These alteration zones are
often linked and may result in significant volumes,
characterised by intense veining and gold mineralisation.
Damang is unique in Ghana by virtue of hydrothermal
mineralisation hosted in the quartzites of the Tarkwaian
banket footwall, instead of the metavolcanics and
metasediments of the Birimian Basement as seen at Prestea,
Bogoso and Obuasi. To date no significant hydrothermal
mineralisation has been encountered in the Birimian
lithologies at Damang.
Exploration and resource definition drillingExploration drill programmes are designed to assess the
magnitude and style of mineralisation. Reverse Circulation
(RC) drilling, using a 100 x 100 metre grid, is usually
employed for initial exploration drill-testing of both
palaeoplacer and hydrothermal styles of mineralisation. While
more costly, diamond drilling is minimised in the initial
exploration stages, it is used to establish stratigraphic and
structural relationships and allow samples to be collected for
metallurgical test work.
Exploration drilling is also done outside optimised pit shells to
assess the magnitude, grade distribution and continuity,
geotechnical engineering parameters and the metallurgical
character of the mineralisation. Follow-up drilling is
conducted depending on the results of the initial drilling.
Exploration objectives are specified in the operation’s
business plan and Mineral Reserve replacement strategy. Infill
and Mineral Resource conversion drilling, increases the level
of confidence in a resource estimate by more accurately
defining mineralisation boundaries, grade continuity and
distribution, as well as internal waste boundaries. Mineral
Exploration drilling and expenditure
31 December 2012 31 December 2011
Operation
Metres
drilled
US$
(million)
Metresdrilled
US$(million)
Damang Gold Mine 55,353 11.895 78,908 15.452
Exclusive of grade control drilling except where it is included in the capital budget.
A3, A1
AFc
WESTERN LIMB EASTERN LIMB
Me
tre
s
Breccia
Composite
G
CDE
Gulder
Malta
Star
K 2
K 1
Lima
Horizontal not to scale
0
10
20
30
40
50
60
70
TARKWAABOSSO
DEEPS
CHIDA
SOUTH
CHIDA
CENTRALCHIDA
TOMENTO
EAST
TOMENTO
NORTH
LIMA /
KWESIE
LIMA
SOUTH
BONSA
NORTH
BONSA
SOUTH
Resource definition drilling at Greater Amoanda Project
6 � Gold Fields – Damang Gold Mine – Technical Short Form Report 2012
Mining at Damang is carried out by conventional open pit
methods and has been based on an owner-operator model
since March 2011. Load and haul is undertaken using a
standard truck-shovel operation, with excavators in backhoe
configuration (one Bucyrus RH120E, three Bucyrus RH90Cs
and two Liebherr 984s). The haulage fleet consists of
26 Caterpillar 777F dump trucks, each with an average
payload capacity of 100 tonnes. The current equipment
fleet has a primary excavation rate of approximately 800 to
1,000 kBCM per month. Off-highway trucks haul ore to the
Run of Mine (RoM) pad and waste dumps. A fleet of tipper
trucks, operated by Engineers and Planners Limited, reclaims
stockpiled ore and transports it to the treatment plant.
Mining methods
Consistent with the current production schedule, mining is
carried out seven days per week, three shifts per day. The
morning, day and night shifts each last for nine-and-a-half
hours, with overlaps between the shifts.
Ancillary equipment includes bulldozers, graders, water
trucks and service truck vehicles which support the drill-and-
blast and haulage operations with vehicle, road and bench
maintenance plus dust and erosion control.
Fresh rock and transitional zones were traditionally drilled and
blasted in six-metre lifts, with excavation in three-metre
flitches. However, nine-metre and twelve-metre hole drilling
and blasting are now used as they optimise equipment use
and explosive consumption. Conventional (Nonel) detonators
are used in both fresh and oxide material. Oxide material,
which cannot be “free-dug”, is blasted using lower powder
factors. Waste material is hauled to planned dumps that are
located close to the pit exit.
AGL has a progressive reclamation plan in which inactive
areas are immediately rehabilitated through contouring and
replacement of topsoil, seeding, planting and fertilisation.
Damang Pit
Oxide ore is selectively mined to provide incremental feed to
the mill. The Rex pit, which is located 15 kilometres to the
south of the treatment plant and previously supplied oxide
ore, has been replaced by the Huni pit, located one kilometre
from the treatment plant. The haul roads are designed for
CAT 777F trucks. For double lane traffic their minimum width
is 23 metres and includes a drainage ditch with safety berm.
For single-lane traffic, a minimum width of 15 metres is used.
Mine planning and scheduling
The Mineral Resource, based on the Composite IK resource
modeling technique, forms the basis for subsequent design,
planning and extraction scheduling, incorporated into the
LoM plan. In the majority of instances, this is completed using
a combination of commercial software packages.
A detailed (one-year) operating and capital cost budget is
produced for all operational plans and, where appropriate,
extended for the LoM production schedule. The operational
plan is scheduled on a monthly basis, using zero-based
costing. Of critical importance is the utilisation of historically
achieved data for productivity and operating costs. All capital
projects are ranked and prioritised to maximise capital
efficiency and return on investment.
Optimisation software uses economic parameters and
physical constraints to generate a series of nested pits for
open pit planning. An optimal shell is then selected from this
series and detailed design confirms the mineability of the
optimised shell. The process is repeated until an acceptable
level of correlation is achieved between the optimised shell
and detailed design. Pit design is crucial for keeping strip
ratios in line with optimisation results, particularly given the
relatively small dimension of the pits, the characteristics of
the ore bodies and the size of the equipment.
Standard mine planning and design software used include:
�� Whittle 4X to derive the optimal economic pit shell;
�� Datamine® and/or MineSight® for the detailed
engineering and design work on the optimised pit shells;
�� Talpac® for haulage studies to determine cycle times and
fleet requirement; and
�� Xpac® for scheduling.
Mine planning is based on three-dimensional block models of
in situ mineralisation. Allowances are made for minimum
mining widths, dilution and ore loss appropriate to the mining
method under consideration. Historical performance
measures are used to determine these modifying factors.
Infrastructure, waste disposal and ore stockpile management
requirements are incorporated into the planning process.
5. Mining
The Damang plant processes oxide and fresh ore, which is sourced from three open pits and
existing surface stockpiles, located on the Damang Mine lease.
7Gold Fields – Damang Gold Mine – Technical Short Form Report 2012 n
6. Projects
Re-interpretation of the entire tenement holding has highlighted a number of conceptually prospective target areas; however, the Greater Damang Extension Programme will be the key focus.
Two parallel exploration programmes are currently running at Damang. The primary project is the Greater Damang Extension programme and is jointly administrated and executed by Abosso Goldfields Limited and the Growth and International Projects group. The other exploration programme falls under the near mine exploration team which has five key projects:
Greater Damang Programme■■ Greater Damang Project – this comprises work in and
around the Damang pit as well as on the extensions to the Damang Cutback (Huni North, Juno, Tamang and Kwesi). The focus is on identifying where potential exists for both fresh palaeoplacer and hydrothermal mineralisation, along a strike length of some 3.5 kilometres and beneath the currently modelled pit shells. The potential beneath the pit shells has been proved and resource conversion drilling continued in 2012. The Greater Damang Phase III drilling was completed during 2012 and has addressed gaps in the resource model, provided geotechnical data and facilitated mineralogical work.
Greater Damang Project
RCmetres
DDmetres
Total metres
Resource infill drilling 7,414 16,944 24,358
Geotechnical drilling 592 2,190 2,782RC – Reverse circulation.DD – Diamond drilling.
Near Mine Exploration Programme■■ The Greater Amoanda Project – this focuses on the
1.5-kilometre-long corridor between the Amoanda and Tomento East pits. Its aim is to add to the 211 koz Mineral Reserves which are delineated in the 400 metres immediately north of the Amoanda pit, towards the Tomento East pit. During 2012, the drill spacing in the corridor area was reduced to a 40 x 40 metre pattern to allow resource estimation to be carried out. The infill drilling added 63,679 gold ounces at US$50/oz.
Greater Amoanda Project
RCmetres
DDmetres
Total metres
Resource infill drilling 5,426 12,116 17,542
Geotechnical drilling 615 2,192 2,807
■■ The Greater Rex Project – drilling of resource in-fill holes was put on hold due to the importance of the Greater Damang Project.
■■ The Bonsa Hydrothermal Project – earlier exploration on the Bonsa River Forest Reserve Prospecting License (PL) concentrated on paleoplacer mineralisation in the northern portion of the PL, with only limited exploration undertaken
in the southern portion, where the Bonsa Hydrothermal Project is located. A recent project review identified the Bonsa Hydrothermal Project as one of the best ranked targets on the AGL PL’s. The target area is structurally complex and underlain by the banket footwall quartzite, which favours the development of hydrothermal ore bodies. During 2012, 15 diamond drill holes were drilled to test various structural contacts on the project for gold mineralisation. Assay results are outstanding.
Bonsa Hydrothermal
RCmetres
DDmetres
Total metres
Greenfields exploration 0 2,520 2,520
■■ Sterilisation drilling of the proposed new plant site was completed in July 2012 and 31% of the Huni Waste Rock Dump sterilisation holes have been completed.
Sterilisation DrillingRC
metresDD
metresTotal
metres
Proposed Plant Site sterilisation 2,250 0 2,250
Huni Waste Dump sterilisation 3,060 0 3,060
■■ The Subiri, Wassa Breman and Epieso PL’s were renewed in May 2012.
Resource definition drilling – Bonsa Hydrothermal Project
8 � Gold Fields – Damang Gold Mine – Technical Short Form Report 2012
7. Mineral processing
The Damang milling circuit was commissioned in November
1997 with a design throughput of 3.0 Mtpa. A number of
modifications and optimisations are planned to increase the
annual throughput to about 5.1 Mtpa with a 100% fresh ore
feed. The current annual throughput is 4.7 Mtpa; but it is
expected to decrease to 4.6 Mtpa in the short term due to
the feed blend changing to 100% fresh, pending the
modifications.
An anticipated change to the ore blend from the pit (oxide
decreasing to zero and 100% fresh ore) started to impact the
ability of the plant to maintain the throughput. The plant is a
conventional two-stage grinding circuit using SAG and ball
mill combination, with pebble crusher, gravity concentration
and an inline leach reactor, followed by a carbon-in-leach
recovery process. The average throughput of the plant is
currently 13,238 tons per day (tpd), with an overall plant
utilisation of 92%.
The purpose of the milling section is to produce blended
leach feed with about 80% passing 125 μm. The section
consists of a SAG mill (8 metres x 5.1 metres) with a power
rating of 5.8 MW and a ball mill (6.1 metres x 9 metres) with
an identical power rating. Cyanide is added to the feed to the
CIL at the trash screen under pan to maximise the gold
dissolution.
Gravity gold is collected and treated by the Knelson
concentrators followed by an intensive cyanidation using the
ILR3000BA. The In-line Leach Reactor (ILR) was
commissioned in December 2012.
A scalped stream of approximately a fifth of the cyclone
underflow stream (circulating load) is fed to the gravity circuit
which comprises 2x KC 48 Knelson gravity concentrators
with a capacity of 200 to 400 tph. The balance of the
circulating load reports to the ball mill as feed. The purpose of
this section is to remove any free gold out of the circuit. The
section consists of two vibratory screens, which are fitted
with five-millimetre aperture screen panels to the two Knelson
concentrators. The feed is introduced to the screen with the
oversize reporting back to the ball mill and the undersize
material is presented to the Knelson concentrators. The tails
from the Knelson concentrators combine with the ball mill
discharge and are presented as a feed to the cyclones. The
concentrate reports to the ILR, which leaches the gold under
pressure and high cyanide concentrations to yield dissolved
gold; which in turn is recovered by electro winning in the
gold room.
Cyclone overflow is screened to remove trash before
reporting to the seven-stage CIL, via the filblast pump, which
is fitted with a multimix head for oxygen injection. The cyclone
overflow comprises 45% solids and is introduced onto the
trash screen (0.8 millimetre apertures) and the undersize is
presented as leach feed. At this stage about 30% of the gold
is dissolved.
Gaseous oxygen and hydrogen peroxide are dosed to CIL
tanks 1 and 2, to maintain dissolved oxygen content of
14 ppm and 10 ppm for the first two tanks respectively.
The slurry discharging from the last tank is screened on a
horizontal linear screen (tailings screen) which is fitted with a
screen cloth of 0.8 millimetre aperture. This screen recovers
and returns to the CIL circuit any coarse carbon discharged
accidentally.
Loaded carbon is recovered from the first tank of the
adsorption train and transferred to acid washing, elution, and
electro winning. Cathodes are washed with high-pressure
spray water and the gold sludge is recovered by filtration.
The gold sludge filter cake is dried and smelted. Slurry
discharging from the last adsorption tank is screened ahead
of thickening and tailings disposal.
The plant throughput is expected to increase to 5.1 Mtpa in
2015. This is driven by current capital projects including a
secondary crusher upgrade to reduce the F80 into the milling
circuit from 44 mm to 28.5 mm. The intermediate plan to
maintain throughput is the use of a mobile crusher to
produce more fines for feeding the SAG mill.
The LoM tailings deposition is based on placement of
5.1 Mtpa. The installed capacity in 2013 reflects the active
ETSF. The new FETSF is built during 2013 and will be
commissioned in 2014 and adds a total capacity of 50.4Mt
up to 2022. TSF 4 then provides in excess of the LoM in
2023. During 2014 and 2015 a portion of the ETSF (4.5Mt) is
to be re-mined to allow for the Damang pit cut-back, and the
special capital requirement associated with this activity is
included in the table.
Modifications and optimisations are planned to increase the Plant throughput from 4.7 Mtpa
to about 5.1 Mtpa with a 100% fresh ore feed.
Damang LoM tailings storage facility assessment
Damang TSF
LoM deposition
(Mt)
Total installed
capacity (Mt)
Surplus/
(shortfall) (Mt)
Capital
requirements
(US$ million)
2013 – ETSF 64.8 70.4 5.6 –
2014 – FETSF Phase 1 69.9 87.8 17.9 37.6
2015 – Mining DPCB2 ETSF Portion – – – 4.0
2022 – FETSF Complete 110.7 120.8 10.12 39.6
2023 – TSF 4 Complete 115.8 144.8 29.02 39.6
9Gold Fields – Damang Gold Mine – Technical Short Form Report 2012 �
8. Sustainable development
Damang’s vision is strongly aligned with the Gold Fields vision of
being the global leader in sustainable gold mining. The mine has
achieved an outstanding health and safety performance record
through the participation of all employees and the application of
safe, innovative processes and technologies, within a framework
of full compliance. It was recognised as the safest operating
mine in Ghana in 2004, achieved the Chairman’s safety shield in
2008, and was named as the Best Mine in Ghana in 2009
based on occupational injury statistics as defined by the Ghana
Minerals Commission. Damang has set a target of zero harm for
the next financial year. The mine’s progressive fatality-free shifts
are currently in excess of six million.
The Abosso Goldfields Limited Environmental Policy, which is
aligned with the Gold Fields Limited Environmental Policy,
underpins the ISO 14001-certified Environmental Management
System (EMS) at Damang. Certification was initially obtained in
July 2003 for a three-year period, and has since undergone
annual third-party audits. The EMS was recertified under the
revised ISO 14001:2004 standard in 2006 and 2009 for a
further three-year period, and two surveillance audits in 2010
and 2011 were completed. A further recertification audit was
successfully completed in February 2012.
During 2012 Damang continued to deliver tangible and
lasting benefits to its stakeholder communities as part of its
commitment to sustainable community development. Social
investment projects during the year focused on education,
health, water and sanitation and sustainable livelihood.
The impact of these projects on the lives of community
members is an important measurement tool for determining
success. During the year, the company commissioned a
study on the impact of its community infrastructural projects.
This was undertaken by a research team from the Kwame
Nkrumah University of Science and Technology; the study
indicated that communities had derived significant benefits
from the provision of quality infrastructure. This is reflected in
increased access to basic education, healthcare, water and
sanitation services, road transportation, and other socio-
economic facilities in the beneficiary communities.
The mine also ran an in-house study on 343 beneficiaries
involved in the oil palm project during the year. Oil palm
beneficiaries constitute 58% of the sustainable livelihood
programme beneficiaries. The study indicated that 73% of
the farms were in good condition (2011: 57%). This is largely
thanks to an awards scheme that was instituted in 2011,
which provides top-performing oil palm farmers with
weedicides, fertilisers and knapsack sprayers.
Safety statistics
Class Units Dec 2012 Dec 2011 Dec 20101 June 2010 June 2009
Fatalities number – – – – –
Fatality rate per mmhrs – – – – –
LDIFR2 per mmhrs 0.40 0.20 0.30 0.30 0.60
1 For six months to December 2010.2 Lost Day Injury Frequency Rate.
Damang complies with the Gold Fields Health and Safety Policy, which subscribes to
international leading practices, including World Bank Policies and Guidelines, International
Finance Corporation Operational Policies, International Labour Organisation Conventions and
OHSAS 18001.
Damang Community Centre opened on 1 February 2012
10 � Gold Fields – Damang Gold Mine – Technical Short Form Report 2012
9. Mineral Resources and Mineral Reserves
The Damang Mineral Resource and Mineral Reserve declarations are based on systematic and sustainable mineral reporting practices. The geological structure and reef-pod models used as the basis of each declaration are updated using systematic RC and diamond drilling with subsequent core-logging. Ongoing assaying of RC, and diamond drilling with grade control samples provides additional grade and geology data, which is incorporated into a detailed evaluation model.
Updated pit designs and schedules are compiled and evaluated based on the most recent technical and economic parameters, and used to compile a LoM plan, taking into account pit limitations, haul road distance and plant capacity. Detailed economic and scenario models underpin Mineral Reserve declarations, while internal and external audits and peer reviews ensure consistency and compliance with regulatory practices.
Mineral ResourcesMineral 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 that needs 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 9.3 12.9 4.4 1.94 1.90 1.54 584 787 218
Indicated 96.1 113.4 55.8 2.01 1.73 1.64 6,205 6,316 2,936
Inferred1 21.5 36.4 12.0 2.26 2.44 3.44 1,565 2,854 1,329
Total open pit and underground 127.0 162.7 72.2 2.05 1.90 1.93 8,355 9,957 4,483
Surface stockpiles
Indicated 2.6 2.7 4.4 0.89 1.00 1.10 74 87 155
Total surface stockpiles 2.6 2.7 4.4 0.89 1.00 1.10 74 87 155
Grand total 129.6 165.4 76.6 2.02 1.89 1.88 8,429 10,044 4,638
1December 2012 excludes the Abosso underground Inferred Mineral Resources of 5.1 Mt at 6.14 g/t.
Mineral Resource classification per mining area
Area*
Measured Indicated Inferred Total Mineral Resource
Tonnes(Mt)
Grade(g/t)
Gold(koz)
Tonnes(Mt)
Grade(g/t)
Gold(koz)
Tonnes(Mt)
Grade(g/t)
Gold(koz)
Tonnes(Mt)
Grade(g/t)
Gold(koz)
Open pit
DPCB 1 1.1 1.84 66 1.2 1.82 73 – – – 2.4 1.84 139
DPCB 2 3.0 2.10 203 29.2 2.15 2,017 10.7 2.29 790 42.9 2.18 3,010
Huni 0.9 1.79 51 8.0 1.97 507 2.0 2.07 130 10.8 1.97 688
Saddle (DPCB 2) 1.9 2.24 136 19.7 2.27 1,434 8.1 2.28 596 29.7 2.27 2,166
Juno 2.5 1.62 129 17.7 1.99 1,131 0.6 2.14 38 20.7 1.95 1,298
Amoanda – – – 4.7 2.12 323 0.1 2.26 5 4.8 2.12 328
Rex** – – – 12.7 1.53 623 – – – 12.7 1.53 623
Tomento East – – – 0.7 1.15 26 – – – 0.7 1.15 26
Tomento West** – – – – – – 0.1 1.42 5 0.1 1.42 5
Abosso Tails – – – 2.2 1.00 71 – – – 2.2 1.00 71
Total open pit 9.3 1.94 584 96.1 2.01 6,205 21.5 2.26 1,565 127.0 2.05 8,355
Stockpiles – – – 2.6 0.89 74 – – – 2.6 0.89 74
Grand total 9.3 1.94 584 98.8 1.98 6,279 21.5 2.26 1,565 129.6 2.02 8,429
* Abosso underground and satellite pits with less than 20 koz have been transferred to inventory.
** Source of oxide.
The year focused on consolidating the vision of a LoM to 2028 and beyond, based on a
post-depletion Mineral Resource of 8.4 Moz and post-depletion Mineral Reserves of 4.1 Moz.
11Gold Fields – Damang Gold Mine – Technical Short Form Report 2012 �
Modifying factors�� The Measured and Indicated Mineral Resources are
inclusive of those Mineral Resources modified to produce
Mineral Reserves;
�� Unless otherwise stated, all Mineral Resources and Mineral
Reserves are quoted as 100% and are not attributable
with respect to ownership;
�� All Mineral Reserves are quoted in terms of RoM grades
and tonnages, as delivered to the metallurgical processing
facilities, and are therefore fully diluted;
�� Mineral Reserve statements include only Measured and
Indicated Mineral Resources, modified to produce Mineral
Reserves and contained in the LoM plan; and
�� Mineral Resources and Mineral Reserves have undergone
internal and external audits during the current year, and
any issues identified were rectified during the current
reporting cycle.
Juno pit, load and haul operations
Blast hole drilling during night shift
Mineral Resource
parameters UnitsDec
2012
Dec2011
Gold price US$/oz 1,650 1,450
Cut-off for fresh ore g/t 0.65 0.55
Cut-off for oxide ore g/t 0.55 0.32
Mineral Reserve
parameters UnitsDec
2012
Dec2011
Gold price US$/oz 1,500 1,300
Cut-off for fresh ore g/t 0.71 0.62
Cut-off for oxide ore g/t 0.60 0.35
Strip ratio waste:ore 6.51 4.6
Dilution (hydrothermal) % 6 – 20 10 – 15
Dilution (palaeoplacer) cm 40 40
Mining recovery
factor % 90 – 100 90 – 100
MCF % 89 – 92 92
Plant recovery factor
– fresh ore % 92 91.5
Plant recovery factor
– oxide ore % 93.5 93.5
Processing capacity Mtpa 5.12 5.11
1 At 60% fresh and 40% oxide ore blend.2 At 100% fresh blend from 2015.
Grade tonnage curves
Open pits
To
nnes (m
illio
ns)
Avera
ge g
rad
e a
bo
ve c
ut-
off (g
/t)
0 0.40.2 0.6 0.8 1.0
Cut-off grade (g/t)
200
180
160
140
120
100
80
2.6
2.2
1.8
1.4
1.0
12 � Gold Fields – Damang Gold Mine – Technical Short Form Report 2012
Mineral ReservesThe Mineral Reserve estimate for Damang Gold Mine is based on the development of appropriately detailed and engineered LoM plans. Experienced engineers use mine-planning software to develop designs and schedules to the appropriate level of detail, incorporating modifying factors, cut-off grades and the results of other techno-economic investigations.
In general, Proved Mineral Reserves are derived from Measured Mineral Resources, and the Probable Mineral Reserves are derived from Indicated Mineral Resources, except where confidence in the modifying factors lead to Measured Mineral Resources converting to lower confidence Probable Mineral Reserves. The stockpiles included in the Mineral Reserve comprise mostly lower-grade mineralisation that has been accumulated since the start of mining of the Damang pit. The stockpile material comprises around 2.6% of the Mineral Reserve ounces and 4.4% of the Mineral Reserve tonnes.
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
Proved 8.7 8.6 2.4 1.81 2.00 1.62 509 552 125
Probable 64.8 50.4 33.7 1.68 1.70 1.66 3,507 2,751 1,800
Total open pit 73.5 59.0 36.1 1.70 1.74 1.66 4,016 3,303 1,925
Surface stockpiles
Probable 2.6 2.7 4.4 0.89 1.00 1.10 74 87 155
Total surface stockpiles 2.6 2.7 4.4 0.89 1.00 1.10 74 87 155
Grand total 76.1 61.7 40.5 1.67 1.71 1.60 4,090 3,390 2,080
Mineral Reserve classification per mining area
Area
Proved Probable Total Mineral Reserve
Tonnes(Mt)
Grade(g/t)
Gold(koz)
Tonnes(Mt)
Grade(g/t)
Gold(koz)
Tonnes(Mt)
Grade(g/t)
Gold(koz)
DPCB 1 1.056 1.71 58 1.157 1.04 39 2.213 1.36 97
DPCB 2 3.077 1.82 180 27.937 1.78 1,600 31.014 1.78 1,780
Juno 1.278 1.63 67 3.655 1.28 150 4.933 1.37 217
Huni 994 1.63 52 6.360 1.49 305 7.354 1.51 357
Saddle (DPCB 2) 2.326 2.03 152 12.468 1.93 775 14.794 1.95 927
Lima South – – – – – – – – –
Tomento East – – – 650 1.10 23 650 1.10 23
Tomento West – – – – – – – – –
Amoanda – – – 3.244 2.03 212 3.244 2.03 212
Rex – – – 7.323 1.44 339 7.323 1.44 339
Chida – – – – – – – – –
Abosso Tailings – – – 2.019 1.01 65 2.019 1.01 65
Surface stockpiles – – – 2.587 0.89 74 2.587 0.89 74
Grand total 8.731 1.81 509 67.400 1.74 3,581 76.131 1.67 4,090
Run of mine stockpile
13Gold Fields – Damang Gold Mine – Technical Short Form Report 2012 �
Resource definition drilling
Mineral Resources and Mineral Reserves reconciliation year-on-year
Factors that affected Mineral Reserve reconciliation
�� Growth largely as a result of updated resource
modelling at Greater Damang coupled with the gold
price increase; and
�� Increased pit design geometry and parameters at
DPCB 2.
Go
ld (M
oz)
0.09 0.07
1.78
0.134.09
0.270.33
0.19
3.39
Change in Mineral ReservesDecember 2011 to December 2012
MC
F
Decem
ber
20
11
Min
ed
dep
letio
n
Reso
urc
e
mo
delling
Eco
no
mic
fa
cto
rs
Sate
llite
pits
Desig
n
Oth
er
Decem
ber
20
12
5.0
4.0
3.0
2.0
1.0
0.0
Mineral Reserve sensitivityTo illustrate the impact of fluctuations in gold price and
exchange rates on the current declaration, Damang has
generated sensitivities with respect to Mineral Reserves.
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.
The following graph indicates the managed Mineral Reserve
Sensitivity at -10%, -5%, Base, +5%, +10% and +25% to the
gold price.
Managed Mineral Reserve sensitivity
Go
ld (M
oz)
4.784.454.31
4.093.953.63
(-10%) (-5%) (Base)1,500
(+5%)
Gold price (US$/oz)
(+10%) (+25%)
6
5
4
3
2
1
0
Factors that affected Mineral Resource reconciliation
�� 1.4 Moz transferred to inventory (Abosso UG and
Satellite pits with <20 koz); and
�� The gold price has impacted additional ounces at
Greater Damang but the net result has been to some
extent negated by the increased costs.
Go
ld (M
oz)
0.60
1.448.430.27 0.29
0.21
10.04
Change in Mineral ResourcesDecember 2011 to December 2012
Co
sts
Decem
ber
20
11
Min
ed
dep
letio
n
Reso
urc
e
mo
delling
Eco
no
mic
fa
cto
rs
Tra
nsfe
r to
in
vento
ry
Decem
ber
20
12
12.0
10.0
8.0
6.0
4.0
2.0
0.0
14 � Gold Fields – Damang Gold Mine – Technical Short Form Report 2012
10. Competent Persons
Competent Persons
Richard Downing: Regional Mineral Resources Manager
BSc Hons (Geology and Environment) GDE Mining Engineering, MAusIMM (No 229889). Richard has 32 years’ experience in
mining and exploration in South Africa, Ireland and Ghana and is the lead Competent Person, jointly responsible for the
overall correctness, standard and compliance of this declaration.
David Dadzie: Chief Mine Geologist
BSc Geology, Member of the Ghana Institute of Engineers. David has 13 years’ experience in mining and exploration in
Ghana and is responsible for grade control, reserve reconciliation and resource modelling.
Sean Kelly: Geostatistics and Evaluation Manager
National Higher Diploma (Mineral Resource Management), GDE (Mining Engineering), Mine Surveyor’s Certificate of
Competency, Member of PLATO (No MS0095). Sean has 30 years’ experience in the mining industry and is responsible for
the resource modelling and estimation.
Deon Steenkamp: Chief Exploration Geologist
BSc (Geology), BSc (Hons.) Economic Geology, MBA, MAusIMM (301686). Deon has 30 years’ experience in mining and
exploration in Ghana and South Africa and is responsible for exploration programme planning and implementation.
Robert van der Westhuizen: Mine Planning Engineer
MSc (Mining), MAusIMM (No 223783). Robert has 33 years’ experience in the mining industry in South Africa, Mali, Ghana
and Tanzania and is responsible for mine planning, optimisation and scheduling.
Internal technical reviews have been conducted by the Competent Persons as listed, who
are full-time employees of Gold Fields Limited.
11. Key technical staff
Post Incumbent Qualifications Years Key responsibilities
General Manager Christo Viljoen NHD (Electrical Engineering);
GCCE (Mines); GCCE (Factories)
PrEng 2008/900/24
27 Responsible for the overall strategic
direction, leadership and
management
Manager Mining Samuel Takyi BSc Mining Engineering 15 Responsible for mining operations
and scheduling
Metallurgy
Manager
Philip Stander BEng (Chemical)
MBL (Master in Business
Leadership)
28 Mineral processing and metallurgy
Environmental
Manager
Francis Nyame MSc (Environmental Management)
AIEMA – 011446
22 Environmental management.
Monitoring and compliance with
regulatory requirements.
Conformance with ISO 14001
systems
Finance Manager Augustine
Wireko
Asubonteng
ACCA (1142411) CA BSc –
Renewable Natural Resources
5 Financial management, reporting
and compliance
Engineering
Manager
Adriaan Stadler BEng (Mech) MBA 34 Engineering, logistics and
infrastructure management
Human Resources
Manager
Charles Klutse BA (Social Work and Administration) 13 Human resources training and
development, social responsibility
Occupational
Health and Safety
(OHS) Manager
John Otoo PgDFRM, AIMSA, MBA, BSc 10 Custodian and Management of
mine risk, exposure and
occupational hygiene monitoring
programmes
Gold Fields LimitedDamang Gold Mine
Plan showing mine infrastructure as at 31 December 20121 0.5 0 1 2 3 4 5
Kilometres
Ghana National Grid Co-ordinate System
Mining lease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mining lease Lima South . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prospecting Licenses (PL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tailings Storage Facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Open Pit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waste Dump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Roads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
National Railway. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exploration Sites/Projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Damang has the area from surface to 30m below . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tarkwa has the area from below 30m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference
Page w
idth 208 mm
Page w
idth 205 mm
12. Brief history
The history of Damang
Late 19th
century:
Several small mining companies operated the Abontiakoon concession near Tarkwa town leading to the
sinking of eight vertical shafts and excavation of numerous open pits.
1882: Operations at the underground Abosso mine exploit banket conglomerates to a depth of 850 metres.
1920: Adjah Bippo and Cinnamon Bippo underground mines to the north incorporated into the Abosso Mine
holdings.
1956: Abosso Mine ceased operation with recorded production of 2.7 Moz at an average grade of 9.8 g/t.
1989: Ranger Exploration (Ranger) began investigation of retreating tailings from the Abosso mine. Artisanal
miners appeared to be exploiting alluvium shedding from two low ridges in the area.
1990 – 1992: Pitting and trenching demonstrated near-surface mineralisation over a three-kilometre strike length.
1993 – 1996: A drilling programme and subsequent feasibility study showed that mining a mineralised quartz vein
system to a depth of 200 metres would be viable.
1997: Open pit operations commenced in August on the main pit, following the relocation of 3,000 people. Gold
production started in November at the 3.0 Mtpa capacity CIL plant.
2001: Gold Fields and Repadre sign an agreement to purchase Ranger’s 90% interest in Damang.
2003: IAMGold and Repadre merge to give IAMGold an 18.9% interest in Damang and GF Ghana a 71.1%
interest; and
Damang Expansion Project initiated to identify additional sources of ore from areas around the Main Pit.
2004: Further drilling carried out at the Main Pit and feasibility study initiated to test the viability of a cutback to
extend the life of the main pit.
2005: Drilling and Mineral Resource estimation completed for the Damang pit cutback (DPCB). AFE submitted
and approved. Waste mining at Damang cutback commenced in July. Mining at Amoanda commenced in
January and mining at Tomento commenced in July. A regional prospectivity study was completed in
November.
2006: Drilling and Mineral Resource estimation carried out in Rex, Tomento North, Tomento East, Tomento West
and Huni. Block models built for Chida, Chida South and Bonsa North with historical data. Amoanda Pit
finally depleted August 2006.
2007: Drilling and Mineral Resource estimation carried out in Rex, DPCB and Tomento West. Mining at Tomento
North Pit 2 commenced to boost oxide feed to mill.
2008: Drilling and Mineral Resource estimation carried out at Rex, Abosso Tailings and Abosso Deeps. Rex
Mineral Resource model revised and new block model built for Tomento West. Mining at Tomento East
brought forward, commenced April 2008.
2009: Drilling and Mineral Resource estimation carried out in Amoanda North, Tomento West, and Abosso
tailings. Rex Mineral Resource model revised. New Mineral Resource model developed for DPCB and
Amoanda North. Started mining at Rex and Abosso Tailings.
2010: Drilling and Mineral Resource estimation carried out at Amoanda North extension and corridor, Rex, Huni
and Juno. New resource models generated for DPCB including Juno and Huni, Amoanda and Rex.
2011: An updated Conceptual Extensional Resource Model developed for Greater Damang Pit (Huni, Damang,
Main and Juno). Portions of Phase II drilling programme were completed and incorporated into Greater
Damang PFS with resultant increase in Mineral Resource and Mineral Reserve ounces;
Quarter 1 saw move to owner mining and maintenance; and
Gold Fields Ghana Limited acquired the indirect 18.9% IAMGold interest in Damang and now holds 90%
with the remaining 10% held by the Ghanaian government.
2012: Continued pre-feasibility study for Greater Damang following the completion of the Phase ll drilling
programme. Resource in-fill and geotechnical drilling programmes completed on the Greater Damang
Extension Project. In-fill drilling and modelling of the Greater Amoanda Project completed. Planned
sterilisation drilling completed.
17 � Gold Fields – Damang Gold Mine – Technical Short Form Report 2012
Schematic 3D impression of the Greater Damang Project
Damang Mineral Resource and Mineral Reserve classification
EXPLORATIONRESULTS
MINERALRESERVES
MINERALRESOURCES
Reported as in situmineralisation estimates
Consideration of mining, metallurgical, economic, marketing, legal,environmental, social and governmental factors (the “modifying factors”)
129.6 Mt @ 2.02 g/t8.4 Moz
76.1 Mt @ 1.67 g/t4.1 Moz
67.4 Mt @ 1.74 g/t3.6 Moz
8.7 Mt @ 1.81 g/t0.5 Moz
21.6 Mt @ 2.23 g/t1.6 Moz
98.8 Mt @ 1.98 g/t6.3 Moz
9.3 Mt @ 1.94 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
Borehole tracesPit outline
Damang
Saddle
Huni
Juno
18 � Gold Fields – Damang Gold Mine – Technical Short Form Report 2012
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
BASTION GRAPHICS
Damang Gold Mine: load and haul operations
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