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Australia
Agnew Complex

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 Location:
22 km SW from Lienster, Western Australia, Australia

  Address:
Sandstone Road, Agnew PMB 10
Leinster
Western Australia, Australia
6437
Phone+61 (0) 8 9088-3822
Fax+61 (0) 8 9088-3824
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sub-level stoping
  • Longhole open stoping
  • Paste backfill
On-Site Camp 650 people
Production Start1980
Mine Life2027
Agnew operates two underground mines, namely Waroonga and New Holland, now amalgamated into the Agnew One Mine Complex.
Latest NewsMLG Oz work rewarded with bigger remit at Gold Fields’ Agnew, St Ives operations     November 30, 2022


Owners

Source: p. 51
CompanyInterestOwnership
Gold Fields Ltd. 100 % Indirect
The Agnew Gold Mining Company Proprietary Limited (AGMC), was incorporated in Australia in 2001 as the legal entity holding and conducting mining activity on the Agnew mineral leases. Gold Fields holds 100% of the issued shares of AGMC through its 100% holding in the issued shares of Orogen Holding (BVI) Limited.

Contractors

ContractorContractDescriptionRef. DateExpirySource
Barminco Holdings Pty Ltd. Mining February 2, 2021 - Gold Fields has awarded a $200 million contract extension to Barminco for underground mining at the Agnew gold mine in Western Australia. The underground miner has been operating at Agnew since 2010, and will continue to provide full underground mining services due to an increase in development and production physicals on site. This extension will take its current term out to December 2023. Feb 2, 2021 2023
EDL Power supply The Agnew Hybrid Renewable Project has delivered Australia’s largest hybrid renewable energy microgrid—the first in the country to utilise wind generation on a large scale at a mine site. EDL delivered this innovative hybrid renewable energy system under a 10-year agreement with Gold Fields. Start of operation: May 2020 The microgrid at Agnew comprises four key components managed by an advanced control system: • five 110m wind turbines, each with a rotor diameter of 140m, delivering 18MW • a 10,710-panel solar farm generating 4MW • a 13MW/4MWh battery system • off-grid 21MW gas/diesel engine power plant. Jan 5, 2022 10
MLG Oz Ltd. Mining The renewal and extension of contracts with Gold Fields, meanwhile, will see MLG’s current Agnew operations continue, with the term extended for a minimum three-year period with an additional optional extension period of two years at Gold Fields’ discretion. This award extends MLG’s delivery of integrated site services and haulage activities to Gold Fields’ Agnew operation out to 16 years. At Barren Lands, the open-pit mining contract award with Gold Fields will see MLG Oz develop a new pit through the provision of heavy earthworks. Included within this is a Liebherr 9150 excavator. Nov 30, 2022 16


Deposit Type

  • Vein / narrow vein
  • Orogenic

Source: Source

Summary:

Agnew is situated in the northern portion of the Norseman-Wiluna Greenstone Belt of the Yilgarn Craton, Western Australia. Locally, the belt comprises a sequence of mafic to ultramafic volcanics and associated interflow sediments, which were folded to form the Lawlers anticline. The mafic and ultramafic volcanics of the Lawlers anticline are unconformably overlain by a sequence of clastic sediments comprising the Scotty Creek formation. The sedimentary rocks were metamorphosed to lower greenschist facies, comprising conglomerates and very fine to very coarse-grained pebbly sandstones and siltstones. The Agnew deposits are broadly hosted by the intersections between various structures and the relative stratigraphy. Gold mineralisation largely occurs in quartz veins in the sedimentary units of the Scotty Creek formation. Orogenic greenstone gold deposits (hydrothermal) are hosted in several different styles of lodes. Although all 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. Mineralisation zones are discontinuous with short range predictability.


Mining Methods

  • Sub-level stoping
  • Longhole open stoping
  • Paste backfill

Source:

Summary:

Agnew operates two underground mines, namely Waroonga and New Holland, now amalgamated into the Agnew One Mine Complex. At Waroonga, ore is sourced from the Waroonga North, Kath, Fitzroy Bengal Hastings (FBH), Main and Kim lodes, accessed via declines. New Holland mining occurs in four primary areas: Sheba South, Sheba, Cinderella and Himitsu. These areas are accessed via declines.

The primary mining method at Waroonga is long-hole sublevel stoping with paste fill. The New Holland mining method depends on the geometry of the ore structure with the primary method being long-hole open stoping.


Crushing and Grinding
Source: Subscription required

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Processing

  • Gravity separation
  • Intensive Cyanidation Reactor (ICR)
  • Carbon re-activation kiln
  • Centrifugal concentrator
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Source
Source: Source

Summary:

The Agnew processing plant consists of a three-stage crushing circuit, two stage in-series ball milling circuit with two Knelson gravity concentrators, an in-line leach reactor and gravity electrowinning circuit. The carbon in pulp (CIP) circuit consists of air agitated Pachuca tanks, followed by a pressure Zadra elution circuit with carbon generation. The CIP process involves mixing milled ore with lime and water to form a 45% solids slurry with a pH of approximately 10. A cyanide solution is used to extract gold (Au) from the slurry. Carbon is added to the solution to capture gold via adsorption. The gold is then recovered from the carbon under high temperature and pressure using sodium hydroxide and sodium cyanide. Gold is plated onto stainless steel mesh via a process of electrowinning. The primary waste product from the process is a slurry (tailings) containing reject fines, process chemicals and cyanide residues with an elevated pH. This tailings slurry is deposited into TSF3 (Redeemer In-pit Tailings Facility) which has been active since May 2004.

Recoveries & Grades:

CommodityParameter2021202020192018201720162015
Gold Recovery Rate, % 9594.694.294.294.493.694.8
Gold Head Grade, g/t 5.85.85.76.496.56.56.4

Production:

CommodityUnits2022202120202019201820172016
Gold koz 251 ^223233219238241229
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.

Operational Metrics:

Metrics202120202019201820172016
Total tonnes mined 1,941 kt2,044 kt1,961 kt1,955 kt1,905 kt1,983 kt
Ore tonnes mined 1,048 kt1,294 kt1,284 kt1,216 kt1,174 kt1,208 kt
Waste 893 kt750 kt678 kt739 kt731 kt774 kt
Plant annual capacity 1.35 Mt1.3 Mt1.3 Mt1.3 Mt1.3 Mt1.3 Mt
Tonnes processed 1,254 kt1,357 kt1,231 kt1,178 kt1,235 kt1,176 kt

Reserves at December 31, 2021:
Mineral Resources cut-off for underground 2.2 – 4.1 g/t
Mineral Resources cut-off for open pit 0.76 – 0.93 g/t
Mineral Reserves cut-off for fresh ore 2.6 – 4.6 g/t
Mineral Reserves cut-off for oxide ore 0.85 – 1.04 g/t

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Stockpiles 13 kt Gold 8.01 g/t 3 koz
Proven In-Situ (UG) 6 kt Gold 5.47 g/t 1 koz
Proven Total 19 kt Gold 7.2 g/t 4 koz
Probable In-Situ (OP) 408 kt Gold 3.3 g/t 43 koz
Probable In-Situ (UG) 4,712 kt Gold 6.37 g/t 966 koz
Probable Total 5,120 kt Gold 6.13 g/t 1,009 koz
Proven & Probable Stockpiles 13 kt Gold 8.01 g/t 3 koz
Proven & Probable In-Situ (OP) 408 kt Gold 3.3 g/t 43 koz
Proven & Probable In-Situ (UG) 4,718 kt Gold 6.37 g/t 967 koz
Proven & Probable Total 5,138 kt Gold 6.13 g/t 1,013 koz
Measured Stockpiles 13 kt Gold 8.01 g/t 3 koz
Measured In-Situ (UG) 108 kt Gold 5.82 g/t 20 koz
Measured Total 121 kt Gold 6.05 g/t 24 koz
Indicated In-Situ (OP) 2,364 kt Gold 2.88 g/t 219 koz
Indicated In-Situ (UG) 9,756 kt Gold 6.56 g/t 2,059 koz
Indicated Total 12,120 kt Gold 5.85 g/t 2,278 koz
Inferred In-Situ (OP) 751 kt Gold 3.55 g/t 86 koz
Inferred In-Situ (UG) 6,888 kt Gold 4.64 g/t 1,027 koz
Inferred Total 7,639 kt Gold 4.53 g/t 1,112 koz
Total Resource Stockpiles 13 kt Gold 8.01 g/t 3 koz
Total Resource In-Situ (OP) 3,116 kt Gold 3.04 g/t 305 koz
Total Resource In-Situ (UG) 16,752 kt Gold 5.77 g/t 3,106 koz
Total Resource Total 19,880 kt Gold 5.34 g/t 3,414 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
All-in sustaining costs (sold) Gold USD 1,170 / oz ^†   1,164 / oz†   1,017 / oz†   1,152 / oz†   1,026 / oz†   977 / oz†   971 / oz†  
All-in costs Gold USD 1,340 / oz ^†   1,308 / oz†   1,053 / oz†   1,152 / oz†   1,026 / oz†   977 / oz†   971 / oz†  
^ Guidance / Forecast.
† Net of By-Product.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD 97  
Growth Capital M USD 32  9  41  
Sustaining costs M USD 56.3  43  35.5  
Capital expenditures M USD 88.2  52  76.1   73   74   70  
Revenue M USD 402  411.5  304.6   301.1   302.6   285.4  
Operating Income M USD 67.8  
Gross profit M USD 144.9  



Heavy Mobile Equipment as of July 14, 2014:
Source: Source p.39
HME TypeModelQuantity
Drill Atlas Copco 2
Drill 2
Jumbo Sandvik 2
Jumbo Sandvik 2
Loader Caterpillar 4
Loader Caterpillar 4
Truck (underground) Atlas Copco 8
Truck (underground) 4

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
Alternate Underground Manager Nick Tait LinkedIn Apr 6, 2022
General Manager Jason Sander +61 (0) 8 9088-3801 jason.sander@goldfields.com.au LinkedIn Apr 6, 2022
Maintenance Superintendent Neil Freebury LinkedIn Apr 6, 2022
Mobile Maintenance Superintendent Jim Innes LinkedIn Apr 14, 2022
Processing Manager Tristan Freemantle +61 (0) 8 9088 3822 tristan.freemantle@goldfields.com.au LinkedIn Apr 14, 2022
Underground Mine Manager Karen Davtyan LinkedIn Apr 6, 2022

Staff:

EmployeesYear
605 2021
605 2020
605 2019
605 2018
605 2017
620 2016

Corporate Filings & Presentations:

DocumentYear
Annual Report 2021
Financial Review 2021
Form 20-F 2021
Technical Report 2021
Year-end Mineral Reserves 2021
Annual Report 2020
Financial Review 2020
Form 20-F 2020
Other 2020
Year-end Mineral Reserves 2020
Annual Report 2019
Integrated Report 2019
Year-end Mineral Reserves 2019
Form 20-F 2018
Year-end Mineral Reserves 2018
Form 20-F 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Financial Review 2016
Other 2016
Year-end Mineral Reserves 2016
Financial Review 2015
Year-end Mineral Reserves 2015
Corporate Presentation 2014
Technical Report 2012

News:

NewsDate
MLG Oz work rewarded with bigger remit at Gold Fields’ Agnew, St Ives operations November 30, 2022

Aerial view:

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