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Australia
St Ives Mine

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 Location:
65 km SE from Coolgardie, Western Australia, Australia

  Regional Office:
Level 5, 50 Colin Street
West Perth
Western Australia, Australia
6005
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit / Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Longhole open stoping
  • Paste backfill
Processing
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
Mine Life9 years (as of Jan 1, 2019)


Owners

Source: p. 370, 421
CompanyInterestOwnership
Gold Fields Ltd. 100 % Indirect
Gold Fields Limited indirectly owns 100% interest in the St Ives mine through it's wholly owned subsidiary St Ives Gold Mining Company (Pty) Ltd.

Deposit Type

  • Vein / narrow vein
  • Mesothermal
  • Paleoplacer


Summary:

St Ives lies within the Kambalda domain, a subset of the Norseman-Wiluna Belt. The Kambalda domain is bound by the north-northwest trending Boulder-Lefroy fault (BLF) and Zuleika shear. The region has undergone four compressional events predated by early extension, and has been metamorphosed to upper greenschist or lower amphibolite facies.

The main structural feature of the St Ives area is the gently south-plunging Kambalda anticline, which extends 35km from the south end of the Kambalda dome to the Junction mine. The majority of known gold deposits are proximal to the trace of the anticlinal axis. A major second order structure known as the Playa shear splays off the BLF shear zone and can be traced through the St Ives field for a distance in excess of 10km.

There are several styles of gold mineralisation at St Ives. Individual deposits may contain more than one of these styles:

• Lode mineralisation: Archaean lode mineralisation typically consisting of 0.5m to 20m wide mesothermal vein complexes that may also have hydraulic breccias and/or mylonites. Mineralisation is typically discontinuous with short range predictability
• Supergene mineralisation: Broad zones of flat-lying gold mineralisation in weathered Archaean and overlying tertiary sediments
• Palaeoplacer mineralisation: Placer deposits hosted by palaeochannels in the unconsolidated tertiary sediments that overlie the Archaean basement.


Mining Methods

  • Truck & Shovel / Loader
  • Longhole open stoping
  • Paste backfill


Summary:

St Ives currently operates three underground mines and one open pit. The underground is accessed via a decline. Mining contractors deploy long-hole stoping and paste/rock fill. Current underground mines are relatively shallow and are configured to mitigate geotechnical seismic risk through mine design, scheduling and defined ground support regimes.

Open pits are mined using conventional drill and blast with truck and shovel. Surface mining operations are carried out using contract mining.

Ore from both open pit and underground operations is transported with road trains from individual
mining operations to the central St Ives processing RoM pad.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
SAG mill
Ball mill

Summary:

St Ives operates a 4.7Mtpa processing plant that consists of primary crushing, SAG/Ball milling, gravity and CIP circuits.


Processing

  • Gravity separation
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning

Source: Subscription required

Summary:

The Lefroy Mill was commissioned in December 2004 and achieved design capacity within seven months. It treats medium- to high-grade ore through a 4.8 Mtpa variablespeed dual-direction 13.5 MW sag mill with wrap-around motor. Oversize from the mill (scats) is in closed circuit with a 140-tonne-per-hour pebble crusher. A gravity circuit recovers the gravity-recoverable gold from the milling circuit and the concentrate is treated separately through to bullion form. The mill cyclone overflow product flows to a five-stage leach circuit consisting of mechanical agitators, reagent addition and oxygen sparging.

Leached slurry passes through the six-stage carousel pump cell adsorption plant and subsequent five-tonne-capacity acid wash, elution and electrowinning circuits which produce calcine ready for smelting. Bullion is shipped to the refinery. Tailings are alternately deposited on two paddock-type tailings facilities which are constructed upstream.

Recoveries & Grades:

CommodityParameter201920182017201620152014
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 2.762.882.9633.22.6
Subscription required - Subscription is required.

Production:

CommodityUnits202020192018201720162015
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required364363372
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required43,973 kt24,418 kt19,517 kt
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required4,300 kt3,033 kt3,705 kt
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required39,674 kt21,385 kt15,813 kt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required10.7 11.5 9.29
Plant annual capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required4.7 Mt4.7 Mt
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required4,046 kt3,867 kt4,553 kt
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Stockpiles 4,240 kt Gold 1.1 g/t 149 koz
Proven In-Situ (OP) 170 kt Gold 1.53 g/t 8 koz
Proven In-Situ (UG) 553 kt Gold 4.61 g/t 82 koz
Proven Total 4,963 kt Gold 1.5 g/t 240 koz
Probable In-Situ (OP) 7,329 kt Gold 2 g/t 476 koz
Probable In-Situ (UG) 8,502 kt Gold 5.73 g/t 1,567 koz
Probable Total 15,894 kt Gold 4 g/t 2,043 koz
Proven & Probable Stockpiles 4,240 kt Gold 1.1 g/t 149 koz
Proven & Probable In-Situ (OP) 7,562 kt Gold 1.99 g/t 484 koz
Proven & Probable In-Situ (UG) 9,056 kt Gold 5.66 g/t 1,649 koz
Proven & Probable Total 20,858 kt Gold 3.4 g/t 2,283 koz
Measured Stockpiles 4,240 kt Gold 1.1 g/t 149 koz
Measured In-Situ (OP) 597 kt Gold 2.56 g/t 49 koz
Measured In-Situ (UG) 977 kt Gold 4.81 g/t 151 koz
Measured Total 5,814 kt Gold 1.84 g/t 350 koz
Indicated In-Situ (OP) 9,104 kt Gold 2.94 g/t 860 koz
Indicated In-Situ (UG) 11,854 kt Gold 5.89 g/t 2,264 koz
Indicated Total 20,958 kt Gold 4.61 g/t 3,106 koz
Inferred In-Situ (OP) 2,707 kt Gold 2.61 g/t 277 koz
Inferred In-Situ (UG) 4,989 kt Gold 4.49 g/t 721 koz
Inferred Total 7,696 kt Gold 3.83 g/t 947 koz
Total Resource Stockpiles 4,240 kt Gold 1.1 g/t 149 koz
Total Resource In-Situ (OP) 12,408 kt Gold 2.85 g/t 1,135 koz
Total Resource In-Situ (UG) 17,820 kt Gold 5.44 g/t 3,118 koz
Total Resource Total 34,468 kt Gold 3.97 g/t 4,403 koz

Commodity Production Costs:

CommodityUnits2020201920182017201620152014
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 916 / oz† 949 / oz† 969 / oz† 1,164 / oz†
All-in costs Gold USD  ......  Subscription required†  ......  Subscription required† 916 / oz† 949 / oz† 969 / oz† 1,164 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2020201920182017201620152014
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 114.5   117.5  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 114.5   117.5  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 431.8   458.8  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 16, 2020
....................... Subscription required ....................... Subscription required Subscription required Nov 16, 2020
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Form 20-F 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Financial Review 2016
Year-end Mineral Reserves 2016
Financial Review 2015
Year-end Mineral Reserves 2015
Technical Report 2012
Subscription required - Subscription is required.

Aerial view:

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