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Australia
St Ives Mine

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

  Address:
PO Box 359
Kambalda
Western Australia, Australia
6831
Phone  ...  Subscription required
Fax+61 8 9088 1112
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
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  • Costs & Financials
  • Fleet
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  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Longhole open stoping
  • Paste backfill
Production Start...
Mine Life2030


Owners

Source: p. 213, 373
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.

Contractors

Subscription required - Subscription is required.


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 has four underground mine areas and seven open pits contributing to the Mineral Reserve. There are seven underground mines and 16 open pits contributing to the Mineral Resource.

St Ives operated two underground mines and two open pits in 2021.

The underground mines are accessed via a decline. Mining contractors (Invincible and Hamlet) and owner operator fleet (Hamlet) deploy long-hole stoping and paste/rock fill. Current underground mines are relatively shallow and 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 conducted using an owner-operator mining fleet.

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.

The current active Leviathan in-pit TSF (with a Low ANCOLD consequence rating) has enough capacity to store the remaining LoM volumes.

Emphasis has been on the continued expansion of the Invincible underground operations with full production now established. Ore production from the Invincible Complex now exceeds 2Mtpa. Highly prospective targets continue to be explored along the strike of Invincible South in the Greater Invincible area.

Open-pit production continued at Neptune with mining comp ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required367364363
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Total tonnes mined  ......  Subscription required  ......  Subscription required15,167 kt22,044 kt43,012 kt43,973 kt
Ore tonnes mined  ......  Subscription required  ......  Subscription required5,080 kt4,307 kt4,466 kt4,300 kt
Waste  ......  Subscription required  ......  Subscription required10,087 kt17,737 kt38,547 kt39,674 kt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required2.4 5.1 9.6 10.7
Plant annual capacity  ......  Subscription required  ......  Subscription required4.7 Mt4.7 Mt4.7 Mt4.7 Mt
Tonnes processed  ......  Subscription required  ......  Subscription required4,466 kt4,250 kt4,198 kt4,046 kt
Subscription required - Subscription is required.

Reserves at December 31, 2021:
Mineral Resources: Cut-off for oxide ore 0.79 – 1.05 g/t; Cut-off for fresh ore 0.71 – 3.8 g/t; Cut-off for mill feed 0.71 – 1.05 g/t; Cut-off for open pit 0.71 – 1.05 g/t; Cut-off for underground 1.9 – 3.8 g/t.
Mineral Reserves: Cut-off for oxide ore 0.35 – 0.35 g/t; Cut-off for fresh ore 0.35 – 3.5 g/t; Cut-off for mill feed underground 2.5 – 3.5 g/t; Cut-off for mill feed open pit 0.35 – 0.40 g/t.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Stockpiles 2,906 kt Gold 1.56 g/t 146 koz
Proven In-Situ (OP) 63 kt Gold 2.21 g/t 4 koz
Proven In-Situ (UG) 1,734 kt Gold 5.14 g/t 287 koz
Proven Total 4,703 kt Gold 2.89 g/t 437 koz
Probable In-Situ (OP) 3,852 kt Gold 2.27 g/t 282 koz
Probable In-Situ (UG) 11,526 kt Gold 4.57 g/t 1,693 koz
Probable Total 15,378 kt Gold 3.99 g/t 1,975 koz
Proven & Probable Stockpiles 2,906 kt Gold 1.56 g/t 146 koz
Proven & Probable In-Situ (OP) 3,915 kt Gold 2.27 g/t 286 koz
Proven & Probable In-Situ (UG) 13,260 kt Gold 4.64 g/t 1,980 koz
Proven & Probable Total 20,081 kt Gold 3.74 g/t 2,412 koz
Measured Stockpiles 2,906 kt Gold 1.56 g/t 146 koz
Measured In-Situ (OP) 701 kt Gold 2.97 g/t 67 koz
Measured In-Situ (UG) 2,110 kt Gold 5.35 g/t 363 koz
Measured Total 5,716 kt Gold 3.13 g/t 575 koz
Indicated In-Situ (OP) 7,400 kt Gold 2.67 g/t 634 koz
Indicated In-Situ (UG) 14,334 kt Gold 5.21 g/t 2,400 koz
Indicated Total 21,734 kt Gold 4.34 g/t 3,034 koz
Inferred In-Situ (OP) 1,806 kt Gold 2.72 g/t 158 koz
Inferred In-Situ (UG) 7,990 kt Gold 4.26 g/t 1,093 koz
Inferred Total 9,796 kt Gold 3.97 g/t 1,252 koz
Total Resource Stockpiles 2,906 kt Gold 1.56 g/t 146 koz
Total Resource In-Situ (OP) 9,907 kt Gold 2.7 g/t 859 koz
Total Resource In-Situ (UG) 24,434 kt Gold 4.91 g/t 3,856 koz
Total Resource Total 37,247 kt Gold 4.06 g/t 4,861 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 902 / oz†   916 / oz†   949 / oz†  
All-in costs Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 902 / oz†   916 / oz†   949 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Growth Capital M USD  ......  Subscription required  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 127   156   140  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 127   156   140  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 464.7   457.3   452.3  
Subscription required - Subscription is required



Heavy Mobile Equipment as of September 21, 2021:
HME TypeModelSizeQuantity
Loader ....................... Subscription required 18 t ....................... Subscription required
Truck (underground) ....................... Subscription required 50 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2022
....................... Subscription required ....................... Subscription required ....................... Subscription required Feb 10, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2020
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
Other 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 20-F 2018
Other 2018
Year-end Mineral Reserves 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
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