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St Ives

St Ives is a well-established operation comprising a mix of ‘owner-mined’, open pit and underground operations feeding the Lefroy CIL mill with a current capacity of 4.7Mtpa.

The tenement holdings are located in the highly prospective Norseman-Wiluna Greenstone Belt and encompass under-explored ground that has been recently acquired or is defined as new exploration space because of innovative new models for target generation. An intensified exploration programme continues to be a key anchor in replacing Mineral Reserves and growing operational flexibility going forward. The Invincible open pit, now a cornerstone of production at the mine, represented a major discovery in 2012 and in conjunction with the growing potential at Invincible underground, Invincible South and Incredible, has emphasised the high prospectivity of the Speedway corridor, which is prioritised in the 2016 exploration campaign.

Asset fundamentals

Asset fundamentals    
General location   The St Ives mining operations extend from five to 25 kilometres south-southwest of the town of Kambalda in Western Australia, approximately 630 kilometres east of Perth at latitude 31° 12’ S and longitude 121° 40’ E. The nearest major settlement is the town of Kalgoorlie situated 80 kilometres to the north. Wellestablished power grids, access roads and supporting infrastructure exist in the area.
Licence status and
  St Ives controls exploration and mineral rights over a total area of 119,784 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
and mineral processing
  St Ives currently operates one underground mine, which is accessed via a decline, and three open pits, a centralised administrative office, an engineering workshop and a 4.7Mtpa CIP processing plant.
Climate   St Ives is situated in an area of arid bush land. While occasional storm activity may cause minor delays to open pit mining operations, the climatic conditions do not materially impact on the normal operations of the site.
Deposit type   Archaean orogenic greenstone gold hosted in a number of different styles of mineralisation. Lode, supergene and palaeoplacer-style deposits characterise the range of ore body types.
LoM   Ongoing extensional and brownfields exploration continues and could increase the LoM. It is estimated that the current known Mineral Reserves will be depleted in 2020 (five years).
health and safety
  The mine maintained OHSAS 18001 Occupational Health and Safety Management System certification and ISO 14001 Environmental Management System certification. St Ives was certified as fully compliant with the ICMC on 3 June 2009. Re-certification is underway.

Brief history of St Ives

Gold was discovered at Kambalda Red Hill camp in 1897 and during the following 10 years, other gold-bearing locations, such as Victory, were discovered with an estimated total production of 31koz, mostly from the Red Hill group of mines.

Iron-nickel sulphides were discovered near the old Red Hill mine. Western Mining Corporation (WMC) acquired ground and developed a mining and milling operation. From 1966 to 1996, the region produced approximately 34.0Mt of ore at an average grade of 3.1% nickel.

In 1981, the Victory-Defiance complex (Leviathan area) was discovered. Gold production commenced at St Ives using a 0.5Mtpa treatment plant (later expanded to 1.2Mtpa) located at the Kambalda Nickel Concentrator site. In 1988, a new 3.1Mtpa CIL facility was constructed 25 kilometres south of Kambalda at St Ives.

During 2001, a 2.0Mtpa heap leach facility was commissioned during the period when Gold Fields Limited acquired St Ives. In 2004, the 4.8Mtpa Lefroy mill was constructed and fully commissioned in early 2005.

An aggressive exploration programme was started in 2006, with full field air core drilling, and in 2007, the Cave Rocks and Belleisle underground mines were established. Initiation of the consolidated Leviathan open pit area commenced in 2008.

The Athena-Hamlet deposit was discovered in 2009. This was followed by continued discovery and growth of the Hamlet deposit and commencement of the Athena mine with the first ore intersected in May 2010. Athena reached commercial levels of production in September 2011. Hamlet development intersected first ore in October 2011 as part of a new mine development programme.

During 2012, stoping commenced at Hamlet and Cave Rocks LoM was extended, as well as an early-stage discovery of a new camp (Invincible deposit). In addition, conversion to open pit, owner mining was completed and heap leach processing stopped.

The ongoing exploration strategy delivered the Invincible deposit in 2013, with current Mineral Resources in excess of 0.97Moz and an open pit and underground Mineral Reserve of 540koz and 165koz respectively. First production was achieved at Invincible in Q1 2015. Depth and lateral extensions at Invincible were identified and, along with the newly discovered Invincible South underground deposit, will be actively explored as part of the 2016 exploration programme.

Key developments at St Ives

Establishment and ongoing production from the Invincible open pit initiated in Q1 2015
Discovery of Invincible South underground resource. Current total Mineral Resource for Invincible South of 312koz, which is open down plunge
Exploration of early stage targets along the highly prospective Invincible (Speedway) trend and Eastern Causeway are providing encouraging results
Neptune open pit, stage 1 stockpiles processed with positive gold reconciliation. Development of Stage 2 Neptune commenced in 2015 with production in 2016
Invincible underground exploration and down dip growth continued in 2015
Definition and drill testing of the extensive palaeochannel network across tenements initiated for shallow, high-grade placer deposits
Athena is near completion and mining of final stopes is scheduled in early 2016
Cave Rocks mine placed on care and maintenance in Q2 2015
Approval for in-pit tailing disposal at Leviathan granted in 2015
Ongoing evaluation and elimination of marginal Mineral Resources and Mineral Reserves contributed to improved quality but lower tonnages primarily at Greater Santa Ana, Swiftsure and Cave Rocks

Plan of the St Ives mining area

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Geographic location
Geographic location

Related links
›  Detailed disclosure of the St Ives region in the 2015 integrated report
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