Evolution Ownership
Evolution has acquired an economic interest in Glencore’s Ernest Henry operation, for A$880 million and an obligation to meet a proportion of future production costs. For detailed information please read the Investor presentation.

~35km north east of Cloncurry, Queensland, Australia

Local Communities
Cloncurry, Mt Isa


  • 1974: ML2671 awarded to Savage Exploration Pty Ltd, a wholly owned subsidiary of Savage Resources Ltd (“Savage”)
  • 1993: Savage Exploration Pty Ltd changed its name to Ernest Henry Mining Pty Ltd (“EHM”)
  • 1993: MIM Holdings Ltd (“MIM”) acquired a 51% stake in EHM from Savage
  • March 1998: Commercial production commenced as an open pit mine
  • 1999: Pasminco Ltd acquired Savage
  • 2001: Pasminco Ltd opted to sell Savage’s remaining 49% ownership of EHM and MIM executed its pre-emptive right to buy
  • 2001: MIM onsold it’s 49% interest in EHM to a company controlled by Westpac and entered into an option agreement
  • 2002: MIM executed its option and acquired the 49% in EHM from Westpac (moving to 100% holding of EHM)
  • 2003: Xstrata plc acquired MIM
  • 2009: Xstrata plc  announced a $589 million project to transition the operations to underground shaft mining
  • 2011: Trucking ore from underground commenced in December 2011 upon completion of the Ernest Henry open pit
  • 2013: Glencore plc acquired Xstrata plc
  • 2014: Hoisting operations commenced from a new kilometre-deep underground shaft in June 2014
  • 2016: Evolution and Glencore announces an agreement where Evolution will have a 30% economic stake in the mine and be entitled to 100% of Ernest Henry gold production, subject to an agreed life of mine and block model

Style of mineralisation
Iron oxide copper-gold deposit

Contained metals
Copper, gold, silver

Measured, Indicated and Inferred Resources (at 31 Dec 2017)
95.30Mt at 0.63g/t gold  for 1.92Moz
28.59Mt at 1.17% copper for 334kt

Ore Reserves (as at 31 Dec 2017)
51.40Mt at 0.55g/t gold for 902koz
15.42Mt at 1.07% copper for 165kt

Year commenced operations

Mining Method
Underground – sub level cave

Gold Production
CY2015: 65kt Cu & 88koz Au (in concentrate)

Processing Method
Ernest Henry’s concentrator is a conventional single-line processing circuit producing a bulk copper-gold sulphide flotation concentrate.

Nominal treatment rate

The Ernest Henry iron oxide copper-gold deposit is located in the Cloncurry district within the Eastern Succession of the Mt Isa Inlier. The orebody is hosted within the Mt Fort Constantine volcanics, a sequence of intensely altered felsic to intermediate metavolcanics (dacite, andesite and basalt) and metasedimentary rocks that are Paleoproterozoic (1740Ma) in age. The orebody has no natural surface outcrop and lies beneath 50m of Phanerozoic cover comprising of clays, gravels and sands. The Ernest Henry deposit is a breccia pipe plunging approximately 45° to the south-southeast and is bounded between northeast trending ductile shear zones.

The operation is an underground mining operation employing sub-level caving ore extraction method. There is also an underground primary crusher and ore handling system. Ore is brought to surface via a 1km hoisting shaft with a hoisting capacity in excess of 6Mt ore p.a. The operation also has an effective and sophisticated above and below ground water management system.

Copper and gold are recovered from the ore using traditional grinding and flotation methods in the concentrator. Magnetite is liberated during this process and the magnetite extraction plant allows it to be recovered from the concentrator tailings stream.

The plant has a current processing rate of ~6.4Mt p.a. (8.5Mt p.a. capacity and scalable to ~11Mt p.a.). The concentrator incorporates grinding (four mills), conventional flotation and dewatering. A single copper-gold-silver concentrate is produced by a rougher and a three stage cleaning circuit. The Concentrate is treated at Glencore’s Mt Isa smelter (~150km trucking distance) and metal is refined at Glencore’s Townsville refinery.