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Australia
Ernest Henry Mine

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 Location:
36 km NE from Cloncurry, Queensland, Australia

  Address:
PO Box 527
Cloncurry
Queensland, Australia
4824
Phone  ...  Subscription required
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  • Overview
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  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Sub-level caving
Processing
  • Flotation
Mine Life2026
Latest NewsGlencore awards Orica explosives contract     November 10, 2020


Owners & OPERATOR

Source: p. 184
CompanyInterestOwnership
Evolution Mining Ltd. 30 % Indirect
Glencore plc. 70 % Indirect
Ernest Henry Mining Pty Ltd. (operator) 100 % Direct
In October 2016, Glencore entered into an agreement with Evolution Mining Limited, whereby Glencore received $669 million cash in return for a 30% economic interest in the Ernest Henry Mine mining operation (“EHM”) and an entitlement to 100% of the gold produced from Glencore’s remaining 70% interest in EHM.

Deposit Type

  • Breccia pipe / Stockwork
  • IOCG


Summary:

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.

Copper and gold mineralisation occurs in a breccia comprised of strongly altered and replaced intermediate volcanic fragments in a matrix assemblage of predominantly magnetite, chalcopyrite and carbonate. Copper occurs as chalcopyrite and gold is strongly associated with chalcopyrite.

Economic mineralisation at E1 occurs as breccia-hosted mineralisation within the footwall volcanics at E1 North, and as strata bound, replacement style mineralisation within the mineralised sedimentary units at E1 North, Central, South and East.

Monakoff: As per 2015, Monakoff and Monakoff East remain excluded from the Ore Reserves. The expiry date of relevant tenements is 31 October 2032.

Economic mineralisation at Monakoff and Monakoff East occurs in very-fine to medium grained steeply dipping metasediment units.


Mining Methods

  • Sub-level caving


Summary:

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 1 km 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.


Crushing and Grinding


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

Ore mined at Ernest Henry Mining is processed at on-site concentrator.

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.

The ore is crushed and ground in a series of mills before being mixed with water and various chemicals that help to liberate or separate the copper and gold from the remaining material.

During the flotation process, the minerals attach themselves to bubbles and float to the surface of the flotation cells where they are captured. This mineral-rich mixture is dewatered to form the final copper-gold concentrate.

The concentrator is a single line plant with an annual throughput capacity of 11 million tonnes of primary ore a year. It has the capacity t ........

Recoveries & Grades:

CommodityParameter201920182017
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 0.580.560.56
Subscription required - Subscription is required.

Production:

CommodityUnits2020201920182017
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required60,259
Copper t  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as payable metal. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Annual production capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGrade
Proven 6.1 Mt Copper 1.5 %
Proven 6.1 Mt Gold 0.8 g/t
Probable 38.2 Mt Copper 0.92 %
Probable 38.2 Mt Gold 0.47 g/t
Proven & Probable 44.2 Mt Copper 1 %
Proven & Probable 44.2 Mt Gold 0.52 g/t
Measured 8.1 Mt Copper 1.18 %
Measured 8.1 Mt Gold 0.65 g/t
Indicated 57.7 Mt Copper 1.17 %
Indicated 57.7 Mt Gold 0.62 g/t
Measured & Indicated 65.8 Mt Copper 1.17 %
Measured & Indicated 65.8 Mt Gold 0.62 g/t
Inferred 15.5 Mt Copper 1.17 %
Inferred 15.5 Mt Gold 0.62 g/t

Commodity Production Costs:

CommodityUnits2020201920182017
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required -1,706 / oz
Cash costs (sold) Gold AUD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† -604 / oz†
Cash costs Gold AUD  ......  Subscription required†  ......  Subscription required† -593 / oz†
All-in sustaining costs (sold) Gold AUD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† -361 / oz†
All-in costs Gold AUD  ......  Subscription required†  ......  Subscription required† -361 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 31, 2020
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Annual Report 2017
Corporate Presentation 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Subscription required - Subscription is required.

News:

NewsDate
Glencore awards Orica explosives contract November 10, 2020

Aerial view:

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