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Australia
Ernest Henry Mine

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 Location:
37 km NE from Cloncurry, Queensland, Australia

  Address:
PO Box 527
Cloncurry
Queensland, Australia
4824
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Sub-level caving
Production Start...
Mine Life6 years (as of Jan 1, 2022)
The Ernest Henry copper-gold operation is a large-scale, long-life asset.

On 6 January 2022, we acquired a transformational 100% ownership of Ernest Henry (economic effective date 1 January 2022) resulting in a material uplift in production and cash flow from this asset in FY22.

The Mine Extension Pre-feasibility Study from the 1,125RL to 775RL is progressing well and due for completion by December 2022. The study will benefit from the results of the current surface drilling programs targeting the ore body at a more optimal angle, and the updated Mineral Resource estimate at 30 June 2022, which resulted in a material increase (~24%) in the reported Mineral Resource to 88.3 million tonnes at 1.28% copper and 0.73g/t gold.


Owners

Source: p. 1
CompanyInterestOwnership
Evolution Mining Ltd. 100 % Indirect
Ernest Henry Mining Pty Ltd. (operator) 100 % Direct
Evolution acquired an economic interest in Ernest Henry in November 2016 for 100% of future gold and 30% of future copper and silver produced within an agreed life of mine area. Outside the life of mine area, Evolution’s interest was a 49% interest in future copper, gold and silver production from Ernest Henry.

On 17 November 2021, Evolution announced the acquisition of 100% of Ernest Henry. Evolution’s interest in Ernest Henry transitioned to 100% legal ownership of the underlying asset on 6 January 2022. The economic interest in Ernest Henry on a 100% basis transferred to Evolution on 1 January.

The Ernest Henry operations extend across eight (8) current mining leases all owned by Ernest Henry Mining Pty Ltd.

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • IOCG


Summary:

The Ernest Henry Deposit is an Iron Oxide Copper Gold (IOCG) hosted within a sequence of moderately SSE-dipping, intensely altered Paleoproterozoic intermediate metavolcanic and metasedimentary rocks of the Mt Isa group. Copper occurs as chalcopyrite within the magnetite-biotitecalcite-pyrite matrix of a 250 x 300 m pipe like breccia body. The breccia pipe dips approximately 40 degrees to the South and is bounded on both the footwall and hanging wall by shear zones. The main orebody starts to split from the 1575 level into a South-East lens, and from the 1275 level into the South-West lens. Both lenses are separated from the main orebody by waste zones, termed the Interlens and South-West Shear Zone, respectively. The orebody is open at depth.

The Ernest Henry copper-gold deposit is hosted in a hydrothermal breccia pipe plunging at roughly 45 degrees to the south, bounded between two shear zones. At depth, the orientation of shearing appears to be having a greater effect on the orebody and the primary mineralised lenses are becoming more elongate north-south, separating into discrete pods and lenses.

The Ernest Henry deposit is hosted entirely in felsic intermediate metavolcanic rocks, within a unit of the Mount Fort Constantine Volcanics, circa 1800 to 1750 million years. Regionally these lithologies lie adjacent to a large meta-diorite body which traverses the deposit from the south-west to the north-east. Timing of mineralisation at the Ernest Henry d ........


Mining Methods

  • Sub-level caving


Summary:

Ernest Henry 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 1,000m hoisting shaft with a hoisting capacity in excess of 6Mt ore per annum. The operation also has an effective and sophisticated above and below ground water management system.

The mine design uses 25 m sublevel spacing, 15 m drive spacing (centre to centre), 6 m wide cross cuts and a standard SLC drill and blast design. These design parameters are in line with benchmarked mines and assessed to be geotechnically stable.

A minimum mining width for cave propagation is in the order of 140 m based on empirical cavability assessments.

All major infrastructure for the mine has been constructed including underground crusher, conveyor system, hoisting shaft, pumping and ventilation systems. Access to the underground mine is via an in-pit portal and decline.


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:
Evolution acquired an economic interest in Ernest Henry that will deliver 100% of future gold revenue and 30% of future copper and silver revenue produced from within an agreed life of mine area.

CommodityUnits2023202220212020201920182017
Copper t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required70,03744,353
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as payable metal. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required6,728 kt6,819 kt4,378 kt
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required6,829 kt6,759 kt4,364 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required11 Mt11 Mt
Annual production capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required350,000 t of copper-gold concentrate350,000 t of copper-gold concentrate
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Reserves at December 31, 2021:
Ernest Henry Operations reported Mineral Resources and Ore Reserve are above a 0.7% Cu cut-off.

CategoryTonnage CommodityGradeContained Metal
Proven 9.8 Mt Copper 1.41 % 139 kt
Proven 9.8 Mt Gold 0.77 g/t 241 koz
Probable 19.2 Mt Copper 0.68 % 130 kt
Probable 19.2 Mt Gold 0.35 g/t 217 koz
Proven & Probable 29 Mt Copper 0.93 % 269 kt
Proven & Probable 29 Mt Gold 0.49 g/t 459 koz
Measured 13.3 Mt Copper 1.25 % 165 kt
Measured 13.3 Mt Gold 0.69 g/t 294 koz
Indicated 32.2 Mt Copper 1.29 % 416 kt
Indicated 32.2 Mt Gold 0.78 g/t 808 koz
Inferred 25.9 Mt Copper 1.17 % 304 kt
Inferred 25.9 Mt Gold 0.69 g/t 572 koz
Total Resource 71.4 Mt Copper 1.24 % 885 kt
Total Resource 71.4 Mt Gold 0.73 g/t 1,674 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -1,984 / oz   -1,706 / oz  
Cash costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† -921 / oz†   -593 / oz†  
Cash costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† -926 / oz†   -604 / oz†  
All-in sustaining costs (sold) Gold AUD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† -641 / oz†   -361 / oz†  
All-in costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† -641 / oz†   -361 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Financials:

Units202320222021
Capital expenditures (planned) M AUD  ......  Subscription required
Sustaining costs M AUD  ......  Subscription required  ......  Subscription required
Capital expenditures M AUD  ......  Subscription required
Revenue M AUD  ......  Subscription required  ......  Subscription required
EBITDA M AUD  ......  Subscription required  ......  Subscription required
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment:
HME TypeModelQuantityRef. Date
Concrete sprayer ....................... Subscription required ....................... Subscription required Jun 30, 2022
Drill (long hole) ....................... Subscription required ....................... Subscription required Mar 24, 2022
Drill (long hole) ....................... Subscription required ....................... Subscription required Mar 24, 2022
Explosives Charger ....................... Subscription required ....................... Subscription required Jun 30, 2022
Grader ....................... Subscription required ....................... Subscription required Jun 30, 2022
Jumbo ....................... Subscription required ....................... Subscription required Mar 24, 2022
Loader ....................... Subscription required ....................... Subscription required Mar 24, 2022
Loader ....................... Subscription required ....................... Subscription required Mar 24, 2022
Loader ....................... Subscription required ....................... Subscription required Mar 24, 2022
Loader - Tool Carrier ....................... Subscription required Jun 30, 2022
Loader - Tool Carrier ....................... Subscription required Jun 30, 2022
Load-Haul-Dump (LHD) ....................... Subscription required Jun 30, 2022
Load-Haul-Dump (LHD) ....................... Subscription required Jun 30, 2022
Scissor Lift ....................... Subscription required ....................... Subscription required Jun 30, 2022
Trans Mixer ....................... Subscription required Jun 30, 2022
Truck (underground) ....................... Subscription required Mar 24, 2022
Truck (water) ....................... Subscription required Jun 30, 2022
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 28, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 28, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2022
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Corporate Presentation 2022
Corporate Presentation 2022
Fact Sheet 2022
Quarterly Report 2022
Year-end Mineral Reserves 2022
................................... 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 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Fact Sheet 2018
Quarterly Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Annual Report 2017
Corporate Presentation 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Year-end Mineral Reserves 2016
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