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Australia
Mt Carlton Mine

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 Location:
136 km SE from Townsville, Queensland, Australia

  Regional Office:
Level 24 175 Liverpool Street
Sydney
New South Wales, Australia
2000
Phone  ...  Subscription required
Fax+61-2-9696-2901
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
  • Copper
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Filter press plant
  • ACACIA reactor
  • Gravity separation
  • Centrifugal concentrator
  • Flotation
  • Concentrate leach
  • Carbon in leach (CIL)
  • Cyanide (reagent)
Mine Life2025
On 15 December 2021, Navarre Minerals completed the acquisition of the Mt Carlton gold mining and processing operation from Evolution Mining Ltd, which included the Crush Creek exploration project.
Latest NewsNavarre Obtains “Outstanding” High-Grade Mt Carlton United Gold Results     April 22, 2022


Owners

Source: p. 18
CompanyInterestOwnership
Navarre Minerals Ltd. 100 % Indirect
On 15 December 2021, Navarre Minerals completed the acquisition of the Mt Carlton gold mining and processing operation from Evolution Mining Ltd, which included the Crush Creek exploration project.

Deposit Type

  • Epithermal


Summary:

The Mt Carlton project is a high sulphidation epithermal style deposit with mineralisation occurring within felsic volcanic rocks on the northern margin of the Permian Bowen Basin. The project is comprised of gold, silver and copper. Later andesitic volcaniclastics overlies a rhylotic sequence which in turn underlies a package of sediments and conglomerates. Mineralisation is structurally controlled which is exclusively hosted within the advanced argillic altered rhyodacite. Discrete and discontinuous steeply dipping ENE trending breccia dominated quartz - sulphosalt infilled veins form high grade bonanza lodes. Paragenetically, the sulphosalts replace sphalerite and galena which are associated with late stage copper sulphides. Coarse gold occurs as small grains (0.1 mm) at quartz-sulphide infill contacts and in sulphosalts. Basaltic/doleritic dykes which mirror pre existing structures cross cut mineralisation.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Production is derived solely from the V2 deposit following the completion of the silver rich A39 deposit in FY14. The V2 deposit is flat lying and situated 20m to 180m below surface and is approximately 70m thick with a 500m by 500m areal extent. Open pit mining is by conventional drill and blast, load and haul methodologies, mining 5m benches in 2.5m.

Underground commenced full production in March 2020, three months ahead of schedule, to provide higher grade feed to the plant.

The low grade ore is blended with high grade ore to optimise concentrate grade generation matching the plant capability.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher ....................... Subscription required 1
Cone crusher ....................... Subscription required 2
SAG mill ....................... Subscription required 7.32m x 3.8m 1
Regrind ....................... Subscription required 2

Summary:

Crushing:
- Primary crushing: TEREX JW42-AS849 Jaw Crusher.

Grinding:
- OUTOTEC 7.32m x 3.8m SAG mill;
- Forged steel 125mm balls and 105mm balls.

Screening:
- LUDOWICI UHS-1-1200/300-2 (COF).

Recycle crusher:
- 2 x Sandvik CH420 cone crushers feed size 18 to 150mm.


Processing

  • Filter press plant
  • ACACIA reactor
  • Gravity separation
  • Centrifugal concentrator
  • Flotation
  • Concentrate leach
  • Carbon in leach (CIL)
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Mt Carlton processing plant was commissioned in 2013 and ore is sourced from the V2 gold-copper-silver deposit which is processed on site to produce a concentrate and shipped to China for smelting. The process plant has a current capacity of 840ktpa. Approximately 10-15% of gold feed is recovered through a gravity circuit prior to the flotation circuit to produce dore gold bars which are sold to the ABC Refinery in Sydney. The gravity circuit was installed in 2017 and has lifted recoveries from 88% to 90-91%.

Method: gravity, flotation, regrind.

Equipment: CIL of concentrate

Equipment:
- (Flotation) METSO Rougher circuit 1 x RC rougher cell 40m3, 5 x RV Scavenger cell 40m3;
- Cleaner circuit 3 x rougher cleaner cells 5m3, 6 x Scavenger cleaner cells 5m3;
- 2 x XSTRATA M500 ISA MILL;
- Cyanide supply – Orica;
- Lime supply – Graymont Australia.

Gravity Circuit: Knelson concentrator / Acacia Reactor.

Recoveries & Grades:

CommodityParameter202120202019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required90.590.188.4
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required5.615.335.71

Production:

CommodityUnits202120202019201820172016
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required112,479105,024113,056
Copper t  ......  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.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required746 kt609 kt1,338 kt838 kt
Waste  ......  Subscription required  ......  Subscription required841 kt470 kt3.26 Mt3 Mt
Tonnes processed  ......  Subscription required  ......  Subscription required807 kt801 kt816 kt837 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required840 kt800 kt800 kt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required1.75
Subscription required - Subscription is required.

Reserves at December 31, 2020:
Mineral Resource open pit cut-off 0.35 g/t Au.
Mineral Resource Underground cut-off 2.55 g/t Au. The Mineral Resource for the Mt Carlton A39 underground deposit has been estimated using a AuEq (g/t) cut-off of 4.4g/t.

Ore Reserve open pit cut-off 0.8 g/t Au.
Ore Reserve Underground cut-off 3.2 g/t Au. The Ore Reserve for the Mt Carlton A39 underground deposit has been estimated using a AuEq (g/t) cut-off of 6.1g/t.

CategoryTonnage CommodityGradeContained Metal
Probable 6.43 Mt Gold 0.81 g/t 168 koz
Probable 0.62 Mt Copper 0.74 % 5 kt
Indicated 7.28 Mt Gold 0.86 g/t 201 koz
Indicated 1.58 Mt Copper 0.5 % 8 kt
Inferred 2.24 Mt Gold 2.58 g/t 186 koz
Inferred 1.12 Mt Copper 0.48 % 5 kt
Total Resource 9.53 Mt Gold 1.26 g/t 387 koz
Total Resource 2.69 Mt Copper 0.49 % 13 kt

Commodity Production Costs:

CommodityUnits202120202019201820172016
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required -252 / oz -216 / oz -132 / oz
Cash costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 299 / oz† 307 / oz† 463 / oz†
Cash costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 303 / oz† 308 / oz† 441 / oz†
All-in sustaining costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 535 / oz† 622 / oz† 742 / oz†
All-in costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 735 / oz† 762 / oz† 820 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units202120202019201820172016
Sustaining costs M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required9.9   15.3   13.8  
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required30.9   29.2   21.9  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required214.8   197.1   206.9  
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required136.5   126.1   119.6  
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required139.6  
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2020:
HME TypeModelQuantity
Cable bolter ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Truck (dump) ....................... Subscription required ....................... Subscription required
Truck (dump) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021
Subscription required 2020
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... 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
Fact Sheet 2017
Annual Report 2016
Fact Sheet 2016
Subscription required - Subscription is required.

News:

NewsDate
Navarre Obtains “Outstanding” High-Grade Mt Carlton United Gold Results April 22, 2022
Navarre Minerals Ltd.: Further outstanding high-grade gold results at 100%-owned Crush Creek project February 17, 2022
Navarre completes acquisition of Mt Carlton gold mine December 15, 2021
Evolution Mining Limited: Agreement to divest Mt Carlton gold mine for up to a$90 million October 5, 2021
Evolution sets Mt Carlton up for life extension December 10, 2020
Evolution gives Mt Carlton underground development green light October 11, 2018

Aerial view:

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