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Australia
Dugald River Mine

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 Location:
63 km NW from Cloncurry, Queensland, Australia

  Address:
Dugald River Mine, Burke Development Road
Cloncurry
Queensland, Australia
4824
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Silver
  • Copper
  • Gold
Mining Method
  • Longitudinal open stoping
  • Sub-level open stoping (SLOS)
  • Transverse open stoping
  • Avoca
  • Paste backfill
Production Start...
Mine Life20 years (as of Jan 1, 2021)
Dugald River is one of the world’s top 10 zinc operations.


Owners

Source: p. 30, 148,198
CompanyInterestOwnership
MMG Ltd. 100 % Indirect
The Dugald River mine is an underground zinc-leadsilver deposit and a wholly owned by a subsidiary of MMG Limited. MMG Dugald River Pty Ltd, a wholly owned subsidiary of the MMG Limited.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Breccia pipe / Stockwork
  • Sediment-hosted


Summary:

The Dugald River style of mineralisation is a sedimentary and shear hosted base metal deposit. The main sulphides are sphalerite, pyrite, pyrrhotite and galena with minor arsenopyrite, chalcopyrite, tetrahedrite, pyrargyrite, marcasite and alabandite. The deposit is located within a 3km-4km along strike north-south trending high strain domain named the Mount Roseby Corridor and is hosted by steeply dipping mid Proterozoic sediments of the Mary Kathleen Zone in the Eastern Succession of the Mount Isa Inlier. The host sequence is composed of the Knapdale Quartzite and the Mount Roseby Schist Group (which includes the Hangingwall calc-silicate unit, the Dugald River Slate and the Lady Clayre Dolomite). The sequence is an interbedded package of greenschist to amphibolite grade metamorphosed carbonate and siliclastic lithologies. The main Dugald River lode is hosted within a major N-S striking steeply west dipping shear zone which cross cuts the strike of the Dugald River Slate stratigraphy at a low angle. All significant zinc-lead-silver mineralisation is restricted to the main lode. Lesser-mineralised hanging wall and footwall lenses are present. Three main mineralisation textures/types are recognised, including banded, slatey breccia, and massive breccia. The geometry of the deposit consists of the boudinaged main lens, which pinches and swells in thickness along strike and to depth. It is recognised that the previously modelled hangingwall and footwall domains (1A, 2, 3, 4 ........


Mining Methods

  • Longitudinal open stoping
  • Sub-level open stoping (SLOS)
  • Transverse open stoping
  • Avoca
  • Paste backfill


Summary:

Mining at Dugald River is planned to be underground with the long-hole open stoping method favoured. Currently the deposit is accessed by two declines.

The orebody access is split into a north and south mine, due to its 2 km strike length and a low-grade zone at the extremities of the orebody.

The north mine is narrow (average ~5 m true width) and sub-vertical. The south mine is wider than the north mine with a flexural zone in the centre. The south mine is narrow and steep in the upper zone (~top 200 m from surface) and lower zone (~below 700 m from surface). The central zone is flatter and thicker than the upper and lower zones.

Mining methods for the mine are Sub-Level Open Stopes (SLOS) both Longitudinal and Transverse in the South Mine and modified Avoca stoping or Core & Shell stopes with rib pillars in the North Mine. Level intervals occur every 25m and stopes have a strike length of 15m.

The stopes are broken into the following categories:
- Longitudinal SLOS, for stopes upto 10-15m wide horizontally. (Where the orebody has thickened adjacent stopes are mined in sequence after paste filling);
- Transverse SLOS, for stopes where the orebody thickness lends itself to sequential stope extraction retreating along cross-cuts;
- Crown pillar SLOS, for the top level of each panel where stoping occurs directly below a previously mined area;
- Modified Avoca stopes/Core & Shell Stopes for the North Mine.


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits20222021202020192018
Zinc Metal in concentrate t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required147,320
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required293
Lead Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Payable metal oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2021202020192018
Ore tonnes mined  ......  Subscription required  ......  Subscription required1,853,876 t1,473,804 t
Tonnes milled  ......  Subscription required  ......  Subscription required1,975,569 t1,755,847 t
Annual milling capacity  ......  Subscription required  ......  Subscription required1.7 Mt
Subscription required - Subscription is required.

Reserves at June 30, 2021:
The 2021 Mineral Resource has been reported above an A$142/t NSR (net smelter return) cut-off.

Mineral Reserve cut-off grade is based on Net Smelter Return (NSR) after Royalties, expressed as a dollar value ($A) of dependant on the area of the mine ranging from $A130/t to $A150/t.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 24 Mt Zinc 10.6 % 2,500 kt
Proven & Probable 24 Mt Lead 1.7 % 410 kt
Proven & Probable 24 Mt Silver 44 g/t 33 M oz
Inferred 4.5 Mt Copper 1.5 % 68 kt
Inferred 4.5 Mt Gold 0.1 g/t 0.02 M oz
Total Resource 66 Mt Zinc 11.7 % 7,700 kt
Total Resource 66 Mt Lead 1.3 % 830 kt
Total Resource 66 Mt Silver 26 g/t 55 M oz

Commodity Production Costs:

CommodityUnits20222021202020192018
C1 cash costs Zinc USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 0.58 / lb†  
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2021202020192018
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 247.3  
EBIT M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 46.9  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 87.6  
Subscription required - Subscription is required



Heavy Mobile Equipment:
HME TypeModelSizeQuantityLeased or
Contractor
Ref. Date
Cable bolter ....................... Subscription required Leased Jun 30, 2021
Drill (long hole) ....................... Subscription required ....................... Subscription required Dec 22, 2022
Drill jumbo (two boom) ....................... Subscription required Leased Jun 30, 2021
Loader ....................... Subscription required Leased Jun 30, 2021
Loader - Tool Carrier ....................... Subscription required Leased Jun 30, 2021
Shotcreter ....................... Subscription required Leased Jun 30, 2021
Trans Mixer ....................... Subscription required Leased Jun 30, 2021
Truck (dump) ....................... Subscription required Leased Jun 30, 2021
Truck (underground) ....................... Subscription required 63 t ....................... Subscription required Dec 22, 2022
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 14, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Other 2022
................................... 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
................................... Subscription required 2019
Quarterly Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Quarterly Report 2017
Year-end Mineral Reserves 2017
Corporate Presentation 2015
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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