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Australia
Dugald River Mine

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 Location:
63 km NW from Cloncurry, Queensland, Australia

  Address:
00 Dugald River Mine, Burke Development Road
Cloncurry
Queensland, Australia
4824
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Sales
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Silver
  • Copper
  • Gold
Mining Method
  • Sub-level stoping
  • Avoca
  • Paste backfill
Processing
  • Flotation
Mine Life25 years (as of Jan 1, 2017)
Dugald River recorded an US$88.7 million increase in revenue for 2019. This reflected sales for a full year, compared to eight months in 2018, with Dugald River achieving commercial production on 1 May 2018.
Latest NewsMMG performance propped up by Dugald River mine     August 21, 2018


Owners & OPERATOR

Source: p. 143
CompanyInterestOwnership
MMG Ltd. 100 % Indirect
MMG Dugald River Pty. Ltd. (operator) 100 % Direct

Deposit Type

  • Breccia pipe / Stockwork
  • Sedimentary


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 mineralogy of the Dugald River lode is typical of a shale-hosted base metal deposit. The gangue within the lode is composed of quartz, muscovite, carbonates, K-Feldspar, clays, graphite, carbonaceous matter and minor amounts of calcite, albite, chlorite, rutile, barite, garnet, and fluorite.

The mineralised zone extends approximately 2.4km in strike length and up to 1.4km down-dip.


Mining Methods

  • Sub-level stoping
  • Avoca
  • Paste backfill


Summary:

The orebody 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) in the South Mine and modified Avoca stoping or Core & Shell stopes with rib pillars in the North Mine with a 25m level interval and variable stope strike length of 15 m to 30m.

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).
- 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.

Fill Dilution and Stope Recovery Factors:
- Floor 0.15 m, Backs 0.5 m and Wall fill ranges from 1 m to 1.5 m dilution.
- Recoveries Longitudinal 95%, Modified AVOCA / Core & Shell with rib pillars 75% and Crown stopes 90%.

The underground (UG) mine is accessed via two separate declines. The mine is split into two – north and south, though both declines are connected via a link drive approximately every 150m vertically -the base of each production Panel. As at 30 June 2019, 7,577m of decline is in place, along with a further 45,810 m of lateral development.


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

The metallurgy process proposed for the Dugald River deposit involves crushing and grinding followed by floatation and filtration to produce separate zinc and lead concentrates for sale.

Deleterious elements include manganese and carbon, which have been estimated in the block model. Manganese percentage in the zinc concentrate is calculated as a postprocessing
step to allow the generation of a value that can be used for the Ore Reserves.

Recoveries & Grades:

CommodityParameter20192018
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required
Zinc Head Grade, % 10.210.1
Zinc Concentrate Grade, %  ......  Subscription required  ......  Subscription required
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required
Lead Head Grade, % 1.761.8
Lead Concentrate Grade, %  ......  Subscription required  ......  Subscription required
Silver Head Grade, 5650.7
Subscription required - Subscription is required.

Production:

CommodityProductUnits202020192018
Zinc Metal in concentrate t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required
Zinc Concentrate t  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate t  ......  Subscription required  ......  Subscription required
Lead Concentrate t  ......  Subscription required  ......  Subscription required
Silver Payable metal oz  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018
Ore tonnes mined  ......  Subscription required  ......  Subscription required
Tonnes milled  ......  Subscription required  ......  Subscription required
Annual milling capacity  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at June 30, 2019:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Stockpiles 0.1 Mt Zinc 10.8 % 9 kt
Proven In-Situ (UG) 11.7 Mt Zinc 10.9 % 1,281 kt
Proven Stockpiles 0.1 Mt Lead 1.8 % 1 kt
Proven In-Situ (UG) 11.7 Mt Lead 2 % 231 kt
Proven Stockpiles 0.1 Mt Silver 53 g/t 0.1 M oz
Proven In-Situ (UG) 11.7 Mt Silver 57 g/t 21 M oz
Probable In-Situ (UG) 14.1 Mt Zinc 11.1 % 1,565 kt
Probable In-Situ (UG) 14.1 Mt Lead 1.5 % 211 kt
Probable In-Situ (UG) 14.1 Mt Silver 18 g/t 8 M oz
Proven & Probable Stockpiles 0.1 Mt Zinc 10.8 % 9 kt
Proven & Probable In-Situ (UG) 25.9 Mt Zinc 11 % 2,845 kt
Proven & Probable Total 25.9 Mt Zinc 11 % 2,854 kt
Proven & Probable Stockpiles 0.1 Mt Lead 1.8 % 1 kt
Proven & Probable In-Situ (UG) 25.9 Mt Lead 1.7 % 442 kt
Proven & Probable Total 25.9 Mt Lead 1.7 % 443 kt
Proven & Probable Stockpiles 0.1 Mt Silver 53 g/t 0.1 M oz
Proven & Probable In-Situ (UG) 25.9 Mt Silver 36 g/t 30 M oz
Proven & Probable Total 25.9 Mt Silver 36 g/t 30 M oz
Measured Stockpiles 0.1 Mt Zinc 10.8 % 9 kt
Measured In-Situ (UG) 12.9 Mt Zinc 13.1 % 1,685 kt
Measured Stockpiles 0.1 Mt Lead 1.8 % 1.5 kt
Measured In-Situ (UG) 12.9 Mt Lead 2.3 % 301 kt
Measured Stockpiles 0.1 Mt Silver 53 g/t 0.1 M oz
Measured In-Situ (UG) 12.9 Mt Silver 69 g/t 29 M oz
Indicated In-Situ (UG) 21 Mt Zinc 12.3 % 2,566 kt
Indicated In-Situ (UG) 21 Mt Lead 1.6 % 334 kt
Indicated In-Situ (UG) 21 Mt Silver 23 g/t 15 M oz
Inferred In-Situ (UG) 26 Mt Zinc 11.7 % 2,979 kt
Inferred In-Situ (UG) 26 Mt Lead 1.2 % 316 kt
Inferred In-Situ (UG) 26 Mt Silver 7 g/t 6 M oz
Inferred In-Situ (UG) 8.7 Mt Copper 1.6 % 136 kt
Inferred In-Situ (UG) 8.7 Mt Gold 0.2 g/t 0.06 M oz

Commodity Production Costs:

CommodityUnits202020192018
C1 cash costs Zinc USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units20192018
Revenue M USD  ......  Subscription required  ......  Subscription required
EBIT M USD  ......  Subscription required  ......  Subscription required
EBITDA M USD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Proposed Heavy Mobile Equipment as of June 30, 2019:
HME TypeQuantity
Cable bolter 1
....................... Subscription required 3
....................... Subscription required 3
....................... Subscription required 6
....................... Subscription required 2
....................... Subscription required 2
....................... Subscription required 9
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 15, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 15, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 15, 2020
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2020
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Quarterly Report 2017
Year-end Mineral Reserves 2017
Subscription required - Subscription is required.

News:

NewsDate
MMG performance propped up by Dugald River mine August 21, 2018

Aerial view:

Subscription required - Subscription is required.

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