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Australia
Rosebery Mine

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 Location:
191 km NW from Hobart, Tasmania, Australia

  Regional Office:
Level 23 28 Freshwater Place Southbank Victoria
Melbourne
Victoria, Australia
3006
Phone  ...  Subscription required
Fax+61-3-9288-0800
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Copper
  • Gold
  • Silver
Mining Method
  • Longhole open stoping
  • Transverse stoping
  • Longitudinal retreat
  • Cemented backfill
  • Dry waste backfill
Processing
  • Gravity separation
  • Flotation
  • Concentrate leach
  • Solvent Extraction & Electrowinning
Mine Life2023


Owners

Source: p. 1
CompanyInterestOwnership
MMG Ltd. 100 % Direct

Deposit Type

  • VMS


Summary:

The Rosebery volcanogenic massive sulphide (VMS) deposit is hosted within the M t. Read Volcanics, a Cambrian assemblage of lavas, volcaniclastics and sediments deposited in the Dundas Trough between the Proterozoic Rocky Cape Group and the Tyennan Block.

Sulphide mineralisation occurs in stacked stratabound massive to semi-massive base metal sulphide lenses between the Rosebery Thrust Fault and the M t. Black Thrust Fault; the host lithology and the adjoining faults all dip approximately 45 degrees east.

Economic Zn-Pb-Ag-Au mineralisation occurs as massive, semi massive and disseminated base metal sulphide lenses located within the Rosebery host sequence.


Mining Methods

  • Longhole open stoping
  • Transverse stoping
  • Longitudinal retreat
  • Cemented backfill
  • Dry waste backfill


Summary:

Mining production is carried out by long-hole open stoping with a Decline Access. Stoping is conducted through both longitudinal retreat and transverse methods.

Mining lenses are divided into panels and are mined using a bottom-up sequence in a continuous 45 degree retreating either towards or away from level access drives. The nature of this mining sequence causes fluctuations in the grade profile of the short-term schedules. Each stoping panels contain between 3 and 5 sub-levels with crown pillars left in-situ between the backs of up-hole stopes and the lowest sill drive of the panel above.

Backfilling of stope voids is carried out using two methods; Cemented Rock Fill (CRF) and Rock Fill (RF). Up-hole (Crown) retreat stopes are left as an open void due to lack of access for fill placement.

Stope strike lengths of 15m were used in W and X Lens while the other lenses used 20m. The height set to 20-25m (floor to floor) and the minimum mining width of 4.5m. The horizontal width has been adjusted to 4.65m to allow for the low dip of the ore body and to achieve the 4.5 m true widths.

Access to the orebody is through a decline 5.5 mH x 5.5 mW at a 1:7 gradient. The approximate standoff distance between orebody and stoping footwall and major infrastructure; stockpiles, vent rises, escape-ways, declines and ancillary development is 65-70m.


Crushing and Grinding


Processing

  • Gravity separation
  • Flotation
  • Concentrate leach
  • Solvent Extraction & Electrowinning

Flow Sheet: Subscription required

Summary:

The Rosebery crushing circuit consists of a Primary Jaw Crusher and a Secondary Cone Crusher. During Crushing the ore size is reduced from around 650mm to P80 of 20mm. The Grinding Circuit consists of 2 x Primary Ball Mills and 3 x Secondary Ball Mills.

Gravity gold is recovered from the grinding circuits using 2x Knelson Concentrators. Gold Concentrates are leached in an Intensive Leach Reactor (ILR). Then recovered from the pregnant leach solution by electrowinning and thereafter the gold sludge is smelted.

The recovery sequence for sulphide minerals in the Flotation Circuit is Chalcopyrite (Cu), Galena (Pb), Sphalerite (Zn). Payable gold and silver is recovered with the copper and lead concentrates.

Recoveries & Grades:

CommodityParameter20192018201720162015
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Head Grade, % 9.458.78.98.311.2
Zinc Concentrate Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Head Grade, % 3.13.53.22.92.9
Lead Concentrate Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Head Grade, % 0.240.20.20.30.5
Copper Concentrate Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 1.31.51.41.41.7
Silver Head Grade, g/t 103.6130.8112.39893.4
Subscription required - Subscription is required.

Production:

CommodityProductUnits202020192018201720162015
Zinc Metal in concentrate t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required74,80381,44792,104
Zinc Concentrate t  ......  Subscription required  ......  Subscription required134,874145,294168,387
Lead Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in dorĂ© oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in dorĂ© oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required931,573 t897,516 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required939,125 t898,573 t
Plant annual capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1 Mt
Subscription required - Subscription is required.

Reserves at June 30, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 4.7 Mt Zinc 7.3 % 345 kt
Proven & Probable 4.7 Mt Lead 2.7 % 9 kt
Proven & Probable 4.7 Mt Copper 0.2 % 127 kt
Proven & Probable 4.7 Mt Gold 1.3 g/t 0.2 M oz
Proven & Probable 4.7 Mt Silver 104 g/t 15.9 M oz
Total Resource 16.6 Mt Zinc 8.3 % 1,377 kt
Total Resource 16.6 Mt Lead 2.9 % 475 kt
Total Resource 16.6 Mt Copper 0.25 % 42 kt
Total Resource 16.6 Mt Gold 1.4 g/t 0.7 M oz
Total Resource 16.6 Mt Silver 102 g/t 52.4 M oz

Commodity Production Costs:

CommodityUnits202020192018201720162015
C1 cash costs Zinc USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 0.07 / lb† 0.12 / lb† 0.3 / lb†
^ 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


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 21, 2020
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required 2018
Subscription required Subscription required Subscription required 2017
Subscription required Subscription required Subscription required 2015

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
Sustainability Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Other 2016
Year-end Mineral Reserves 2016
Fact Sheet 2015
Other 2015
Project Description 2015
Subscription required - Subscription is required.

Aerial view:

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