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Australia
Rosebery Mine

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 Location:
191 km NW from Hobart, Tasmania, Australia

  Regional Office:
Hospital Road
PO Box 21
Rosebery
Tasmania, Australia
7470
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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
Production Start...
Mine Life2023
Resource extension and near-mine exploration continue, with results indicating further extensions to the resource and mine life. As a result, MMG Ltd. is currently investigating the potential for short-term capacity increases at existing tailings storage facilities while studying and permitting a proposed site for a new tailings storage facility to support an extended life of mine.


Owners

Source: p. 33,148, 198
CompanyInterestOwnership
MMG Ltd. 100 % Indirect

Contractors

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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. The Rosebery mineral deposit extends from 400mE to 1800mE, 2800mN to -1100mN, 3400mRL-1800mRL (Rosebery Mine grid co-ordinates) and is currently open to the north, south and at depth. Individual lenses vary in size from a few hundred metres up to 1000m along strike and/or down-dip.


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.

Average 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.

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.

The primary ventilation system supplies approximately 660 m³/s (measured at depth) of air to the underground mine, which is sufficient to allow extraction from multiple ore lenses.


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityProductUnits2022202120202019201820172016
Zinc Metal in concentrate t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required75,72174,80381,447
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required140135145
Lead Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Concentrate kt  ......  Subscription required  ......  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  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in doré oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate oz  ......  Subscription required
Silver Metal in doré oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate oz  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required1,032,508 t1,017,089 t990,813 t931,573 t
Tonnes milled  ......  Subscription required  ......  Subscription required1,030,016 t1,028,234 t968,573 t939,125 t
Plant annual capacity  ......  Subscription required  ......  Subscription required1 Mt
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Reserves at June 30, 2021:
Rosebery Mineral Resources and Ore Reserves cut-off grade are based on Net Smelter Return (NSR), expressed as a dollar value of A$174/t.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 6.1 Mt Zinc 6.3 % 380 kt
Proven & Probable 6.1 Mt Lead 2.5 % 150 kt
Proven & Probable 6.1 Mt Copper 0.19 % 11 kt
Proven & Probable 6.1 Mt Gold 1.2 g/t 0.24 M oz
Proven & Probable 6.1 Mt Silver 120 g/t 23 M oz
Total Resource 17 Mt Zinc 7.9 % 1,300 kt
Total Resource 17 Mt Lead 2.6 % 440 kt
Total Resource 17 Mt Copper 0.21 % 34 kt
Total Resource 17 Mt Gold 1.3 g/t 0.68 M oz
Total Resource 17 Mt Silver 110 g/t 61 M oz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
C1 cash costs Zinc USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† -0.04 / lb†   0.07 / lb†   0.12 / lb†  
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2021202020192018
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 328.7  
EBIT M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 97.8  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 171.6  
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Heavy Mobile Equipment:

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Jun 9, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 9, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 9, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 9, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 9, 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 2018
Subscription required Subscription required Subscription required 2017
Subscription required Subscription required Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... 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 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Quarterly Report 2018
Year-end Mineral Reserves 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
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