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Australia
Mount Isa Zinc Operation (George Fisher Mine, Lady Loretta Mine)

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 Location:
1 km W from Mount Isa, Queensland, Australia

  Address:
Private Mail Bag 6
Mount Isa
Queensland, Australia
4825
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WebsiteWeb
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Silver
Mining Method
  • Sub-level open stoping (SLOS)
  • Paste backfill
Production Start...
Mine Life18 years (as of Jan 1, 2021)
Mount Isa Mines is one of the world's largest mining complexes.
The company's zinc assets in and around Mount Isa consist of George Fisher underground mine, and Lady Loretta underground mine located 140 kilometres north-west of Mount Isa and operated by Redpath Australia.


Owners

Source: p. 17
CompanyInterestOwnership
Glencore plc. 100 % Indirect

Contractors

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Deposit Type

  • Breccia pipe / Stockwork


Summary:

The Zn-Pb-Ag bodies are too numerous to list their dimensions in detail. As examples:
• 5 Orebody has a strike length of approximately 2000 metres, a width of up to 35m metres, and a vertical extent of approximately 1000 metres;
• 12 orebody has a length of approximately 1500m, a width of approximately 10 metres, and a vertical extent of approximately 1000 metres.

Pb-Zn-Ag orebodies at Mount Isa are broadly stratiform with a 60-65° westerly dip parallel to bedding in the host Urquhart Shale. The main stacked group of orebodies defines and en-echelon group of north-plunging lenses which are bounded to the south by the silica-dolomite alteration zone associated with the copper orebodies and to the north by the NNW-plunging Mount Isa Fold (Davis 2004).

The stratiform zone of Zn-Pb-Ag and pyrite enrichment within the Urquhart Shale is much more laterally extensive than the economically-defined orebodies (Painter, 2003), extending along stratigraphically consistent zones for more than 10km north of the economic limit of mineralisation.

Mount Isa’s stratiform silver-leadzinc sulphide mineralization occurs with pyrite and pyrrhotite in distinct bands dipping to the west, concordant with weakly bedded carbonaceous dolomitic sediments of the Urquhart Shale. The mineralization is intermittent through a stratigraphic interval of over 1 km, but the major orebodies are restricted to the upper 650 m. The orebodies occur in an echelon pattern, int ........


Mining Methods

  • Sub-level open stoping (SLOS)
  • Paste backfill


Summary:

Mt Isa zinc assets involve the 4.5 million tonne per annum George Fisher underground mine and the 1.6 million tonne per annum Lady Loretta underground mine, which is operated by RedPath Australia. The Black Star open cut was moved to a care and maintenance phase during the last quarter of 2016 after mining out the existing reserves.

The George Fisher mine was officially opened in 2000. A feasibility project was conducted from 2009 to 2014 installing a new materials handling system and opening up a new mining block down to 1,160 metres at the Northern end of the George Fisher orebody with the capacity to increase production to 4.5 million tonnes of ore per annum.

The current extraction method at George Fisher is sublevel open stoping.

The high-grade Lady Loretta zinc mine is located 110 kilometres northwest of Mount Isa. Production began in 2013 and the mine was placed on care and maintenance in 2015 before its restart in March 2018. Redpath operates the mine with a workforce of 227 people. With a nameplate annual ore capacity of 1.6 million tonnes, Lady Loretta can produce as many as 160,000 tonnes of zinc per year over its remaining six-year mine life.

The mining method utilized at Lady Loretta is conventional sub-level open stoping (a slot is opened up using a Redbore 30 raisebore raise drill) with paste used to fill the void upon completion. The Mining Lease, ML5568, is current until January 31st, 2026.

The current ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits202120202019201820172016
Zinc kt  ......  Subscription required  ......  Subscription required  ......  Subscription required278226288
Lead kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate.
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Reserves at December 31, 2021:

CategoryTonnage CommodityGrade
Proven & Probable 68 Mt Zinc 7.5 %
Proven & Probable 68 Mt Lead 3.6 %
Proven & Probable 68 Mt Silver 63 g/t
Measured & Indicated 393 Mt Zinc 6.9 %
Measured & Indicated 393 Mt Lead 3.5 %
Measured & Indicated 393 Mt Silver 69 g/t
Inferred 286 Mt Zinc 5 %
Inferred 286 Mt Lead 2 %
Inferred 286 Mt Silver 48 g/t



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
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Staff:

Total WorkforceYear
Subscription required 2020
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
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................................... Subscription required 2019
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Annual Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Other 1995
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