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Australia
Lady Loretta Mine (Mount Isa Zinc Operation)

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 Location:
114 km NW from Mount Isa, Queensland, Australia

  Address:
Private Mail Bag 6
Mount Isa
Queensland, Australia
4825
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Silver
Mining Method
  • Blast Hole Stoping
Processing
  • Flotation
The mine was placed on care and maintenance during the last quarter of 2015. Mine production at Lady Loretta restarted in 2018.


Owners

 
CompanyInterestOwnership
Glencore plc. 100 % Indirect
Mount Isa Mines Ltd. 100 % Direct

Deposit Type

  • SEDEX


Summary:

Lead-zinc-silver mineralisation occurs in a galena and sphalerite rich massive sulphide lens located in carbonaceous pyritic shales and siltstones. The deposit consists of a tight syncline dislocated by a number of major faults. The deeper and high grade portion of the deposit reaches 500m below the surface.


Mining Methods

  • Blast Hole Stoping


Summary:

Drilling and blasting practices are conducted at underground operations to fragment the rock surrounding the ore. Ore from underground is mucked, crushed and hauled to the surface.

Blasthole stoping is used at Lady Loretta.


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

Ore mined is roughly crushed on site, then trucked to the Mount Isa mills for processing. When it reaches the processing plant it is blended with ore mined at the Handlebar Hill open cut, the Black Star open cut and the George Fisher underground mine.

First, the ore is ground into a fine dust via a series of ball mills. This dust is then mixed with water and reagents in our zinc-lead concentrator’s flotation circuit. The reagents help us to separate the valuable mineral content from waste rock. Air is forced through the slurry creating bubbles, which float to the surface and attract and bind to the zinc or lead particles. The glossy, mineral-laden “froth” is then skimmed off the top and dried. What remains once the water content of the froth has evaporated is zinc or lead concentrate. Our zinc concentrates are sold in the domestic market and exported overseas, while our lead concentrate undergoes further processing and smelting on site to become crude lead, or lead bullion.< ........


Combined production numbers are reported under Mount Isa Zinc Operation

Operational Metrics:

Metrics2018
Ore tonnes mined  ......  Subscription required
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Reserves at December 31, 2018:

CategoryTonnage CommodityGrade
Proven 4.7 Mt Zinc 12.6 %
Proven 4.7 Mt Lead 5.2 %
Proven 4.7 Mt Silver 79 g/t
Probable 2.7 Mt Zinc 12.1 %
Probable 2.7 Mt Lead 3.8 %
Probable 2.7 Mt Silver 71 g/t
Proven & Probable 7.4 Mt Zinc 12.5 %
Proven & Probable 7.4 Mt Lead 4.7 %
Proven & Probable 7.4 Mt Silver 76 g/t
Measured 4.6 Mt Zinc 16.3 %
Measured 4.6 Mt Lead 6.3 %
Measured 4.6 Mt Silver 96 g/t
Indicated 3.7 Mt Zinc 15.1 %
Indicated 3.7 Mt Lead 5 %
Indicated 3.7 Mt Silver 87 g/t
Measured & Indicated 8.3 Mt Zinc 15.7 %
Measured & Indicated 8.3 Mt Lead 5.7 %
Measured & Indicated 8.3 Mt Silver 92 g/t


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2018
Year-end Mineral Reserves 2017
Corporate Presentation 2016
Year-end Mineral Reserves 2016
Other 1995
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Aerial view:

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