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Australia
Cosmo Mine

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 Location:
59 km NW from Pine Creek, Northern Territory, Australia

  Regional Office:
PO Box 469, 13 Sheperd Street, Unit 2
Darwin
Northern Territory, Australia
0801
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Cut & Fill
  • Open stoping
  • Cemented backfill
The Company’s business portfolio also includes assets in the Northern Territory of Australia. These assets, which are comprised of the Cosmo mine (“Cosmo”), Union Reefs mill (“Union Reefs”) as well as a number of exploration properties, are also currently on care and maintenance.


Owners

Source: p. 1
CompanyInterestOwnership
Agnico Eagle Mines Ltd. 100 % Indirect
NT Mining Operations Pty Ltd. (operator) 100 % Direct
February 8, 2022 – Agnico Eagle Mines Limited and Kirkland Lake Gold Ltd. are pleased to announce the successful completion of the previously announced merger of equals transaction (the “Merger”).

The combined company will continue as Agnico Eagle Mines Limited.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Orogenic


Summary:

A variety of genetic models, ranging from magmatic through hydrothermal to syngenetic, have been postulated in the past for the formation of gold deposits in the Pine Creek Geosyncline. Gold and base metal mineralization in the Pine Creek Geosyncline is commonly associated with granite intrusions and have often been classified as high temperature contact aureole deposits. A secondary host rock control has also been suggested due to the association of gold mineralization with carbonaceous metasedimentary rocks, such as at Cosmo Mine.

Native gold is the main mineralization mineral and is commonly present as micron sized grains; coarse nuggets are rare. Gold is commonly associated with pyrite, arsenopyrite and pyrrhotite and in places with minor base metal sulphides. Quartz, chlorite, sericite and carbonates are the common gangue minerals in the gold-quartz deposits.

All gold deposits in the Northern Territory show some structural control at the regional and deposit scales, with most deposits within the Pine Creek Orogen trending northwest southeast.

Base metal mineralization in the Pine Creek Orogen strike significantly differently than the gold veins, suggesting different discrete mineralizing events. They are syngenetic.

Cosmo gold mineralization is hosted across a stratigraphic sequence (‘Cosmo Mine Sequence”) that lies between a major dolerite sill (‘Zamu’ dolerite unit) and a thick package of high sulfide, graphitic mudstone (‘Pm ........


Mining Methods

  • Cut & Fill
  • Open stoping
  • Cemented backfill


Summary:

The Company is currently mining the Cosmo Deposit as an underground mine at a current depth of 600mRL. The Cosmo workings are accessed via a decline commencing from the southern wall of the Cosmo open pit. The mining activity at Cosmo has progressed from the Eastern Lodes utilizing Avoca-style cut and fill stoping to the Hinge Zone and Western Lodes where uphole open stoping is employed.

Ore was previously mined by a combination of Modified Avoca and Long-hole Open Stoping when isolated stopes were extracted. Mining is now focused on the Hinge Zone and Western Lodes where the uphole open stoping will speed up access to stope ore as upper stopes will be mined without the requirement to backfill.

Uphole Open Stoping is sequenced from the top down. As soon as the drill drive is completed, Stope development can begin. Rib pillars are left at intervals along the length of each panel to support the hangingwall without the requirement of back filling. Sill pillars are not required to regulate stope development. All underground production mineralization is trucked via the decline to the surface ROM stockpile adjacent to the Cosmo open pit. Mineralization is then loaded into on-highway haul trucks to be transported 67km to the Union Reefs processing plant.

Development waste is used for stope backfill as dictated by the production schedule. Waste not immediately required for backfill is typically stockpiled underground close to stope backfill location ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits20172016
Gold oz 20,59555,764
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics20172016
Tonnes milled 259,729 t646,848 t
Annual mining capacity 2 Mt

Reserves at December 31, 2020:
Northern Territory Open Pit Mineral Resources were estimated using a cut-off grade of 0.5 g/t Au.
Northern Territory Underground Mineral Resources were estimated using a cut-off grades ranging between 1.5 g/t Au and 2.0 g/t Au.

CategoryTonnage CommodityGradeContained Metal
Measured & Indicated 25,200 kt Gold 2.3 g/t 1,830 koz
Inferred 19,200 kt Gold 2.3 g/t 1,390 koz

Commodity Production Costs:

CommodityUnits20172016
Cash costs (sold) Gold USD 1,661 / oz   1,048 / oz  
All-in sustaining costs (sold) Gold USD 1,996 / oz   1,173 / oz  

Financials:

Units20172016
Capital expenditures M USD 7.5   0.6  
Revenue M USD 27.4   7.7  
Operating Income M USD -33.5   -1.3  
Pre-tax Income M USD -1.3  
After-tax Income M USD -1.3  



Heavy Mobile Equipment as of December 31, 2016:
HME TypeModelQuantity
Concrete sprayer ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Truck (dump) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 6, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Press Release 2022
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Management Discussion & Analysis 2018
Financial Review 2017
Management Discussion & Analysis 2017
Corporate Presentation 2016
Corporate Presentation 2016
Financial Review 2016
Management Discussion & Analysis 2016
Technical Report 2016
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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