Australia

Mount Monger Operation

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Overview

Mine TypeUnderground
StatusActive
Commodities
  • Gold
Mining Method
  • Longhole stoping
  • Longhole open stoping
  • Sub-level stoping
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SnapshotThe three independent and self-sufficient Mining Centres at Mount Monger are the Daisy Complex, Mount Belches and Aldiss Mining Centres. These Mining Centres feed the Randalls processing facility.

Ore mined during the F2023 year was sourced from the Daisy Complex and Tank South underground mines (Aldiss Centres).
Related AssetsAldiss Centre Mine, Daisy Centre Mine, Imperial/Majestic Mine, Mount Belches Centre Mine

Owners

SourceSource
CompanyInterestOwnership
Silver Lake Resources Ltd. 100 % Indirect

Contractors

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Deposit type

  • Orogenic
  • Metamorphic
  • Vein / narrow vein
  • Banded iron formation
  • Porphyry

Summary:

DAISY COMPLEX
The deposit type is classified as an orogenic gold deposit within the Norseman-Wiluna greenstone sequence. The accepted interpretation for gold mineralisation is related to (regional D2-D3) deformation of the stratigraphic sequence during an Archaean orogeny event.

Locally, the mineralisation is characterised as a deformed vein, hosted within intermediate volcanic and volcaniclastic units and closely associated with felsic intrusive rock types of the Gindalbie Terrane. The metamorphic grade is defined as lower green-schist facies.

The Daisy Complex resource extents are 2,600m strike, 840m across strike and 1,440m down dip and open at depth. These extents host approximately 76 known ore zones (ore domains).

MOUNT BELCHES CENTRE
MAXWELLS
The Maxwells deposit is hosted within the lower ‘Maxwells’ member. The Mount Belches group is located in the southern Eastern Goldfields Superterrane, Yilgarn Craton, Western Australia.

The iron formation is a silicate/oxide-facies unit with over printing sulphides, which has undergone metamorphism (upper-greenschist facies) and deformation (two generations of folds). The gold deposits are hosted in both the hinge zone and along the limbs of a regional scale, chevron folded BIF package.

Gold dominantly occurs as inclusions of native gold and/or electrum within or around pyrrhotite, magnetite, and arsenopyrite, and economic mineralisation is typically restricted to the BIF horizons.

The Maxwells resource extent consists of 2020m strike; 440m across strike; and 790m down dip and open at depth.

COCK-EYED BOB
The Cock-eyed Bob is hosted within the upper ‘Santa Clause’ member of the Banded Iron-Formation (BIF) of the Mount Belches group. The Mount Belches group is in the southern Eastern Goldfields Superterrane, Yilgarn Craton, Western Australia.

The iron formation is a silicate/oxide-facies unit with over printing sulphides and has undergone metamorphism (upper-greenschist facies) and deformation (two generations of folds). The gold deposits are hosted in both the hinge zone and along the limbs of a regional scale, chevron folded BIF package.

Gold dominantly occurs as inclusions of native gold and/or electrum within or around pyrrhotite, magnetite, and arsenopyrite, and economic mineralisation is typically restricted to the BIF horizons.

The Cock-Eyed Bob complex’s resource extent consists of 1480m strike; 416m across strike; and 660m down dip and open at depth.

SANTA
The ‘Maxwells’, CEB and ‘Flora Dora’ deposits are hosted within the lower ‘Maxwells’ member of The Mount Belches group and the ‘Santa’ deposit is hosted within the upper ‘Santa’’ member both members are located in the southern Eastern Goldfields Superterrane, Yilgarn Craton, Western Australia.

The iron formation is a silicate/oxide-facies unit with over printing sulfides and has undergone metamorphism (upper-greenschist facies) and deformation (two generations of folds). The gold deposits are hosted in both the hinge zone and along the limbs of a regional scale, chevron folded BIF package.

Gold dominantly occurs as inclusions of native gold and/or electrum within or around pyrrhotite, magnetite and arsenopyrite, and economic mineralisation is typically restricted to the BIF horizons.

The last reported Santa resource model was extended towards south and west to include nearby Flora Dora deposit. The Santa resource extent consists of about 2900m strike; 1300m across strike; and 500m down dip and open a depth.

ALDISS CENTRE
The Aldiss Area gold deposits lie within a north-trending ductile shear zone as Karonie Main and West Zones, Spice, Atreides and Tank. It consists of a series of sheared amphibolite facies, mafic rocks, with remnant veining and late stage faulting. A number of ‘late stage’ porphyries intrude the host rock.

The Karonie resource extent consists of 1600m strike; 500m across strike; and 420m down dip and open at depth.

The Tank Artreides resource extent consists of 1850m strike; 800m across strike; and 325m down dip and open at depth.

The French Kiss Project lies on the eastern margin of the Eastern Goldfields Greenstone Province (EGGP) where Archaean volcano-sedimentary sequences are juxtaposed against granitoid-gneissic terranes. The province is characterised by an interconnecting series of north-north-westerly trending greenstone belts surrounded by ovoid to elongate granitoid batholiths.

The geology of the French Kiss area consists of a sequence of NNW-trending amphibolites and associated metasediments. The rock has a strong metamorphic overprint, generally obliterating the pre-metamorphic textures. The lithologies hosting the French Kiss deposit are mid to upper amphibolite facies and a much higher metamorphic grade than the greenschist facies that is prominent elsewhere in the Eastern Goldfields.

Gold mineralisation occurs almost exclusively within the quartz amphibolites and occurs dominantly as native gold. The habit of the native gold is as coarse interstitial grains, located along hornblende and quartz grain boundaries or included within the hornblende grains.

The French Kiss complex’s resource extent consists of 840m strike; 800m across strike; and 300m down dip and open at depth.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

Milling equipment has not been reported.

Processing

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Production

Open pit mining at Aldiss activities were completed during H1 FY22.
CommodityUnits20232022202120202019201820172016
Gold oz  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe136,767157,936135,837131,109
All production numbers are expressed as metal in doré.

Operational metrics

Metrics20232022202120202019201820172016
Annual processing capacity  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe1.3 Mt1.3 Mt1.3 Mt
Ore tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe1,419,100 t1,269,722 t1,306,508 t1,286,196 t
Tonnes milled  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe1,229,195 t1,256,120 t1,300,152 t1,236,600 t

Production Costs

CommodityUnits20242023202220212020201920182017
Credits (by-product) Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe -3 / oz   -5 / oz   -6 / oz  
All-in sustaining costs (sold) Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,434 / oz **   1,289 / oz **   1,359 / oz **  
^ Guidance / Forecast.
** Net of By-Product.

Financials

Units2023202220212020201920182017
Capital expenditures M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 42.8  
Revenue M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 246.9   255.6   227.5  
EBITDA M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 68   87.9   70  

Heavy Mobile Equipment

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Personnel

Mine Management

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ........... Subscription required ........... Subscription required Subscription required Nov 10, 2023
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