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Australia

Mungari Operation

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Overview

Mine TypeOpen Pit & Underground
StatusActive
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Longhole open stoping
  • Open stoping
Backfill type ... Lock
Mine Life... Lock
SnapshotThe operation consists of the Frog’s Leg, East Kundana and Kundana underground mines, the Cutter’s Ridge open pit mine, and the Mungari 2Mtpa carbon-in-leach processing plant.

The Mungari 4.2 project (previously known as the Mungari Future Growth Project)
In 2023, the Board approved capital investment of $250 million for the Mungari plant expansion from 2 million tonnes to 4.2 million tonnes per annum following completion of the Mungari Future Growth Feasibility Study (released on June 5, 2023).

Planning is well progressed, including initial engineering design and procurement works have commenced. Site works are expected to commence in mid-January 2024. The project has an estimated 30-month construction period including long-lead items and approvals, with commissioning expected by the end of the March 2026 quarter.
Related AssetsCastle Hill Project, East Kundana (EKJV) Mine, Frog’s Leg Mine, Kundana (Millennium) Mine, White Foil and Cutters Ridge Mine

Owners

SourceSource
CompanyInterestOwnership
Evolution Mining Ltd. 100 % Indirect
Evolution Mining Mungari Pty Ltd. (operator) 100 % Direct
Evolution operates wholly-owned mine Mungari in Western Australia.

Contractors

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Deposit type

  • Breccia pipe / Stockwork
  • Vein / narrow vein

Summary:

The Mungari Operation lies within the Kalgoorlie Terrane of the Wiluna-Norseman Greenstone Belt, part of the greater Archaean Yilgarn Craton of Western Australia. The geology is varied over the greater Mungari Operations project area and can be broken up into three broad geological camps being the: • Kundana Gold Camp; • Carbine Gold Camp; and • Kunanalling Gold Camp. The White Foil, Cutters Ridge and Frog’s Leg deposits are situated within the Norseman-Wiluna Greenstone Belt of the Yilgarn Craton, Western Australia. White Foil lies three kilometres to the west of the Zuleika Shear, a regional scale shear zone, and is hosted within a quartz rich gabbro unit which is part of the Powder Sill intrusive complex. The mineralised zone is 70m wide, 400m long and dips to the WSW and WNS at between 50° to 60° and is open at depth The Kundana deposits are hosted by a structurally prepared sequence of sediments, volcaniclastics, mafic and ultramafic volcanic and intrusive rocks typical of the greenstone sequences in the Archaean Yilgarn Block. The deposits are spatially associated with the craton-scale Zuleika Shear Zone. The Zuleika Shear Zone represents the boundary between the Coolgardie domain to the west and the Ora Banda domain to the east. Lithologies at the Carbine-Zuleika Project consist of a series of feldspathic to quartzo-feldspathic tuffs intercalated with shales, siltstones, and sandstones. The Zuleika Shear Zone is the major structural element of the area. The two major mineralised planes in the Carbine area, the Carbine thrust and Lincancabur shear, host brecciated and laminated veins respectively, with high-grade gold mineralisation. The Kunanalling project area covers the Kunanalling Shear Zone (KSZ) which is a trans-crustal feature separating the Coolgardie domain from the Ora Banda domain to the east. The Coolgardie domain comprises a folded sequence of metamorphosed tholeiitic, high magnesian, and komatiitic basalts with minor intercalated felsic to intermediate volcanic sediments. Gold mineralisation within the Kunanalling area is hosted by the Coolgardie Domain and is preferentially located in areas of high strain associated with the Zuleika and Kunanalling Shears. The Zuleika Shear Zone, Kunnanalling Shear Zone and Carbine Thrust Zone are the dominant corridors of mineralisation at Mungari. The Zuleika Shear Zone is the major structural element of the area. It is a suite of anastomosing sub-parallel shears that together comprise a major terrane-scale structure. The Zuileika Shear Zone hosts many of the active mines at Mungari including Frogs Legs, East Kundana Joint Venture and Kundana Underground. Two major mineralised shears within the zone have been identified as the Strzelecki and K2 shears with high-grade gold mineralisation which host laminated quartz veins. The Carbine Thrust corridor intersects the Zuleika Shear in the north of the tenement package. The Carbine Zuleika area geology is predominantly a sedimentary sequence known as The Black Flag Group containing volcaniclastic and deep marine sediments. The two major mineralised planes in the Carbine area, the Carbine thrust and Lincancabur Fault, host brecciated and laminated veins respectively, with high-grade gold mineralisation. The Carbine and Phantom deposits are associated with the Carbine Thrust, while the Paradigm deposit is hosted on the Fault. Mineralisation related to the Carbine Thrust is typically observed as brecciated, coarse crystalline veins and laminated veins similar to those seen in the Zuleika Shear Zone observed in the Lincancabur Fault. The Anthill deposit lies to the east of Paradigm on the Zuleika Sheer mineralisation is defined as stockwork veining in an altered pillow basalt. The Kunanalling Shear Zone also hosts significant gold mineralisation with Cutters Ridge being mined currently and advanced projects including Rajax, Castle Hill and Kintore. The Kunanalling Shear Zone (KSZ) is a trans crustal feature that cuts through anticlinal fold hinges in the Coolgardie North region. The area has been intruded by conformable syntectonic dolerites, gabbros and stocks of monzogranitic, tonalitic, and granodioritic composition. Gold mineralisation is hosted in areas of high strain and in and around felsic intrusives. Mineralisation and alteration models were constructed based on geological logging of drill holes and geological mapping. Mineralisation is characterised as orogenic, narrow vein gold deposits and, mineralised alteration envelopes, stockworks and mineralised intrusives and supergene enrichment horizons. Orogenic, narrow vein gold mineralisation is typically hosted within brittle (extension vein arrays and breccias), brittle-ductile (laminated veins) and ductile (shear zones) structural zones and typically exhibit a sodic and potassic alteration assemblage, proximal to the structure. Alteration minerals include; sericite epidote, chlorite and albite, muscovite and biotite. Gold mineralisation is often observed in conjunction with sulphide crystals such as pyrite, pyrrhotite, arsenopyrite, galena and sphalerite. Visible gold has been observed in drill core and rock exposures. The White Foil gold deposit is a quartz stockwork hosted in a gabbro. The gabbro is differentiated broadly into a quartz-rich phase in the west. This quartz gabbro unit is the most hydrothermally altered unit and contains the bulk of the gold mineralisation. The White Foil deposit is bounded to the west by hangingwall volcaniclastic rocks. To the east mineralisation becomes irregular and uneconomic in the more melanocratic phase of gabbro. Mineralisation is controlled by sheeted systems of stockwork veining, which has imparted strong alteration and sulphidation to the quartz gabbro. Structurally controlled deposit within a NNW trending shear associated with the regional Zuleika Shear Zone, on the lithological contact between the Victorious Basalt and Black Flag Volcanic Sediments. Mineralisation occurs in laminated quartz veins, brecciation and alteration zones with widths ranging from 0.2-20m along strike length of 0.3-1.0km. The Frog’s Leg deposit is located in the southern portion of the Kundana mining area, within the Achaean Norseman-Wiluna greenstone belt of the Eastern Goldfields Province. The Kundana gold deposits are structurally related to the Zuleika Shear Zone, a regional NNW-trending shear zone that juxtaposes the Ora Banda domain to the east and the Coolgardie domain to the west. The Frog’s Leg deposit is located on the sheared contact between the porphyritic “cat rock” (regionally known as the Victorious Basalt) and volcaniclastic rocks of Black Flag Beds. Mineralisation at Frog’s Leg is hosted within a number of steeply dipping NNW-SSE structures that are vertical or dipping steeply (~80 degrees) to the west. Surface and underground drilling intersect the mineralisation at an angle to minimise bias.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

CommodityUnits202420232022202120202019201820172016
Gold oz  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe120,535118,498143,820137,193
Silver oz  ....  Subscribe  ....  Subscribe  ....  Subscribe15,59025,71528,77322,457
All production numbers are expressed as payable metal. ^ Guidance / Forecast.

Operational metrics

Metrics20232022202120202019201820172016
Waste  ....  Subscribe
Ore tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe2,032 kt963 kt1,737 kt1,684 kt
Total tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe
Tonnes processed  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe1,660 kt1,654 kt1,711 kt1,441 kt
Annual processing capacity  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe1.6 Mt1.5 Mt1.5 Mt1.5 Mt
Waste OP  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe5,627 kt9,372 kt9,191 kt7,469 kt

Production Costs

CommodityUnits2023202220212020201920182017
Credits (by-product) Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe -3 / oz   -5 / oz   -5 / oz  
Cash costs Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,078 / oz **   991 / oz **   954 / oz **  
Cash costs (sold) Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,068 / oz **   994 / oz **   959 / oz **  
All-in sustaining costs (sold) Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,320 / oz **   1,181 / oz **   1,143 / oz **  
All-in costs Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,536 / oz **   1,604 / oz **   1,371 / oz **  
^ Guidance / Forecast.
** Net of By-Product.

Financials

Units2023202220212020201920182017
Capital expenditures (planned) M AUD  ....  Subscribe
Sustaining costs M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe 12   9.9   14.6  
Capital expenditures M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe 28.1   46.5   36.7  
Revenue M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe 212.9   191.1   231.8  
EBITDA M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe 75.2   67.3   90  
Operating Cash Flow M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe 63.9   70.2  

Required Heavy Mobile Equipment

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Personnel

Mine Management

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EmployeesContractorsTotal WorkforceYear
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Aerial view:

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