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Australia
Mungari Operation (Frog’s Leg Mine, White Foil Mine)

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 Location:
18 km W from Kalgoorlie, Western Australia, Australia

  Regional Office:
Level 30 175 Liverpool Street
Sydney
Western Australia, Australia
2000
Phone  ...  Subscription required
Fax+61-2-9696-2901
WebsiteWeb
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Overview

StageProduction
Mine TypeOpen Pit / Underground
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Longhole stoping
  • Paste backfill
Processing
  • Gravity separation
  • Consep Acacia Reactor
  • Carbon re-activation kiln
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • AARL elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life10 years (as of Jan 1, 2020)
Mungari underwent a transformation during FY20 with a complete change in operational strategy. Mungari completed access development to the newly discovered Boomer ore body, improved plant throughput to deliver a 16% improvement above FY20 budget to a sustainable 2Mtpa throughput rate and commenced development of the Cutters Ridge open pit.


Owners & OPERATOR

Source: p. 179
CompanyInterestOwnership
Evolution Mining Ltd. 100 % Indirect
Evolution Mining Mungari Pty Ltd. (operator) 100 % Direct

Deposit Type

  • Breccia pipe / Stockwork


Summary:

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.


Mining Methods

  • Truck & Shovel / Loader
  • Longhole stoping
  • Paste backfill


Summary:

White Foil is the open pit mine at the Mungari operations and utilises conventional drill and blast, load and haul methods.

At underground mine, Frog’s Leg mining methodology is top-down long hole stoping, with paste fill.

5m x 5.5m decline from portal in pit, then twin declines from 125 metres below surface (mbs) to access north (Mist) and south (Rocket) sections Deepest current level is 700mbs.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher ....................... Subscription required 1.25m x 0.94m 220 kW 1
Cone crusher ....................... Subscription required 315 kW 2
Ball mill 5.5m x 8.74m 4500 kW 1

Summary:

Three stage crushing:
- Primary Metso C140 Jaw crusher (220kW) -1250 x 940mm throat- feed size 800mm, product size p80-120mm.
- Secondary(1) and tertiary(1) crushers: Metso HP 4 (315kW) Product size 17mm. Product Screen: Joest inclined vibrating screen 2.44 x 7.6m. 4 x conveyor belts, Belt and static magnets as well as a rock breaker for the primary crusher.

Grinding
Ball Mill with 4,500kW installed power, Mill size 5.5m(dia) x 8.74m(l), Polymet composite liners, Classification Weir Cavex 250mm (x11) Grind size p80 – 106 µm.


Processing

  • Gravity separation
  • Consep Acacia Reactor
  • Carbon re-activation kiln
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • AARL elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

Process method: Three stage crushing, ball mill, gravity and CIP.

Leaching: 2 x 1,140 m3 tanks.
Adsorption: 6 x 750 m3 tanks.
Elution: split AARL.
Electrowinning: 3 x Consep tanks [2 x carbon-in-leach (CIL), 2 x gravity]

Gravity circuit
Concentrator: 2 x Knelson
Intensive Leach: Consep Acacia

Processing plant operational data was used to drive higher gold production. Some of the initiatives the team executed to achieve this result included:
- Reviewing and analysing grinding circuit data which identified instances where capacity was not being taken advantage of and making changes which led to increases in mill utilisation
- Ensuring the availability of crushed ore stock in front of the mill so that crusher shutdowns have less impact The $A12.4 million improvement has been achieved due to higher gold production than previously obtained as a result of these process improvements through the analysis of data.
[p. 62, ........

Recoveries & Grades:

CommodityParameter20202019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 2.472.42.362.813.16
Subscription required - Subscription is required.

Production:

CommodityUnits20202019201820172016
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required143,820137,193
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as payable metal. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required1,684 kt
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required1,441 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required1.5 Mt
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Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 1.01 Mt Gold 2.47 g/t 80 koz
Probable 10.62 Mt Gold 1.43 g/t 489 koz
Proven & Probable 11.63 Mt Gold 1.52 g/t 568 koz
Measured 1.11 Mt Gold 3.22 g/t 115 koz
Indicated 40.15 Mt Gold 1.31 g/t 1,695 koz
Inferred 9.66 Mt Gold 1.93 g/t 600 koz
Total Resource 50.92 Mt Gold 1.47 g/t 2,409 koz

Commodity Production Costs:

CommodityUnits20202019201820172016
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required -5 / oz -3 / oz
Cash costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 959 / oz† 713 / oz†
Cash costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 954 / oz† 756 / oz†
All-in sustaining costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,143 / oz† 1,024 / oz†
All-in costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,371 / oz† 1,128 / oz†
^ Guidance / Forecast.
† Net of By-Product.
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Financials:

Units20202019201820172016
Capital expenditures (planned) M AUD
Sustaining costs M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment:
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Feb 8, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 8, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 8, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 8, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2020
Subscription required 2019
Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
Fact Sheet 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Fact Sheet 2017
Quarterly Report 2017
Annual Report 2016
Other 2016
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Aerial view:

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