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Australia
Cowal Mine (Cowal UG expansion Project)

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 Location:
35 km NE from West Wyalong, New South Wales, 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
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Centrifugal concentrator
  • Carbon re-activation kiln
  • Smelting
  • Flotation
  • Concentrate leach
  • Inline Leach Reactor (ILR)
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life12 years (as of Jan 1, 2020)
July 23, 2020 - Evolution has also completed the pre-feasibility study for the stage one underground project. It plans to apply for an underground mining permit early in the December quarter.

The company expects underground mining rates at Cowal to hover between 1.5–2 million tonnes a year, supporting an annual production rate beyond 300,000 ounces.

Evolution stated that an environmental impact study — which forms part of the significant state development — will be on public display in mid-October, with its feasibility study for the mine remaining on course.

If the necessary approvals are provided, construction of the underground development could commence as early as 2021 with operations to start in 2023.
Latest NewsEvolution Mining: Cowal leads Evolution’s continued gold growth     April 17, 2019


Owners & OPERATOR

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

Deposit Type

  • VMS


Summary:

The Cowal gold deposits (E41, E42, E46, Galway, and Regal) occur within the 40km long by 15km wide Ordovician Lake Cowal Volcanic Complex, east of the Gilmore Fault Zone within the eastern portion of the Lachlan Fold Belt. There is sparse outcrop across the Lake Cowal Volcanic Complex and, as a consequence, the regional geology has largely been defined by interpretation of regional aeromagnetic and exploration drilling programs.

The Lake Cowal Volcanic Complex contains potassium rich calc-alkaline to shoshonitic high level intrusive complexes, thick trachyandesitic volcanics, and volcaniclastic sediment piles. The Cowal Complex is a strong regional magnetic high anomaly with a sharp linear western margin, represented by the Gilmore Fault Zone, separating the Lake Cowal Volcanics from the relatively low magnetic response of sediments to the west.

Similar Ordovician magmatic rocks are found over a large area of the eastern Lachlan Fold Belt and are commonly associated with copper-gold mineralisation (e.g., Northparkes, Cadia, Peak Hill, and Gidginbung). The main diorite intrusion at E42 has a K-Ar dating of 456 ± 5 Ma (Early to Mid- Ordovician). The gold deposits at Cowal are structurally hosted, epithermal to mesothermal gold deposits occurring within and marginal to a 230 m thick dioritic to gabbroic sill intruding trachyandesitic volcaniclastic rocks and lavas.

The overall structure of the gold deposits is complex but in general consists of a faulted antiform that plunges shallowly to the north-northeast. The deposits are aligned along a north-south orientated corridor with bounding faults, the Booberoi Fault on the western side and the Reflector Fault on the eastern side (the Gold Corridor).

The mineralisation at the Cowal Mine comprises four deposits: GRE46, E41, E42 and E46.

The GRE46 deposit is subdivided into the open pit and underground resources. The GRE46 zone trends north-south, dips vertical to -70° west, and extends approximately 1,650m along strike, 175m across strike and up to 800m down dip. Individual lenses in the GRE46 mineralised zone are 1.0m to 15m wide, 25m to 250m long, and extend 50m to 200m down dip. Lenses consist of narrow high-grade quartz carbonate, pyrite and base metal veins controlled within a structural north-south corridor, occasional zones of grade enrichment occur in dilatant structures within the deposit known as Quartz Sulphide Breccias. Host lithology varies from poorly mineralised massive intrusive diorites and fine volcaniclastic sediments through to the preferential host of Trachyandesite lava, lenses of coarse to conglomeritic volcaniclastic sediments to the south and the Dalwhinnie Andesitic sill in the east.

The E41 West mineralisation strikes north-northeast and dips -70° east, and measures 750m along strike and 250 m across strike. Individual mineralised zones are 35 m to 50m wide and extend down dip for 125m. The E41 East mineralisation strikes east-west and dips -35° to -80° south, and measures 475m along strike and 500 m across strike. Individual mineralised zones are 35m to 50m wide and extend down dip for 225m.

The E42 deposit dips -35° to -45° to the south west with an approximate extent of 850m by 850m and extends 500m down dip. Mineralisation is contained within small discontinuous veins contained within larger mineralised envelopes approximately 50m wide.

The E46 deposit mineralisation trends north-northeast, dips -40° west to flat-lying, and measures approximately 650m along strike and 17m across strike. Individual zones are approximately 50m wide and extend 200m down dip.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Cowal operation is currently an open pit mining operation utilising conventional drill and blast, load and haul methodologies, mining nominally 9m benches as 3 x 3m flitches. Mining commenced in 2005 and processing started in 2006. Mining is carried out with a company-owned fleet of mining equipment. Ore is hauled by truck from the pit face to either a stockpile area or directly fed into the primary crusher.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Gyratory crusher ....................... Subscription required 1
Cone crusher ....................... Subscription required 2
SAG mill 36' X 20.5' 1
Ball mill 22' x 36.5' 1
Vertical mill / Tower ....................... Subscription required 1

Summary:

Primary crushing:Metso 54-75 Superior MK-II gyratory crusher

Grinding Plant Equipment:FFE 36' x 20.5' SAG. FFE 22' x 36.5' ball mill

Grinding Media:Forged steel, 125mm balls (SAG mill), 105mm balls (ball mill)

Screening plant/equipment:Schenck Vibrating (SAG discharge), Delkor Linear (COF)

Recycle crusher:2 x Sandvik H6800 hydrocone cone crushers.


Processing

  • Centrifugal concentrator
  • Carbon re-activation kiln
  • Smelting
  • Flotation
  • Concentrate leach
  • Inline Leach Reactor (ILR)
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Cowal processing plant was commissioned in May 2006 and consists of crushing, two stage grinding, sulphide flotation, regrind and CIL recovery. The plant currently processes around 9.0Mtpa.

Mineral liberation/recovery
Method: flotation, regrind, CIL of floatation concentrate and tail.
Equipment: 2 x SK1200 and 10 x OK200TC (flotation), Metso Vertimill (VTM1000WB), 2 x Metso 355kW SMDs, Con Pre-ox - 4,000m3, 2 x 4,000m3 Con Leach, 6 x 1,000m3 Con CIL, 7 x 2,400m3 Tail CIL.

Refining - 10t AARL elution circuit, ANSAC regeneration kiln.
Gravity Circuit - Falcon concentrator / Acacia Reactor.

Recoveries & Grades:

CommodityParameter20202019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required83.283.5
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required1.371.33

Production:

CommodityUnits202120202019201820172016
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required257,951263,015237,940
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 required10,203 kt8,714 kt
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required2,093 kt3,937 kt
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required7,171 kt6,666 kt
Subscription required - Subscription is required.

Reserves at December 31, 2019:
Mineral Resource open pit cut-off 0.35 g/t.
Ore Reserve open pit cut-off 0.45 g/t.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Total 42.79 Mt Gold 0.63 g/t 860 koz
Probable Total 89.43 Mt Gold 0.96 g/t 2,773 koz
Proven & Probable Total 132.22 Mt Gold 0.85 g/t 3,634 koz
Measured Total 42.79 Mt Gold 0.63 g/t 860 koz
Indicated Total 170.94 Mt Gold 0.96 g/t 5,263 koz
Inferred Total 44.02 Mt Gold 1.74 g/t 2,468 koz
Total Resource Total 257.76 Mt Gold 1.04 g/t 8,591 koz

Commodity Production Costs:

CommodityUnits202120202019201820172016
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required -25 / oz -25 / oz -20 / oz
Cash costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required† 683 / oz† 606 / oz† 604 / oz†
Cash costs Gold AUD  ......  Subscription required†  ......  Subscription required† 675 / oz† 613 / oz† 591 / oz†
All-in sustaining costs (sold) Gold AUD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 877 / oz† 833 / oz† 776 / oz†
All-in costs Gold AUD  ......  Subscription required†  ......  Subscription required† 1,223 / oz† 941 / oz† 789 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units202120202019201820172016
Capital expenditures (planned) M AUD  ......  Subscription required
Sustaining costs M AUD  ......  Subscription required  ......  Subscription required39.7  43.9   29.4  
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required124.62  27.1  
Revenue M AUD  ......  Subscription required  ......  Subscription required422.86  440.69   375.35  
EBITDA M AUD  ......  Subscription required  ......  Subscription required234.22  258.43   222.24  
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required225.81  
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2020:
HME TypeModelQuantityLeased or
Contractor
Dozer (crawler) ....................... Subscription required 4
Dozer (rubber tire) ....................... Subscription required 1
Drill ....................... Subscription required 5 Leased
Drill ....................... Subscription required 1
Excavator ....................... Subscription required 1
Excavator ....................... Subscription required 1
Excavator ....................... Subscription required 1
Excavator ....................... Subscription required 1
Excavator ....................... Subscription required 1
Grader ....................... Subscription required 3
Loader ....................... Subscription required 4
Truck (dump) ....................... Subscription required 16
Truck (dump) ....................... Subscription required 3
Truck (water) ....................... Subscription required 2
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 11, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 11, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 11, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required Subscription required Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Corporate Presentation 2018
Fact Sheet 2018
Quarterly Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Fact Sheet 2017
Annual Report 2016
Other 2016
Subscription required - Subscription is required.

News:

NewsDate
Evolution Mining: Cowal leads Evolution’s continued gold growth April 17, 2019
Evolution goes underground at Cowal with Pybar February 19, 2019
Evolution gains approval for Cowal extension October 26, 2018
Evolution Mining expansion of Cowal mine moves forward October 5, 2018

Aerial view:

Subscription required - Subscription is required.

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