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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
  • Sulfuric acid (reagent)
  • Gravity separation
  • Flotation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2032
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

 
CompanyInterestOwnership
SRG Global (operator)
Evolution Mining 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. 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 E41 West mineralisation strikes north northeast and dips -70° east, and measures 750m along strike and 250m across strike. Individual mineralised zones are 35m 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 500m across strike. Individual mineralised zones are 35m to 50m wide and extend down dip for 225m. The E42 deposit comprises the Regal/Galway corridor and the E42 Main Zone. The Regal/Galway corridor trends north-south, dips vertical to -70° west, and is composed of small and discontinuous lenses. The corridor is approximately 900m along strike and 200m wide. The E42 Main Zone trends north-south and dips -35° to -45° west. The two principal domains in the E42 Zone are separated by the Cowal Fault. Overall, the E42 Main Zone mineralisation is approximately 850m by 850m and extends 500m down dip.

The E46 deposit is subdivided into the East and West zones. The East zone is a continuation of the Regal/Galway corridor, trends north-south, dips vertical to -70° west, and extends approximately 750m along strike and 175m across strike. Individual lenses in the E46 East mineralised zone are 1.0m to 15m wide, 25m to 250m long, and extend 50m to 200m down dip. The E46 West 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:

Mining production is derived from a single open pit, utilising conventional drill and blast, load and haul methodologies, mining nominally 9m benches in flitches. The operation is scheduled to continue until FY25 and the processing until FY33 at current estimates. The LOM strip ratio is currently 1.27:1.


Crushing and Grinding


Processing

  • Sulfuric acid (reagent)
  • Gravity separation
  • Flotation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

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

Mineral liberation/recovery method:Flotation, regrind, CIL of concentrate

Mineral liberation plant/equipment:2 x SK1200 and 10 x OK200TC (flotation), Metso Vertimill 3 (VTM1000WB) and 2 x Metso 355kW SMD’s (regrind), 4,000m 3 3 Pre-Ox, 2 x 4,000m and 6 x 1,000m CIL Tanks

Gravity circuit:Falcon Concentrator / Acacia Reactor

Chemicals/reagents used:Orica (Cyanide), Ixom (Hydrochloric acid, sodium hydroxide, sulphuric acid, SMBS, PAX), BOC (Oxygen), Boral (Lime), Solvay Interox (Hydrogen peroxide), SNF (Flocculant).

Refining plant/equipment:10t AARL ........

Recoveries & Grades:

CommodityParameter2019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 1.211.251.371.33
Subscription required - Subscription is required.

Production:

CommodityUnits20202019201820172016
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required263,015237,940
Silver oz  ......  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:

Metrics2019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required8,714 kt
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required3,937 kt
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required6,666 kt
Subscription required - Subscription is required.

Reserves at December 31, 2018:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven In-Situ (OP) 46.54 Mt Gold 0.69 g/t 1,027 koz
Probable In-Situ (OP) 94.7 Mt Gold 0.94 g/t 2,854 koz
Proven & Probable In-Situ (OP) 141.25 Mt Gold 0.85 g/t 3,880 koz
Measured In-Situ (OP) 46.54 Mt Gold 0.69 g/t 1,027 koz
Indicated In-Situ (OP) 174.92 Mt Gold 0.85 g/t 4,784 koz
Inferred In-Situ (UG) 13.55 Mt Gold 3.24 g/t 1,411 koz
Inferred In-Situ (OP) 5.63 Mt Gold 1.07 g/t 193 koz
Inferred Total 19.18 Mt Gold 2.6 g/t 1,604 koz
Total Resource In-Situ (UG) 13.55 Mt Gold 3.24 g/t 1,411 koz
Total Resource In-Situ (OP) 227.09 Mt Gold 0.82 g/t 6,004 koz
Total Resource Total 240.64 Mt Gold 0.96 g/t 7,415 koz

Commodity Production Costs:

CommodityUnits20202019201820172016
Cash costs (sold) Gold AUD  ......  Subscription required ^
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required -25 / oz -20 / oz
Cash costs Gold AUD  ......  Subscription required†  ......  Subscription required† 613 / oz† 591 / oz†
Cash costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required† 606 / oz† 604 / oz†
All-in sustaining costs (sold) Gold AUD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 833 / oz† 776 / oz†
All-in costs Gold AUD  ......  Subscription required†  ......  Subscription required† 941 / oz† 789 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

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


Heavy Mobile Equipment as of December 31, 2018:
HME TypeModelQuantity
Dozer ....................... Subscription required 5
Dozer ....................... Subscription required 1
Drill ....................... Subscription required 5
Drill ....................... Subscription required 1
Excavator ....................... Subscription required 1
Excavator ....................... Subscription required 1
Excavator ....................... Subscription required 1
Excavator ....................... Subscription required 1
Excavator ....................... Subscription required 1
Excavator ....................... Subscription required 2
Grader ....................... Subscription required 3
Truck (dump) ....................... Subscription required 16
Truck (dump) ....................... Subscription required 5
Truck (water) ....................... Subscription required 2
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 23, 2020
....................... Subscription required ....................... Subscription required Subscription required Jul 23, 2020
....................... Subscription required ....................... Subscription required Subscription required Jan 19, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 23, 2020
Subscription required - Subscription is required.

Staff:

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

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Fact Sheet 2017
Annual Report 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 gold production takes unexpected hits January 24, 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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