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Australia
Cowal UG expansion Project (Cowal)

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 Location:
38 km NE from West Wyalong, New South Wales, Australia

  Project Contacts:
Level 24 175 Liverpool Street
Sydney
New South Wales, Australia
2000
Phone  ...  Subscription required
Fax+61-2-9696-2901
WebsiteWeb
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  • Overview
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  • Geology
  • Mining
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  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageConstruction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sub-level open stoping (SLOS)
  • Paste backfill
Processing
  • Centrifugal concentrator
  • Smelting
  • ACACIA reactor
  • Gravity separation
  • Desliming
  • Carbon re-activation kiln
  • Flotation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life17 years (as of Jan 1, 2021)
The Cowal Underground Project Feasibility Study was completed during FY21 and has received Board and regulatory approval for development. The Cowal underground will provide a higher-grade ore source which will be blended with E42 open pit ore to drive the operation’s production profile to 350,000 ounces per annum.
Latest NewsNew Evolution At Cowal Gold Mine     October 2, 2021


Owners

Source: p. 16,20
CompanyInterestOwnership
Evolution Mining Ltd. (operator) 100 % Indirect
The Cowal Mine tenement incorporates seven contiguous exploration licences (EL) and two ML covering 1073 km2. All leases are 100% held by Evolution. Evolution operates wholly-owned mine - Cowal in New South Wales.

Deposit Type

  • VMS


Summary:

Gold mineralisation at Cowal is most concentrated to a north-south orientated corridor hosted in second and third order structures marginal to and parallel to the Gilmore Suture. The gold deposits are hosted by a shallowing-upwards sequence of semi-conformable sedimentary, volcaniclastic, and volcanic rocks of trachydacitic and trachyandesitic composition that have been intruded by a diorite sill, andesite dome, and various dykes. The sequence strikes northeast–southwest and dips moderately 30° to 40° to the northwest.

The mineralisation at CGO comprises six deposits: E41E, E41W, E42, Galway/Regal, E46 and GRE46. GRE46.

The GRE46 zone trends north-south, dips vertical to -70° west, and extends approximately 2km along strike, 200m across strike and at least 1km down dip. Individual lenses in the GRE46 mineralised zone are 1-15m wide, 25-250m long, and extend 50-200m down dip. Lenses consist of narrow high-grade quartz carbonate, pyrite and base metal veins controlled within a structural north-south corridor, broad zones of alteration around lithology contacts and 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 diorite and fine volcaniclastic sediments through to the preferential mineralised trachydacitic lava in the north, lenses of coarse to conglomeritic volcaniclastic sediments and the andesitic Dalwhinnie lava unit to the east. Lithological contacts with strong competency contrasts also provide broad areas of mineralisation. The trachydacite is brittle with common hyaloclastite and peperitic textures, commonly brecciated to peppertic and is both a good geochemical and rheological host for Au mineralisation.

Vein orientation at the GRE46 deposit displays a distinct change in orientation on a nominal northing of 37,000mN. Vein in the south of the deposit are generally orientated at 50°/120°. Veins in the north of the deposit rotate clockwise and steep to a general dip direction of 70°/180°.

The Mineral Resource area which incorporates the E41, E42, E46 and the GRE46 has the following dimensions, 4,425 m (north), 2,500 m (east) and 1,300 m (elevation). GRE46 has dimensions of 1,600m (north), 800m (east) and 1,100m (elevation).


Mining Methods

  • Sub-level open stoping (SLOS)
  • Paste backfill


Summary:

Mining method assessments indicated that sub-level open stoping (SLOS) with pastefill was the most appropriate mining method for the GRE46 underground deposit. This ensured maximum extraction of the economic portion of the deposit, while ensuring no surface subsidence due to the deposit being under Lake Cowal.

Mineable stope shapes were created using the Mineable Shape Optimiser (MSO) software from Datamine, according to stope design parameters established in the PFS. Stope shapes were created using Au grade as the MSO optimisation field at an incremental cut-off grade.

Stope shapes were informed by geotechnical assessment to determine stable stope spans. The typical sublevel interval is 30m, strike length of 20m and stope width of up to 20m.

All stopes above the 1080 mRL have been excluded from the design to ensure the oxide boundary is not intersected, reducing the likelihood of surface subsidence.

An Equivalent Linear Overbreak Sloughing (ELOS) stope dilution of 0.2m footwall and 0.2m hangingwall was applied in the MSO shape parameters. A further 5% stope dilution has been applied in the schedule to account for any further dilution that may occur.

Ore drive development had no dilution applied to prevent overestimation of metal. Other development has a dilution factor of 10% applied.

Mining recoveries were set at 100% for development activities, and 95% for stoping activities.

All material mined underground will be trucked to surface to the Run of Mine (ROM) pad or waste dump.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1

Summary:

The following process plant modifications have been included in the study:
- a second primary jaw crusher dedicated to the treatment of underground ore. This crusher will remove tramp metal from the underground ore feed.


Processing

  • Centrifugal concentrator
  • Smelting
  • ACACIA reactor
  • Gravity separation
  • Desliming
  • Carbon re-activation kiln
  • Flotation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

Processing of ores will be through the current plant which has been in operation since 2006. Laboratory test-work of underground ores indicates they will respond similarly to the current hard rock sulphide ores being processed from the existing open pit adjacent to the GRE46 underground.

The current processing facility utilises commonly used crushing and grinding circuitry followed by a combination of gravity, flotation and cyanide leaching methods for the recovery and extraction of gold.

The following process plant modifications have been included in the study:

- an additional FTL elution circuit and carbon regeneration kiln

- a deslimed tailings circuit located at the process plant's tailings area to supply tailings to the surface pastefill plant for operational backfill activities. The pastefill plant design parameters are based on a specification of 150m3/h.

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, % 87
Gold Head Grade, g/t 2.5

Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold oz 350,0001.7
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Annual ore mining rate  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

Reserves at December 31, 2020:
Mineral Resource cut-off - 1.5 g/t.
Ore Reserve cut-off - 1.8 g/t.

CategoryTonnage CommodityGradeContained Metal
Probable 12.55 Mt Gold 2.59 g/t 1,045 koz
Indicated 22.78 Mt Gold 2.55 g/t 1,868 koz
Inferred 14.75 Mt Gold 2.43 g/t 1,151 koz
Total Resource 37.53 Mt Gold 2.5 g/t 3,019 koz

Operating Costs:

Units2021
UG mining costs ($/t mined) AUD 75 *
Processing costs ($/t milled) AUD  ......  Subscription required
* According to 2021 study. Average cost.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M AUD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2021
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....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
Subscription required - Subscription is required.

News:

NewsDate
New Evolution At Cowal Gold Mine October 2, 2021
Evolution approves Cowal underground expansion July 16, 2021
Evolution seeks approval for Cowal underground project October 12, 2020
Evolution confidence in Cowal development grows July 23, 2020

Aerial view:

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