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Australia
Edna May Operation

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 Location:
1 km NNE from Westonia, Western Australia, Australia

  Address:

Westonia
Western Australia, Australia
6423
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Sub-level stoping
  • Longhole open stoping
  • Cemented backfill
Processing
  • Calcining
  • Gravity separation
  • Consep Acacia Reactor
  • Smelting
  • Centrifugal concentrator
  • Carbon re-activation kiln
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2024
Mining operations at Edna May focused on the Edna May underground mine, Greenfinch open pit, and the recently developed Marda Gold Project (open pit).
Latest NewsRamelius to bring Penny into production in 2021     November 10, 2020


Owners

Source: p. 11,14
CompanyInterestOwnership
Ramelius Resources Ltd. (operator) 100 % Indirect
Mineral tenement and land tenure status: Edna May is owned 100% by Edna May Operations Pty Ltd.

Edna May Operations Pty Ltd, a wholly owned subsidary of Ramelius Resources Ltd, is the owner and operator of the Edna May mine.

Deposit Type

  • Vein / narrow vein
  • Breccia pipe / Stockwork


Summary:

The Edna May deposit is located within the Westonia Greenstone Belt, within the Southern Cross Province of Western Australia’s Archaean Yilgarn Craton.

Mineralisation is hosted by the east-west striking, north dipping, Edna May Gneiss (EMG), which has a currently defined strike length of 1km, width of 140m and drilled depth extent of 700m. The EMG is a tonalitic quartz-feldspar-biotite gneiss interpreted to be a strongly metamorphosed granitic intrusion. Mafic-ultramafic amphibolites form the hangingwall and footwall units.

Gold mineralisation is widespread within the EMG and related to two quartz vein sets. One set comprises of widespread, thin, sheeted veins in a ladder of stockwork style, generally sub- parallel to stratigraphy. The second set are less frequent, larger veins which cross-cut the EMG and have much greater continuity. These veins formed the basis of the historical underground ‘reefs’ and the two significant lodes defined in the early 2018 underground infill drilling programme.

These lodes have typical dimensions of 2-5m thickness, strike lengths of 80-110m and currently drilled dip extents of 200m. Associated visible gold is commonly seen in drill core.


Mining Methods

  • Truck & Shovel / Loader
  • Sub-level stoping
  • Longhole open stoping
  • Cemented backfill


Summary:

Mining operations at Edna May focused on the Edna May underground mine, Greenfinch open pit, and the recently developed Marda Gold Project (Python, Dugite, Dolly Pot, Goldstream open pits in the Marda Central area).

Edna May lode (UG deposit) is modelled with consideration of extraction by conventional sub-level open stoping methods (open stoping underground method).

Mining contractor:
RUC Cementation Mining
- Full underground services including all decline and lateral development
- Production including long hole open stoping, blasting, bogging and backfilling of stopes with CRF. The level interval varies from 16 to 20m (floor to floor) to limit up dip stope length to 18m. Cemented rock fill sill pillars is emplaced at mid-levels to divide the mine design into two top down stope sequences
- Predominately new equipment fleet including new Sandvik Jumbo DD421, CAT 2900, CAT 1700K. Longhole drilling DL421.

The Edna May orebody is open at depth with high grade intersections seen down to 600 metres below surface. Open pit mining is by conventional drill and blast, load and haul method. A bulk mining approach has been adopted to the extraction of remnant high grade reef structures and associated stockwork mineralisation. This allows the mine to employ a single mining fleet for most of the mine life. The open pit is being mined in two stages and is carried out on 10.5 metre benches and 3.5 metre flitches.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1.06m x 1.37m 1
Cone crusher ....................... Subscription required 1
Mobile crusher(s) 2
SAG mill 6.71m x 2.59m 2000 kW 1
Ball mill 5.03m x 8.21m 3720 kW 1

Summary:

Blended ore is processed through 2 stage crushing circuit. Crushed ore is stored on a coarse ore stockpile with a live capacity of approximately 3,800 tonnes. The grinding circuit consists of a primary SAG mill, secondary ball mill crushing circuit.

Primary crushing/grinding plant/machinery:

Mobile crushing fleet including jaw crusher, cone crusher, vibrating screen and 2 x stacker conveyors. 70t and 20t cranes.

Grinding plant equipment:
SAG with 2,000kW installed power, SAG mill size 6.71m x 2.59m, rubber-steel composite liners, Ball mill with 3,720kW installed power, ball mill size 5.03m x 8.21m, composite. Classification WarmanCavex 400mm (400CVX).

Screening plant/equipment:
Trash screen horizontal vibratory 2.4m x 6.1m, polyurethane deck 0.8mm cross flow slots.

Recycle crusher:
Terex RC45 cone crusher, vibrating feeder bypass using an overflow bin. Nominal reduction CCS of 14mm.


Processing

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

Flow Sheet: Subscription required

Summary:

The Edna May mill is a 2.9 million tonne per annum (Mtpa) conventional CIL gold plant. Mill feed is now being sourced from the new underground, the nearby Greenfinch open pit, complemented by stockpiled ore and the Marda open pit project.

Mineral recovery plant/equipment:
Knelson concentrator XD 40, followed by Consep Acacia Reactor 3 type CS 1000DM. CIP leach circuit with 2 x 2,000m tanks and 6 x 3 1,100m adsorption tanks. Elution circuit - pressure Zadra. 3 x electrowinning tanks, 2 in parallel for leach circuit and 1 for gravity circuit.

Refining plant/equipment:
8t elution column, 8t acid wash column.

Recoveries & Grades:

CommodityParameter20202019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required93.992.891.7
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required1.20.910.82

Production:
The figures reported for 2018 are for the nine months ended 30 June 2018, the period of Ramelius ownership.

CommodityUnits202120202019201820172016
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required72,52170,18871,028
Silver oz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20202019201820172016
Ore tonnes mined  ......  Subscription required574 kt2,079 kt2,082 kt2,351 kt
Tonnes milled  ......  Subscription required2,842 kt2,010 kt2,580 kt2,945 kt
Annual milling capacity  ......  Subscription required2.7 Mt3 Mt2.6 Mt
Subscription required - Subscription is required.

Reserves at June 30, 2020:
Edna May: Greenfinch open pit cutoff 0.6 g/t. Edna May UG cutoff 2.1 g/t. Marda pits cut off 0.7g/t.

CategoryTonnage CommodityGradeContained Metal
Proven 1,140,000 t Gold 1.39 g/t 51,000 oz
Probable 2,200,000 t Gold 1.96 g/t 139,000 oz
Proven & Probable 3,300,000 t Gold 1.78 g/t 189,000 oz
Measured 1,360,000 t Gold 1.07 g/t 47,000 oz
Indicated 22,900,000 t Gold 1.15 g/t 850,000 oz
Inferred 8,000,000 t Gold 1.22 g/t 314,000 oz
Total Resource 32,400,000 t Gold 1.16 g/t 1,210,000 oz

Commodity Production Costs:

CommodityUnits20202019201820172016
Credits (by-product) Gold AUD -8 / oz -10 / oz
All-in sustaining costs (sold) Gold AUD  ......  Subscription required  ......  Subscription required 1,203 / oz
All-in sustaining costs (sold) Gold AUD 1,440 / oz† 1,504 / oz†
C1 cash costs Gold AUD  ......  Subscription required  ......  Subscription required 1,050 / oz
C1 cash costs Gold AUD 1,309 / oz† 1,407 / oz†
All-in costs Gold AUD 1,862 / oz† 1,605 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units202120202019201820172016
Capital expenditures (planned) M AUD  ......  Subscription required
Sustaining costs M AUD  ......  Subscription required1.4   2.2   4.3  
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required 28.5   7.3  
Revenue M AUD  ......  Subscription required  ......  Subscription required115.1   116.8   119.8  
Gross profit M AUD  ......  Subscription required  ......  Subscription required15.7  
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required15.7  
After-tax Income M AUD  ......  Subscription required  ......  Subscription required15.7  
EBIT M AUD  ......  Subscription required  ......  Subscription required
EBITDA M AUD 20.6   12.9  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 25, 2021
Subscription required - Subscription is required.

Staff:

EmployeesTotal WorkforceYear
Subscription required 2020
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Corporate Presentation 2018
Press Release 2018
Quarterly Report 2018
Annual Report 2017
Corporate Presentation 2017
Fact Sheet 2017
Annual Report 2016
Other 2016
Fact Sheet 2010
Subscription required - Subscription is required.

News:

NewsDate
Ramelius to bring Penny into production in 2021 November 10, 2020

Aerial view:

Subscription required - Subscription is required.

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