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Australia
Mt Rawdon Mine

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 Location:
73 km SW from Bundaberg Central, Queensland, Australia

  Regional Office:
Level 24 175 Liverpool Street
Sydney
New South Wales, Australia
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
  • Smelting
  • Centrifugal concentrator
  • Intensive Cyanidation Reactor (ICR)
  • Carbon re-activation kiln
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • AARL elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2027


Owners

Source: p. 19,215
CompanyInterestOwnership
Evolution Mining Ltd. 100 % Indirect
Mt Rawdon Operations Pty Ltd. (operator) 100 % Direct
Evolution has owned and operated Mt Rawdon since November 2011.

Deposit Type

  • Intrusion related


Summary:

The Mt Rawdon gold deposit is a massive intrusive-related low grade gold deposit that exhibits excellent characteristics conducive to low cost mining and treatment. Alluvial gold was first discovered on the hill flanks in 1946 leading to early mining endeavours however the gold grade was too low to be profitable in those times. The gold mineralisation is closely associated with fine disseminated pyrite and base metal sulphides as well as in irregular discrete veinlets within the igneous host rocks. The gold grade is statistically independent of the sulphide percentage of the host however. The host rocks are predominantly rhyodacitic intrusives, breccias and a related volcaniclastic pile, with the orebody dipping moderately to the south west.


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 10-15m benches. The operation is scheduled to continue until FY25 at current estimates with a remaining life of mine strip ratio of 2:1.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Gyratory crusher ....................... Subscription required 42" x 65" 1
Cone crusher ....................... Subscription required 1
Cone crusher ....................... Subscription required 1
SAG mill ....................... Subscription required 28' 1
Ball mill ....................... Subscription required 1

Summary:

Crushing plant total capacity: 720tph (two stage crushing)

Primary crushing/grinding plant/machinery:
- Allis Charmers 42/65 superior gyratory.

Secondary crushing/grinding plant/machinery:
- Jaques J65;
- Pre screen with double deck Joest vibrating screen;
- Synton feeder to screen and bypass using an overflow bin for lump;
- Nominal reduction ratio of 5-1 (125mm primary crush to 25mm secondary crush).

Grinding plant equipment:
- Dominion 28’ SAG;
- Nordberg 42/70HG ball mill.

Grinding media:
- High manganese steel, 125mm ball (steel lined SAG mill) 64mm balls (rubber lined ball mill). Grind size 60% -106µm.

Recycle crusher:
- Autofine 736 Cone Crusher (Allis Chalmers).


Processing

  • Smelting
  • Centrifugal concentrator
  • Intensive Cyanidation Reactor (ICR)
  • Carbon re-activation kiln
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • AARL elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Mt Rawdon processing plant consists of primary and secondary crushing, SAG and ball milling, followed by conventional cyanidation leaching. Gold feed is recovered through a gravity circuit prior to the flotation circuit to produce dore gold bars which are sold to the ABC Refinery in Sydney.

Ore treatment/processing method/s:
- Conventional crush-grind-CIL to produce gold dore.

Nameplate capacity of plant: 3.5Mtpa.

Mineral liberation/recovery method: CIL.

Mineral liberation plant/equipment:
- 1 x 1,500m3 leaching tank;
- 5 x 1,500m3 adsorption tanks.

Gravity circuit: Knelson Concentrator 13% of gold recovered by gravity.

Process pumps: Warman 10/12 split casing.

Chemical/reagents used: Air Liquide (oxygen), Unmin (lime), Elgas (LPG), IXIM (HCl, caustic), Orica (cyanide), Jacobi (carbon).

Refining plant/equipment: 8t AARL elution column.

Recoveries & Grades:

CommodityParameter202120202019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required88.888.590.4
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required1.141.060.86

Production:

CommodityUnits2022202120202019201820172016
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required105,053101,33185,002
Silver oz  ......  Subscription required  ......  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:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required3,202 kt4,444 kt5,005 kt3,307 kt
Waste  ......  Subscription required  ......  Subscription required3,404 kt4,650 kt5.56 Mt1.9 Mt
Tonnes processed  ......  Subscription required  ......  Subscription required3,245 kt3,241 kt3,351 kt3,421 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required3.5 Mt3.5 Mt3.5 Mt
Subscription required - Subscription is required.

Reserves at December 31, 2020:
Mineral Resource cut-off 0.21 g/t.
Ore Reserve cut-off 0.3 g/t.

CategoryTonnage CommodityGradeContained Metal
Proven 4.26 Mt Gold 0.41 g/t 56 koz
Probable 15.82 Mt Gold 0.67 g/t 342 koz
Proven & Probable 20.08 Mt Gold 0.62 g/t 398 koz
Measured 7.29 Mt Gold 0.34 g/t 81 koz
Indicated 32.91 Mt Gold 0.6 g/t 630 koz
Inferred 10.47 Mt Gold 0.52 g/t 175 koz
Total Resource 50.66 Mt Gold 0.54 g/t 885 koz

Commodity Production Costs:

CommodityUnits202120202019201820172016
Credits (by-product) Gold AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required -26 / oz -38 / oz -34 / oz
Cash costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 680 / oz† 640 / oz† 736 / oz†
Cash costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 693 / oz† 630 / oz† 726 / oz†
All-in sustaining costs (sold) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 884 / oz† 873 / oz† 1,024 / oz†
All-in costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 987 / oz† 1,065 / oz† 1,471 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M AUD  ......  Subscription required
Sustaining costs M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required8.6   14.2   16.4  
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required19.5   33.3   53.8  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required179.4   166.5   136.3  
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required93   91.6   65.7  
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required69.2  
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2020:
HME TypeModelQuantity
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (rubber tire) ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Shovel ....................... Subscription required ....................... Subscription required
Shovel ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... 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 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Fact Sheet 2018
Quarterly Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Fact Sheet 2017
Annual Report 2016
Fact Sheet 2016
Subscription required - Subscription is required.

Aerial view:

Subscription required - Subscription is required.

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