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Australia
Duketon South Operation (Erlistoun Mine, Garden Well Mine, Rosemont Mine)

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 Location:
81 km N from Laverton, Western Australia, Australia

  Regional Office:
Level 1, 1 Alvan Street, Subiaco
Perth
Western Australia, Australia
6008
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Fax+61-8-94-42-2290
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
The Duketon South Operations (“DSO”) includes the Garden Well, Rosemont, Erlistoun, Tooheys Well, Baneygo and other satellite projects in proximity to the Garden Well processing plant.


Owners & OPERATOR

Source: p. 90
CompanyInterestOwnership
Maca Ltd. (operator)
Regis Resources Ltd. 100 % Indirect
Duketon Resources Pty Ltd. 100 % Direct
Rosemont Gold Mines Pty Ltd. 100 % Direct

Deposit Type

  • Breccia pipe / Stockwork
  • Orogenic


Summary:

Rosemont.
Rosemont gold deposit is hosted in a quartz dolerite zone of a dolerite sill intruding ultramafic and argillaceous sedimentary units of the western limb of the Erlistoun Syncline in the Duketon Greenstone Belt.

Gold mineralisation is associated with brittle fracturing and quartz albite sericite carbonate sulphide alteration within the quartz dolerite. Most gold occurs below the weathered profile in saprock and fresh rock with the upper saprolite being leached of gold.

The mineralisation trends NNW over a strike length of 4.9km and dips steeply to the east and west, varying along strike.

Garden Well.
Garden Well is located on the eastern limb of the Erlistoun syncline of the Duketon Greenstone Belt. The gold of the Garden Well Deposit occurs as supergene mineralisation within upper Archaean regolith and as hypogene mineralisation in fresh rock. No significant amounts of gold occur in the transported quaternary clay sequence.

The gold is associated with intensely sheared and folded ultramafic and shale units that have been hydrothermally altered to a silica- carbonate-fuchsite-chlorite-pyrite-arsenopyrite assemblage, and underlying chert units.

The gold mineralisation trends roughly north- south over a distance of 2,100m and dips 50º to 60º east which is sub-parallel to the ultramafic-sediment contact.

Erlistoun.
Erlistoun is an Archaean orogenic gold deposit hosted in narrow quartz veins within sheared intermediate to felsic intrusions located on the eastern limb of the Erlistoun Syncline. The host units are bounded by a granodiorite on the east and adjacent to a dolerite and ultramafic unit to the west. Gold mineralisation is hosted in quartz veins and associated shear zones with high grade pods of gold mineralisation associated with weathering event horizons. Gold mineralisation trends N to NNE over a strike length of 1.9km and dips shallowly at 40° to the west.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mining method assumed in the Ore Reserve study is the same as that currently employed at the Rosemont, Garden Well and Erlistoun Gold Mines, which utilises drill and blast, excavator and truck open pit mining.


Crushing and Grinding


Processing

  • Gravity separation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Duketon South Operations (“DSO”) includes the Garden Well, Rosemont, Erlistoun, Baneygo and other satellite projects in proximity to the Garden Well processing plant.

Recoveries & Grades:

CommodityParameter20192018201720162015
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 1.41.241.11.081.1
Subscription required - Subscription is required.

Production:

CommodityUnits20192018201720162015
Gold koz  ......  Subscription required  ......  Subscription required223229211
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required7.81 Mt8.16 Mt
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required16,848,858 bcm19,324,571 bcm
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required7.34 Mt6.93 Mt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required5.4 5.9
Subscription required - Subscription is required.

Reserves at March 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 7.6 Mt Gold 0.89 g/t 219 koz
Probable 30.9 Mt Gold 1.37 g/t 1,359 koz
Proven & Probable 38.5 Mt Gold 1.27 g/t 1,578 koz
Measured 9.4 Mt Gold 0.87 g/t 263 koz
Indicated 98.6 Mt Gold 1.02 g/t 3,245 koz
Inferred 17.9 Mt Gold 1.04 g/t 599 koz
Total Resource 125.9 Mt Gold 1.01 g/t 4,108 koz

Commodity Production Costs:

CommodityUnits20192018201720162015
Cash costs Gold AUD  ......  Subscription required  ......  Subscription required 867 / oz 795 / oz 921 / oz
Total cash costs Gold AUD  ......  Subscription required  ......  Subscription required 940 / oz 867 / oz 987 / oz
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required  ......  Subscription required 1,017 / oz 924 / oz
Subscription required - Subscription is required.

Financials:

Units20192018201720162015
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 57.6  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 320.45  
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 81.6  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 6, 2020
....................... Subscription required ....................... Subscription required Subscription required Jan 6, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Annual Report 2016
Other 2011
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Aerial view:

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