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Australia
Duketon North Operation (Gloster Mine, Moolart Well Mine)

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

  Regional Office:
Level 1, 1 Alvan Street
Subiaco
Western Australia, Australia
WA 6008
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Carbon in leach (CIL)
  • Cyanide (reagent)
The Duketon North Operations (“DNO”) comprises the Moolart Well, Gloster, Dogbolter, Petra and Anchor pits with all ore processed through the Moolart Well processing plant.


Owners & OPERATOR

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

Deposit Type

  • Vein / narrow vein
  • Laterite


Summary:

Moolart Well.
Moolart Well is a blind gold deposit with several styles of gold occurring within the regolith profile. In transported regolith extending to 20m depth, a laterite zone is defined by a coherent subhorizontal gold blanket consisting of colluvial ironstone and pisolites in a clayey iron rich matrix. The laterite zone has an average thickness of 4m, extends over 5km N-S and 1km E-W and in some areas extends within 2m of the surface.

Below the laterite zone in the residual regolith is the oxide zone extending from 20m to 70m vertical depth with a similar lateral extent to the laterite zone.

Oxide mineralisation consists of numerous primary moderate to steep 60° east dipping gold bearing structures preserved in the clay rich residual profile and sub-horizontal supergene gold developed in the lower part of the profile. Host rocks for the oxide zone are a sequence of moderate to steep east dipping archaean mafic rocks, including basalt and dolerite sills, and ultramafic flow sequence, intruded by late stage high level diorite and quartz-diorite sills and dykes.

Gloster.
Gold mineralisation at Gloster is within a NW- SE trending, NE dipping shear zone and associated with flat to moderately NE dipping quartz veins hosted in intermediate intrusives. A 5m transported cover sequence conceals the gold mineralisation and weathering extends up to 100m depth. Intensive gold leaching has occurred in the uppermost 15m of the weathering profile.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mining method assumed in the Ore Reserve study is the same as that currently employed at the Moolart Well Gold Mine and the Gloster Gold Mine, which utilises drill and blast, excavator and truck open pit mining. The existing pit has been designed to be developed in a series of progressive cutbacks.


Crushing and Grinding


Processing

  • Carbon in leach (CIL)
  • Cyanide (reagent)

Source: Subscription required

Summary:

Duketon North Operations (“DNO”) comprises the Moolart Well, Gloster, Dogbolter, Petra and Anchor pits with all ore processed through the Moolart Well processing plant.

The Group has two reportable segments which comprise the Duketon Gold Project; being Duketon North Operations (“DNO”), currently comprising Moolart Well and Gloster and Duketon South Operations (“DSO”), currently incorporating Garden Well, Rosemont and Erlistoun. A number of new mining operations at satellite pits will commence in the next several years. In addition to Moolart Well and Gloster, DNO will include Dogbolter, Petra and Anchor pits as all will be processed through the Moolart Well processing plant. DSO will add Baneygo and Tooheys Well and the other satellite projects in that area to the Garden Well leaching circuit.

Recoveries & Grades:

CommodityParameter20192018201720162015
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 0.991.091.140.91.14
Subscription required - Subscription is required.

Production:

CommodityUnits20192018201720162015
Gold koz  ......  Subscription required  ......  Subscription required1017699
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 required2.98 Mt2.91 Mt
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required5,768,217 bcm4,371,317 bcm
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required2.92 Mt2.91 Mt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required3.9 3.2
Subscription required - Subscription is required.

Reserves at March 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 2.8 Mt Gold 0.88 g/t 79 koz
Probable 10.9 Mt Gold 1.01 g/t 354 koz
Proven & Probable 13.7 Mt Gold 0.99 g/t 433 koz
Measured 7.1 Mt Gold 0.8 g/t 183 koz
Indicated 37.4 Mt Gold 0.78 g/t 934 koz
Inferred 12.6 Mt Gold 0.69 g/t 280 koz
Total Resource 57.1 Mt Gold 0.76 g/t 1,398 koz

Commodity Production Costs:

CommodityUnits20192018201720162015
Cash costs Gold AUD  ......  Subscription required  ......  Subscription required 621 / oz 706 / oz 622 / oz
Total cash costs Gold AUD  ......  Subscription required  ......  Subscription required 697 / oz 778 / oz 686 / oz
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required  ......  Subscription required 785 / oz 934 / oz
Subscription required - Subscription is required.

Financials:

Units20192018201720162015
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 6.65  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 144.4  
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 54.5  
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 6, 2020
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Corporate Filings & Presentations:

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

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