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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 2, 516 Hay Street
Subiaco
Western Australia, Australia
6008
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  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Crush & Screen plant
  • Gravity separation
  • Carbon in leach (CIL)
  • Cyanide (reagent)
Mine Life2028
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.
Latest NewsMACA receives contract extension from Regis Resources at Duketon North     May 3, 2022


Owners

Source: p. 87
CompanyInterestOwnership
Regis Resources Ltd. 100 % Indirect

Deposit Type

  • Mesothermal
  • Vein / narrow vein
  • Intrusion related


Summary:

Moolart Well.
Moolart Well, as part of the DNO, is a mesothermal gold deposit hosted dominantly in intermediate diorite intrusives but also in dolerite, basalt and to some degree ultramafic rock types. Hypogene gold mineralisation is structurally controlled in fresh rock and to a lesser extent in oxidised rock. Competency contrasts between rock types are thought to pay a major role in providing the architecture in which mineralisation occurs. The gold is associated with multiple local moderate to steep east dipping N-S striking structures. These are offset by a series of NW- SE striking post to syn-mineralisation structures which are also partly mineralised.

Deflation and lateritisation of the extant profile are responsible for accumulating a significant portion of the Moolart Well mineralisation into the overlying transported laterite regolith. Remobilisation of gold in the weathered residual profile has depleted the upper parts of the clay zone and enhanced the gold grade of the lower part of the profile in the saprock zone.

A model of the lithology and weathering was generated prior to the mineralisation domain interpretation commencing. The mineralisation geometry has a very strong relationship with the lithological interpretation and structure in both the laterite and the oxide/fresh mineralisations. The updated Reserve for Moolart Well includes numerous open pits, including the addition of three new mining areas (Buckingham, Eindhoven and Mitchell).

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 Ore Zone is defined by a coherent sub-horizontal 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 20 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.

The approximate dimensions of the deposit are 5,000m along strike (N-S), 700m across (E-W) for both laterite and oxide/fresh. The laterite mineralisation extends 25m maximum from surface, and the oxide/fresh mineralisation has been drilled up to 430m below surface.

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.

The approximate dimensions of the deposit are 1,200m along strike (NNW-SSE), 500m across (ENE- WSW), and 250m below surface.


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

  • Crush & Screen plant
  • Gravity separation
  • 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 plant design is based on a nominal 3Mtpa throughput rate utilising single stage crushing circuit and single ball mill followed by gravity and carbon in leach circuits.

Recoveries & Grades:

CommodityParameter202020192018201720162015
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required94949192
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required1.091.140.91.14

Production:

CommodityUnits202020192018201720162015
Gold koz  ......  Subscription required  ......  Subscription required1071017699
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Ore tonnes mined  ......  Subscription required3.16 Mt3.15 Mt3.37 Mt2.98 Mt2.91 Mt
Waste  ......  Subscription required6.82 Mbcm5,074,235 bcm7,768,536 bcm5,768,217 bcm4,371,317 bcm
Tonnes milled  ......  Subscription required2.98 Mt3.26 Mt2.95 Mt2.92 Mt2.91 Mt
Stripping / waste ratio  ......  Subscription required4.4 2.9 4.5 3.9 3.2
Subscription required - Subscription is required.

Reserves at December 31, 2020:
Resources are reported at cut-off grade of 0.4 g/t Au.
Reserves are reported at cut-off grades not less than 0.3 g/t Au, that vary according to oxidation and lithology domains.

CategoryTonnage CommodityGradeContained Metal
Proven 3 Mt Gold 0.4 g/t 40 koz
Probable 18 Mt Gold 0.8 g/t 430 koz
Proven & Probable 21 Mt Gold 0.7 g/t 470 koz
Measured 8 Mt Gold 0.8 g/t 190 koz
Indicated 33 Mt Gold 0.7 g/t 800 koz
Inferred 14 Mt Gold 0.7 g/t 340 koz
Total Resource 55 Mt Gold 0.8 g/t 1,340 koz

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs Gold AUD  ......  Subscription required  ......  Subscription required 649 / oz 621 / oz 706 / oz 622 / oz
Total cash costs Gold AUD  ......  Subscription required  ......  Subscription required 718 / oz 697 / oz 778 / oz 686 / oz
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required  ......  Subscription required 827 / oz 785 / oz 934 / oz
Subscription required - Subscription is required.

Financials:

Units202020192018201720162015
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required19   18.4   19   6.6  
Revenue M AUD  ......  Subscription required  ......  Subscription required175.6   170.1   124.7   144.4  
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required84.4   80.7   30.3   54.5  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2021
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....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2021
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2020

Corporate Filings & Presentations:

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

News:

NewsDate
MACA receives contract extension from Regis Resources at Duketon North May 3, 2022

Aerial view:

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