Australia

Duketon North Operation

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Overview

Mine TypeOpen Pit
StatusActive
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start... Lock
Mine Life... Lock
SnapshotDuketon North Operations (DNO) comprises the Moolart Well, Gloster and Dogbolter pits with all ore processed through the Moolart Well processing plant.

The majority of open pit mining at DNO will continue at the Moolart pits until they come to the end of their current Reserves in the December quarter 2023. Open pit mining will continue in the Gloster pit until all open pit mining ceases at DNO in the June quarter 2024. Following completion of open pit mining, mill feed will be sourced solely from lower grade stockpiles.
Related AssetMoolart Well Mine

Owners

SourceSource
CompanyInterestOwnership
Regis Resources Ltd. 100 % Indirect

Contractors

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Deposit type

  • Mesothermal

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.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

Milling equipment has not been reported.

Processing

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Production

CommodityUnits202320222021202020192018201720162015
Gold koz  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe881071017699
All production numbers are expressed as metal in doré.

Operational metrics

Metrics202320222021202020192018201720162015
Stripping / waste ratio  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe4.4 2.9 4.5 3.9 3.2
Ore tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe3.16 Mt3.15 Mt3.37 Mt2.98 Mt2.91 Mt
Waste  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe6.82 Mbcm5,074,235 bcm7,768,536 bcm5,768,217 bcm4,371,317 bcm
Tonnes milled  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe2.98 Mt3.26 Mt2.95 Mt2.92 Mt2.91 Mt
Total tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe

Production Costs

CommodityUnits2023202220212020201920182017
Cash costs Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe 903 / oz   649 / oz   621 / oz  
Total cash costs Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe 981 / oz   718 / oz   697 / oz  
All-in sustaining costs (AISC) Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,055 / oz   827 / oz   785 / oz  

Financials

Units2023202220212020201920182017
Capital expenditures M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 24.4   19   18.4  
Revenue M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 161   175.6   170.1  
Operating Income M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 57.9   84.4   80.7  

Heavy Mobile Equipment

Fleet data has not been reported.

Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2024
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2024
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2024
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2024
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2024

Aerial view:

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