Australia

Duketon South Operation

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Categories

Overview

Mine TypeOpen Pit & Underground
StatusActive
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Longhole open stoping
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SnapshotThe Duketon South Operations (“DSO”) contain the Garden Well Gold Mine (open pit and underground), the Rosemont Gold Mine (open pit and underground), the Tooheys Well gold deposit, the Baneygo gold deposit, the Russells Find gold deposit, the Ben Hur gold deposit and other satellite projects, and Garden Well and Rosemont processing plants.

In 2023 site achieved a key milestone with commercial production declared at the Garden Well South underground mine (Garden Well underground mine).
Related AssetsGarden Well Mine, Garden Well South Mine, Rosemont Mine

Owners

SourceSource
CompanyInterestOwnership
Regis Resources Ltd. 100 % Indirect

Contractors

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Deposit type

  • Orogenic
  • Breccia pipe / Stockwork
  • Vein / narrow vein

Summary:

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.

Garden Well South
The geology of Garden Well South (GWS) UG consists of a sequence of folded sedimentary and volcanic rocks. The sequence can be differentiated into fine grained siltstones, lapilli and tuff volcaniclastics, sedimentary breccias, black shales, banded iron formation, chert, interbedded chert/shale and a footwall basalt unit. All of the units strike NNW at approximately 340-350o. Folding is tight and plunges approximately 20o to the SSE.

Primary mineralisation is present as pyrite beds and veinlets within the western limb of the syncline, hosted by siderite-altered chert. Mineralisation at GDW is strongly controlled by lithological rock type.

The maiden GWS UG MRE is estimated from the initial target zone at GWS and extends over 700m down plunge to a depth of 500 meters below natural surface.

Gold is hosted in a moderate east to steeply dipping shear zone trending N-S. Gold mineralisation within chert, shale and BIF is associated with brecciated zones including elevated sulphides and quartz veins.

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.

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.

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  ....  Subscribe275254223229211
All production numbers are expressed as metal in doré.

Operational metrics

Metrics202320222021202020192018201720162015
Annual milling capacity  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe7.5 Mt
Ore tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe6.98 Mt7.4 Mt7.48 Mt7.81 Mt8.16 Mt
Waste OP  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe21.3 Mbcm15,060,386 bcm17,783,273 bcm16,848,858 bcm19,324,571 bcm
Tonnes milled  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe6.45 Mt6.79 Mt6.83 Mt7.34 Mt6.93 Mt
Total tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe
Stripping / waste ratio  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe7.8 5.3 6.3 5.4 5.9

Production Costs

CommodityUnits2023202220212020201920182017
Cash costs Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe 791 / oz   751 / oz   867 / oz  
Total cash costs Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe 870 / oz   826 / oz   940 / oz  
All-in sustaining costs (AISC) Gold AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,021 / oz   932 / oz   1,017 / oz  

Financials

Units2023202220212020201920182017
Capital expenditures M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 114.8   58.7   46.6  
Revenue M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 491.4   428.9   372.2  
Operating Income M AUD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 192.3   177.2   127.5  

Heavy Mobile Equipment

Fleet data has not been reported.

Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 17, 2023
....................... Subscription required ....................... Subscription required Subscription required Dec 17, 2023
....................... Subscription required ....................... Subscription required Subscription required Dec 17, 2023
....................... Subscription required ....................... Subscription required Subscription required Dec 17, 2023

Aerial view:

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