Overview

Mine Type	Open Pit & Underground
Status	Active
Commodities	Gold
Mining Method	Truck & Shovel / Loader Longhole stoping
Backfill type	...
Production Start	...
Mine Life	...
Snapshot	Garden Well site is a part of Duketon South Operation. The Garden Well Operations include Garden Well open pits, Garden Well South underground mine, Tooheys Well, Russell’s Find and Erlistoun open pits, and Garden Well processing plant. Garden Well South Underground mine commenced commercial production during May 2023.
Related Asset

Deposit type

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

Summary:

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.

The approximate dimensions of the deposit are 2,100m along strike (N-S), 600m across (E-W), and 500m below surface.

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.

Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

Commodity	Units	2020	2019	2018	2017	2016	2015
Gold	koz	....	96	112	131	158	151

Operational metrics

Metrics	2020	2019	2018	2017	2016	2015
Ore tonnes mined	....	3.2 Mt	3.8 Mt	4.3 Mt	5.6 Mt	5.2 Mt

Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Dec 17, 2023
.......................	.......................		Dec 17, 2023
.......................	.......................		Dec 17, 2023
.......................	.......................		Dec 17, 2023

Employees	Year
......	2023
......	2022
......	2021
......	2020