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Location: 81 km N from Laverton, Western Australia, Australia
Level 2, 516 Hay StreetP.O. Box 862, WA 6904PerthWestern Australia, Australia6008
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Garden WellGarden 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 SouthThe 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.RosemontRosemont 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.Within the fresh rock, the mineralisation is hosted within quartz (+/- carbonate +/- pyrite +/- galena) vein stockwork exclusively within the quartz dolerite.ErlistounErlistoun 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.In FY2024, Regis identified and commenced the development of Garden Well Main and the extension of Rosemont underground.Garden Well MainThe geology of Garden Well Main underground 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 the units strike NNW at approximately 340-350o. Folding is tight and plunges approximately 20 o to the SSE. Primary mineralisation is present as pyrite beds and veinlets within the western limb of the syncline, hosted by sideritealtered chert.
