Henty Gold Mine – Description
The Henty Gold Mine is an underground gold mine that commenced operation in 1996 and is located in glaciated mountainous terrain in the upper Henty Valley on the West Coast of Tasmania, adjacent to the Southwest Conservation Area. The nearest main towns are Rosebery, 10 kilometres to the north, Zeehan, 19 kilometres to the west and Queenstown, 23 kilometres to the south.
Henty lies within the mineral rich Mt. Read Volcanic Belt in Western Tasmania that hosts the Hellyer, Que River, Rosebery, Hercules and Mount Lyell base metal deposits. The eastern side of the belt is dominated by the Henty Fault which runs north-east for over 60 kilometres between Mount Charter and Mount Read. The Henty operation is based on a series of structurally complex high-grade zones of gold mineralisation that occur within a package of highly altered volcanic rock adjacent to the Henty Fault.
Access from surface to the series of orebodies at Henty is via shaft and decline, linked to a common portal exit. Mining methods used at Henty vary according to the ore body geometry and geotechnical characteristics of the ore body and host rock. The main mining methods are longhole bench stoping, transverse open stoping and flatbacking (cut and fill). Stopes are filled with either paste fill or mullock.
The process plant has an annual plant capacity of 300 kt/y and utilises a static grizzly, SAG mill, gravity circuit and conventional CIL plant.
Rehabilitation of selected areas disturbed by mineral exploration within the Henty lease commenced in 1993. Progressive rehabilitation associated with mine infrastructure was undertaken during and after construction, with works carried out in the vicinity of the administration office, process plant facilities, wetlands and settling ponds.