Peak Gold Mines is a gold and copper mine underground which located in the Cobar Gold Field of Central West New South Wales, Australia, and began production in 1992. Peak Gold Mines produces gold dore for sale at the Perth mint and copper concentrate is sold to markets in Asia.
The Peak, New Occidental and Perseverance ore body are is accessed via a shaft and surface reduction in peak site. The new Cobar and Chesney ore body are accessed via a decline near the base of the new Cobar open pit. The Peak site is the processing plant and administration building.
At peak, Perseverance, New Occidental and New Cobar, do mining by using a bench stoping. If Chesney, a combination of bench stoping and open stoping is planned mining proceeds from bottom to top in each panel. Drifts are driven along strike to the ore at any level, developed a slot and ore is blasted into the cavity. Ore is extracted and waste rock is used to backfill the void.
Peak Gold Mines in Cobar mining area, located about 600 kilometers northwest of Sydney and eight kilometers south of the town of Cobar in New South Wales (NSW), Australia. The property is of Sydney over 700 kilometers of highway and eight and a half kilometers of secondary and private roads. Limited resources are available at Cobar and generally available in Dubbo 300 kilometers east. The mines are operated by Peak Gold Mines Pty Ltd ( “PGM”), a subsidiary of the Company
Goldmines’ climate is semi-arid and average rainfall is about 416 millimeters per year. The landscape is mostly flat, consisting of sandy plains with small waves. The mine is named after the “peak”, a small conical hill 324.3 meters above sea level, which has the peak deposit located on its southern base. The vegetation at the mine consists largely of semiarid low forest, with little seasonal creeks and rivers lined by taller eucalypt species.
The Cobar mining area is along the eastern margin of the Early Devonian age Cobar Basin, which lies in the northern part of the central belt of the Lachlan Orogen, and will of the regional scale Rookery Fault system.
The Peak Gold Mines operation is located in a 10-kilometer section of Rookery fault system, referred to as the “Peak mine corridor.” until today, five separate gold-copper deposits were developed in underground mines. Listed from south to north, they include: Perseverance, Peak, New Occidental, Chesney and New Cobar.
A sixth deposit, Great Cobar which was mined from around the time of the first world war until the mid-1940s, is located at the northern end of the peak-floor and provides an area of renewed exploration focus.
Individual deposits occur as steeply dipping veins with equally short strike lengths (less than 300 meters), narrow widths (10 to 30 meters) and long vertical dimensions. For example, the peak and Perseverance have defined deposits to vertical depths of 500 to 700 meters. The Chesney and New Cobar deposits are currently being defined by shorter vertical areas and like all of the deposits along the Peak mine corridor remain open at depth.
Mineralization of polymetallic sulphides consisting of gold-copper vary -lead-zinc assemblages at peak and Perseverance to simpler copper-gold in New Cobar, Chesney and Great Cobar. Generally, gold mineralization occurs as discrete lenses within broader envelopes of base metal mineralization.
Including commercial mine production from Great Cobar and the resurgence of mining in 1991, the Peak Mines corridor produced over 3.7 million ounces of potential gold and 200 million pounds of copper.
Processing Of Mineral Ores
Ore from Peak, Perseverance and New Occidental underground is crushed and hoisted onto a surface stockpile and eventually into the mill feed conveyor SAG. Ore from New Cobar and Chesney is dragged tip, where it is fed to the SAG mill feed conveyor via a separate container.
Gold and silver are recovered in a gravity circuit with Knelson concentrators, further concentrated in an intensive leach reactor electrolytically and mud in a gas-fired furnace smelted to gold doré bars produce. Gold, silver and copper are obtained as copper concentrate in a conventional flotation circuit.
The flotation concentrate is thickened, dewatered and stockpiled prior to the stage of the process to transporting to the smelter. A third method of gold and silver recovery by cyanidation in a tank leach circuit. The resulting sludge is smelted into gold dore bars. Metal recoveries are approximately 90% and 87% for gold and copper.
Exploration Potential In Peak Gold
Since the beginning of commercial production in 1991, underground exploration to the known ore body along the Peak corridor added to new reserves again, its for replace annual production.
For example, with a mineral reserve of 936,000 ounces of gold in the Peak deposit in 1991 begin to sustainable exploration and development mining reserves substitute has of the end in the delineation of mineral reserves and resources amounting to almost three times that amount as of the end of 2014.
With a twenty-year track record of successful reserves replacement and control of more than 75 kilometres of prospective geology along the greater Rookery fault trend, exploration at Peak continues to offer significant upside toward future exploration success.