500 km northwest of Brisbane, Queensland, Australia
Year commenced operations
850koz gold produced from 1932 to 1992
Exploration over 5 years delineated the Royal and Crown deposits (2.4 Mt Inferred Mineral Resource at 10.1g/t gold for 790koz gold)
Cracow Mining JV Agreement executed Sep-2003 and development commenced
In 2002, joint venture participants approved development of the underground mine and refurbishment and upgrading of the existing treatment plant. Mine development commenced in December 2003 with first gold production in November 2004.
During 2011, Evolution acquired 100% of Cracow via Catalpa Resources and Conquest Mining merging and the concurrent acquisition of Newcrest Mining's Cracow and Mt Rawdon gold mines.
Conventional crush-grind-CIL to produce gold-silver dore
Nominal treatment rate
Forecast mine life
The gold mineralisation occurs in steeply dipping low sulphidation epithermal fissure quartz veins. High-grade gold mineralisation defined in the project resources occurs within five deposits (Royal Shoot, Crown Shoot, Sovereign Shoot, Klondyke North and Kilkenny Shoot), each developed at the intersection of major structures.
The Royal extends over a strike length of approximately 350 metres, the Crown is approximately 300 metres in strike length and the Sovereign has a strike length of 150 metres. The ore bodies average approximately 5 metres in width.
Underground mining is carried out by a mining contractor, managed by Evolution. A review has highlighted a cost benefit to transition to owner-mining. The changeover is planned to occur on 1 July 2013. The underground orebodies are accessed from a decline using the open stoping mining method with downhole sub-level benching with waste backfilling. A number of initiatives have commenced to improve mine productivity levels including the upgrade of the primary ventilation system to re-establish access to the lower Kilkenny orebody and the addition of resources to the mining fleet.
Ore is free milling and is treated on site by conventional crush-grind-CIP processing to produce gold-silver- dore. The processing plant treated 527,000 tonnes and a throughput capacity of 550,000 tonnes is expected to be acheived during FY2013.