Projects

Edna may

  • Ownership
    100%
  • Location
    350km east of  Perth, Western Australia, Australia
  • Year commenced operations
    • Edna May Gold Project development and construction 2009 - 2010
    • First gold pour April 2010
    • Commissioning of plant from May 2010
  • History
    3 historical mining phases:
    • 1950's: Historical mining - 356koz @ 19.5g/t gold UG stoping
    • 1985-1990: ACM Open Pit 274koz @ 1.7g/t gold
    • 1989-1992: ACM Open Pit decline development, limited stoping and then closure
    • 2009-2010: Catalpa Resources construct Edna May Plant
    • April 2010: Catalpa Resources first gold pour
    • 2011:  Evolution acquired 100% of Edna May via Catalpa Resources and Conquest Mining merging and the concurrent acquisition of Newcrest Mining's Cracow and Mt Rawdon gold mines.
  • Style of mineralisation
    Felsic intrusion hosted stockwork with high grade reef development
  • Contained metals
    Predominantly gold, with silver and tungsten
 
  • Measured, Indicated and Inferred Resources (at 31 Dec 2012)
    47.0Mt @ 1.1g/t gold for 1.6Moz gold ( including 1.21Mt @ 7.1g/t gold for 273koz - underground)
  • Ore Reserves (as at 31 Dec 2012)
    22.5Mt @ 1.0g/t gold for 0.71Moz gold
  • Mining Method
    Open pit
  • Gold Production
    FY2010A 10,222 ounces
    FY2011A 65,592 ounces
    FY2012A 73,264 ounces
    FY2013F 75,000 to 80,000 ounces
  • Processing Method
    Conventional crush-grind-CIL to produce gold dore
  • Nominal treatment rate
    2.6Mtpa
  • Forecast mine life
    9 years
  • Geology
    The Project is located near the northern end of the Westonia Greenstone Belt, in the Southern Cross Province of Western Australia's Archaean Yilgarn Craton. The Westonia Greenstone Belt comprises a series of outliers of predominantly amphibolite-grade metamorphic rocks extending approximately 100km WNW from near Edwards Find, south of Southern Cross. The remainder of the terrane comprises granitic rocks and their metamorphosed equivalents.

    The Edna May gold mineralisation consists of high-grade reef structures and associated stockwork veining hosted within three en-echelon tonalitic gneiss intrusions (Edna May, Greenfinch and Golden Point). The deposits are bound to the north and south by an ultramafic ampbibolite.
  • Mining
    Open pit mining is by conventional drill and blast, load and haul method. A bulk mining approach has been adopted to the extraction of remnant high-grade reef structures and associated stockwork mineralisation with a life-of-mine strip ratio of 1.9:1. This allows the mine to employ a single mining fleet (owner operated) for most of the mine life. The open pit is being mined in four stages and is carried out on 10 metre benches and 2.5 metre flitches.
  • Processing
    The process plant was purchased and transported from the Big Bell mine site to the Edna May site in 2007 and consists of a 2.0MW SAG mill and a 3.7MW Ball Mill along with other components necessary to provide a steady-state capacity of 2.6 million tonnes per annum.

    The process plant consists of a conventional carbon in leach (CIL) process and SABC FF (SAG mill Ball mill pebble Crusher Feed Forward) circuit. The ore is metallurgically consistent with a typical metallurgical recovery of approximately 92%.

    Initiatives to improve plan reliability, commenced in the June half 2012 and are positively impacting production performance in FY2013.

 

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