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:
    • 1. Historical mining (1950s) 356koz @ 19.5g/t gold UG stoping ;
    • 2. ACM Open Pit (1985 -1990  274koz @ 1.7g/t gold ACM open pit; and
    • 3. ACM Open Pit (1989 -1992) 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 30 June 2011)
    52.9Mt @ 1.1g/t gold for 1.8Moz gold
  • Ore Reserves (as at 30 June 2011)
    28.3Mt @ 1.1g/t gold for 1.0Moz gold
  • Mining Method
    Open pit with near-term potential for underground mining feasibility study underway
  • Gold Production
    FY2010A 10,222 ounces
    FY2011A 65,592 ounces
    FY2012F 85,000 to 93,000 ounces
    FY2013F 115,000 to 125,000 ounces
  • Processing Method
    Conventional crush-grind-CIL to produce gold dore
  • Nominal treatment rate
    2.8Mtpa
  • 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 is hosted within three en echelon tonalitic gneiss intrusions, namely Edna May, Greenfinch and Golden Point. The deposits are bound to the north and south by an ultramafic ampbibolite.
  • Mining
    Open pit mining is carried out by a conventional drill and blast, load and haul method. The open pit mine has a low life of mine strip ratio of 1.9:1.0 which 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.

    A bulk mining approach has been adopted to include the extraction of the majority of the Edna May Gneiss which hosts remnant high grade reefs and associated stockwork.

    These high grade reef structures are the target of current drilling programmes beneath the final pit limits with the aim of establishing a concurrent underground operation to supply high grade feed to the Edna May processing plant.
  • 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 2.0kW SAG mill and a 3.7kW Ball Mill along with other components necessary to provide processing capacity of 2.8Mtpa with an upgrade to 3.1Mtpa planned in FY2012.

    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%.

    The mine and processing schedule will allow average annual gold production of more than 100,000 ounces recovered over its nine year mine life.

 


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