Evolution Ownership

350km east of  Perth, Western Australia, Australia

Local Communities
Westonia, Merredin and all communities within 100km of the Edna May operations site

Year commenced operations

  • Edna May Gold Project development and construction 2009 – 2010
  • First gold pour April 2010
  • Commissioning of plant from May 2010

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
  • 1993: Westonia Mines Pty Ltd purchases Edna May from ACM Gold Pty Ltd
  • 2002: Westonia Mines Limited IPO
  • 2008: Westonia Mines Limited changes name to Catalpa Resources Ltd
  • 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 2016)
19.4Mt @ 1.36g/t gold for 848koz gold

Ore Reserves (as at 31 Dec 2016)
8.22Mt @ 1.61g/t gold for 426koz gold

Mining Method
Open pit

Gold Production
FY2010A 10,222 ounces
FY2011A 65,592 ounces
FY2012A 73,264 ounces
FY2013A 86,216 ounces
FY2014A 80,165 ounces
FY2015A 98,766 ounces
FY2016A 71,028 ounces
FY2017A 70,188 ounces

Processing Method
Conventional crush-grind-CIL to produce gold dore

Nominal treatment rate

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 amphibolite.

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. A portal was established and rehabilitation of an underground decline commenced in June 2016 to access higher grade lodes beneath the planned limits of the open pit.

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%.

Environmental Permit
Licence L8422/2010/2

Fact Sheet
Edna May fact sheet – updated May 2017