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Mungari mine, Australia

29th April 2016

By: Sheila Barradas

Creamer Media Research Coordinator & Senior Deputy Editor

  

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Name: Mungari mine.

Location: The Mungari mine is 600 km east of Perth and 20 km west of Kalgoorlie, in Western Australia.

Controlling Company: Evolution Mining.

Brief Description: The Mungari operation includes the Frog’s Leg and White Foil mines. The mine has a processing capacity of 1.5-million tonnes a year.

Brief History: The Frog’s Leg deposit was discovered in 1999. The mine was an openit operation until 2004/5 and then progressed to underground mining in 2007. Openpit mining restarted at the White Foil mine in mid-2014, following construction of the Mungari processing plant.

Evolution acquired the Mungari operation from La Mancha Group in August 2015.

Products: Gold.

Geology/Mineralisation: The White Foil and Frog’s Leg deposits are situated within the Norseman-Wiluna greenstone belt of the Yilgarn craton. White Foil lies 3 km to the west of the Mungari shear, a regional scale shear zone, and is hosted within a quartz-rich gabbro unit, which is part of the Powder Sill intrusive complex.

The Frog’s Leg deposit is located on the sheared contact between the porphyritic “cat rock” (regionally known as the Victorious Basalt) and volcaniclastic rocks of Black Flag beds.

Gold mineralisation at White Foil occurs in the quartz gabbro portion of a mafic sill that has intruded the volcaniclastic Black Flag sediments and is associated with quartz veining and stockwork veining. The mineralised zone is 70 m wide, 400 m long, and dips at between 50° to 60° and is open at depth.

The Frog’s Leg ore lodes occur at the steeply west-dipping sheared contact between the Black Flag volcaniclastics to the east and basalts to the west, with gold hosted in quartz veins and breccia. The ore lodes are between 2 m and 20 m thick and occur as subparallel lodes.

Reserves: Proven and probable reserves at the Mungari openpit mine as at December 31, 2014, were estimated at 6.79-million tonnes, grading 1.55 g/t of gold.

Proven and probable reserves at the Mungari underground mine as at December 31, 2014, were estimated at 2.53-million tonnes, grading 5.46 g/t of gold.

Resources: Mineral resources as at December 31, 2014, were 39.75-million tonnes, grading 2.06 g/t of gold.

Mining Method: Frog’s Leg is an underground operation using top-down bench stoping with paste fill.
White Foil is an openpit operation, using conventional drill- and-blast, load-and-haul methods.
Major Infrastructure and Equipment: The Mungari processing plant consists of three-stage crushing and ball milling, followed by conventional leaching.

The crushing plant currently has a 1.75-million-tonne a year capacity. Its design capacity is 1.5-million tonnes a year.

Prospects: Opportunities for reducing costs and improving productivity at Mungari continue to be identified and are expected to be realised over time.

Contact: Investor relations GM Bryan O’Hara.

Contact Details:
Evolution Mining,
tel +61 2 9696 2900,
fax +61 2 9696 2901, and
website http://www.evolutionmining.com.au.

Edited by Tracy Hancock
Creamer Media Contributing Editor

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