Mt Carlton

  • Evolution Ownership
  • Location
    150km south of Townsville, Queensland, Australia
    Location on the traditional lands of the Birriah People
  • Local Communities
    Gumlu, Home Hill, Bowen, Townsville
  • Year commissioned operations
    Comercial production commenced July 2013
  • History
    • 2006: Discovery
    • Feb 2010: Definitive Feasibility Study completed
    • Dec 2010: Conquest Board approves A$126.9M development
    • Nov 2011: Evolution acquired 100% of Mt Carlton via Catalpa Resources and Conquest Mining merging and the concurrent acquisition of Newcrest Mining's Cracow and Mt Rawdon gold mines
    • Dec 2012: Construction completed and commissioning commenced
    • Mar 2013: First concentrate produced
    • Apr 2013: Official mine opening
    • Jul 2013: Commenced commercial production
  • Style of mineralisation
    High-sulphidation epithermal
  • Contained metals
    Gold, silver, copper
  • Measured, Indicated and Inferred Resources (at 31Dec 2013)
    V2: 11.4Mt @ 2.5g/t Au, 22g/t Ag and 0.27% Cu for 932koz Au, 8.18Moz Ag and 31kt Cu (1.19Moz AuEq)
    A39 : 0.9Mt @ 197g/t Ag and 0.33% Cu for 5.20Moz Ag and 2kt Cu
  • Ore Reserves (as at 31 Dec 2013)
    V2: 7.30Mt @ 3.0g/t Au; 22g/t Ag; 0.28% Cu for 705koz Au, 5.04Moz Ag, 20.3kt Cu (870koz AuEq)
    A39 : 0.67Mt @ 209g/t Ag; 0.38% Cu for 4.53Moz Ag, 2.6kt Cu
  • Mining Method
    Open pit
  • Gold Production
    FY2014A 87,952 gold equivalent ounces
    FY2015F 65,000-72,500 gold equivalent ounces
  • Processing Method
    Crushing, grinding and bulk sulphide flotation to produce a polymetallic concentrate
  • Nominal treatment rate
    Design capacity of 800ktpa
  • Current mine life
    12 years
  • Geology
    The Mt Carlton project is a high-sulphidation epithermal style deposit with mineralisation occurring within felsic volcanic rocks on the northern margin of the Permian Bowen Basin. The project comprises gold, silver and copper primarily as copper arsenic sulphides (enargite) and silver arsenic sulphides (tetrahedrite/polybasite) and some native gold (within pyrite).

    The Mt Carlton deposit comprises two discrete zones: the large gold dominant V2 deposit and the smaller, silver rich A39 deposit. The V2 deposit is flat lying and situated 20 metres to 180 metres below surface and is 70 metres thick with a 500 metre by 500 metre areal extent. The two deposits are located 200 metres apart.

    The stratigraphy in the Mt Carlton area is almost flat lying with a gentle 10 degree southerly dip. Sulphide veins dipping at moderate to steep angles to the NW host a majority of the known economic mineralisation.
  • Mining
    Following the completion of the A39 open pit in FY14, mining production is now derived solely from the V2 open pit, utilising conventional drill and blast, load and haul methodologies. Mining equipment is contracted under a dry-hire arrangement and is operated by Evolution employees, mining 5 metre benches in 2.5 metres flitches.

    The V2 pit will have a life-of-mine strip ratio of 2.7:1 and will be mined over nine years. The low-grade ore will be stockpiled and processed after depletion of the high-grade ore, to be processed post completion of open pit mining.
  • Processing
    Ore is processed via conventional technology, consisting of crushing, grinding and flotation to produce a polymetallic concentrate. 
  • Fact Sheet
    Mt Carlton fact sheet - last updated February 2015