150km south of Townsville, Queensland, Australia
Location on the traditional lands of the Birriah People
Gumlu, Home Hill, Bowen, Townsville
Year commissioned operations
Comercial production commenced July 2013
Style of mineralisation
Gold, silver, copper
Measured, Indicated and Inferred Resources (at 31 Dec 2017)
11.89Mt @ 2.80/t gold for 1,056koz gold
Ore Reserves (as at 31 Dec 2017)
4.50Mt @ 4.92g/t gold for 712koz gold
FY2014A 87,952 gold ounces
FY2015A 77,658 gold ounces
FY2016A 113,056 gold ounces
FY2017A 105,024 gold ounces
Crushing, grinding and bulk sulphide flotation to produce a polymetallic concentrate
Nominal treatment rate
Design capacity of 800ktpa
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.
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. Evolution transitioned to owner-miner in 2015.
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.
Ore is processed via conventional technology, consisting of crushing, grinding and flotation to produce a polymetallic concentrate.
Environmental Authority EPML00982113
Mt Carlton fact sheet – updated May 2017