150km south of Townsville, Queensland, Australia
Location on the traditional lands of the Birriah People
Year commissioned operations
Construction completed March 2013
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
Gold, silver, copper
Measured, Indicated and Inferred Resources (at 31Dec 2012)
V2: 25.2Mt @ 1.7g/t Au, 19g/t Ag and 0.24% Cu for 1.35Moz Au, 15.1Moz Ag and 59.7kt Cu
A39 : 2.7Mt @ 178g/t Ag and 0.12% Cu for 15.49Moz Ag and 3.1kt Cu
Ore Reserves (as at 31 Dec 2012)
V2: 9.13Mt @ 2.8g/t Au; 22g/t Ag; 0.27% Cu for 0.81Moz Au, 6.46Moz Ag, 24.8kt Cu
A39 : 1.04Mt @ 265g/t Ag; 0.24% Cu for 8.85Moz Ag, 2.5kt Cu
FY2014F 65,000-75,000 gold equivalent ounces
Crushing, grinding and bulk sulphide flotation to produce a polymetallic concentrate
Nominal treatment rate
Design capacity of 800ktpa
Current mine life
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 andis 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 production is derived from two pits, V2 and A39, 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 A39 pit will have a life-of-mine strip ratio of 3.3:1. 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 will be processed via conventional technology, consisting of crushing, grinding and flotation to produce a polymetallic concentrate. Project construction activity was successfully completed during the year and commissioning activities of all key components of the processing plant commenced at the end of December 2012. First concentrate production commenced in the March 2013 quarter, with 12,138 ounces of gold equivalent production during the year. The first concentrate shipment was dispatched on 15 May 2013.