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 is comprised of gold, silver and copper. Later andesitic volcaniclastics overlies a rhylotic sequence which in turn underlies a package of sediments and conglomerates. Mineralisation is structurally controlled which is exclusively hosted within the advanced argillic altered rhyodacite. Discrete and discontinuous steeply dipping ENE trending breccia dominated quartz - sulphosalt infilled veins form high grade bonanza lodes. Paragenetically, the sulphosalts replace sphalerite and galena which are associated with late stage copper sulphides. Coarse gold occurs as small grains (0.1 mm) at quartz-sulphide infill contacts and in sulphosalts. Basaltic/doleritic dykes which mirror pre existing structures cross cut mineralisation.

Mining production is derived solely from the V2 deposit following the completion of the silver rich A39 deposit in FY14. The V2 deposit is flat lying and situated 20m to 180m below surface and is 70m thick with a 500m by 500m areal extent. Mining is by conventional drill and blast, load and haul methodologies, mining 5m benches in 2.5m flitches.

3 x Caterpillar 777F dump trucks
1 x 1200 excavator, 2 x Caterpillar 980 loaders
1 x Cat D10N
1 x Caterpillar 14M grader, 1 x 773 water truck
2 x Panterra 1500, 1 x Panterra 1100, 1 x Atlas Copco L8

Ore treatment / processing method/s:Crushing, grinding and bulk sulphide flotation to produce a polymetallic concentrate.

Primary crushing/grinding plant/ machinery:Single stage crushing, single toggle jaw 1,067mm x 760mm, feed size 500mm, produce size P80 120mm.

Grinding plant equipment: Single SAG mill (7.32m x 3.8m EGL) with 32,000kW installed power, steel lined, 22 x 20mm discharge grates, 2 x 50mm pebble ports, trommel grate discharge with trommel screen, classification Warman Cavex 400mm cyclones.

Mineral liberation plant/equipment:Flotation circuit consists of 6 x Metso RCS 40 cells (Rougher/Scavengers) & 9 x Metso RCS 5 cells (cleaners), 2 x IsaMill M500 (regrind mill).

Mineral recovery plant/equipment:Delkor concentrate thickener (8.0m), 2 x concentrate storage tanks, Outotec LAROX Pf1052 filter press, Delkor tailings thickener (14.0m).

Process pumps:Majority of process pumps Warman, split casing. Cyclone feed pumps Warman 1500EE-MCU. Tails pumps Warman 4/3DD-AH.

Chemical/reagents used:PAX (Potassium Amyl Xantrhate), DSP009 (Thionocarbonate collector), frother, flocculant, lime.

Final product storage handling:2 tonne capacity bulk storage bags are filled with filtered concentrate via a materials handling screw. Bags are transported to Townsville storage facility to await shipment.