Hosted within metamorphosed meso-Proterozoic age volcano-sedimentary rocks and intrusive dolerites of the Eastern Fold Belt of the Mt Isa Inlier. Dominated by dilational brecciated shear zones containing coarse patchy to massive primary mineralisation, with high-grade supergene chalcocite enrichment and bonanza-grade coarse native copper in oxide. Structures hosting mineralisation are sub-parallel, east-southeast striking and steeply dipping. The observed mineralisation, and alteration, exhibit ffinities with Iron Oxide-Copper-Gold (IOCG) style deposits. Polymetallic copper-cobalt-gold mineralisation, and significant magnetite, persists from the surface, through the oxidation profile, and remains open at depth.

The Rocklands copper-cobalt-gold mineralisation is hosted in a series of subparallel, east south east trending, steeply dipping zones. Mineralised lodes occur within a metamorphosed sedimentary succession of siltstone, sandstone/quartzite, quartz magnetite/jaspilite lenses, calcareous beds and calc-silicates of Proterozoic age. Copper is the dominant mineralisation at Rocklands, lesser amounts of cobalt and gold. Copper mineralisation extends from surface to depth with overlapping oxide, secondary and primary styles of copper mineralisation. Mineralisation appears to be associated with and controlled by steeply dipping, west northwest trending, linear, structures that cut the shallow dipping metasedimentary sequence at a high angle.

Copper mineralisation extends from surface and is open at depth with overlapping oxide, secondary and primary styles. Primary sulphide mineralisation occurs at the base of a thick secondary mineralisation sequence of native copper and chalcocite with a minor complete oxidation zone.

The planned mining method for Rocklands is a conventional open pit truck and shovel operation, using 180t and 190t class hydraulic excavators, in backhoe configuration, and 90t dump trucks. Drilling and blasting is conducted on 10 m high benches. Digging is conducted on flitches of 2.5 m height in the ore and up to 5 m high in bulk waste blocks. CuDeco currently owns and operates its own Mining fleet. Proposals for a ‘Dry Hire’ Leased Fleet have been sought and are currently being assessed to compare costs with current fully owned and maintained fleet.

The Fixed Crushing Plant was initially installed with the following equipment:
- Grizzly screen
- Jaw crusher
- Two rolls crushers
- Various screens and conveyors.

The Process Plant installed at Rocklands consists of:
- A high pressure grinding roll (HPGR)
- A rotary scrubber (de-agglomerator)
- Classifying screens
- Jigging circuit, consisting of coarse, intermediate and fine jig circuits
- Spiral separation, consisting of rougher and scavenger spirals
- Table separation, consisting of rougher and cleaner tables
- Two belt filters, to filter fine native copper product from spirals and tables
- Five thickeners (gravity, copper concentrate, pyrite (cobalt) concentrate, magnetite concentrate and tailings thickeners)
- Ball mill and cyclones
- Copper flotation, consisting of roughing, regrinding, cleaning, scavenging and re-cleaning
- Pyrite (cobalt) flotation, consisting of roughing, cleaning and re-cleaning
- Magnetic separation, consisting of roughing, regrinding, cleaning