Overview
Stage | Production |
Mine Type | Open Pit |
Commodities |
- Copper
- Cobalt
- Gold
- Magnesium
|
Mining Method |
|
Production Start | ... |
Mine Life | 2026 |
CuDeco Ltd. suspended the Rocklands mine on 31 August 2018 and put it on care & maintenance.
The Rocklands mine was put into receivership in 2019 after the collapse of its owner CuDeco Limited.
Copper Resources Australia acquired the Rocklands site located 17km north of Cloncurry in December 2020 and has undergone an intense re-commissioning phase and mining operations has recently recommenced. |
Source:
Contractors
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Summary:
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 mineral ........
Summary:
The 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.
Four Waste Dumps have been approved by the Department of Environmental and Heritage Protection (DEHP), East, West, North & South. Initial waste haulage is to the East and West Waste Dumps. As the pits get deeper these dumps are completed and haulage moves to the North and South dumps reducing the haul distances. Capacity of the combined dumps will meet the requirements for all currently planned pits.
Source:
Source:
Summary:
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Production:
Commodity | Units | 2017 |
Copper
|
t
| 26,956 |
All production numbers are expressed as metal in concentrate.
Operational Metrics:
Metrics | 2017 |
Ore tonnes mined
| 843,908 t |
Tonnes processed
| 897,388 t |
Reserves at December 31, 2017:
Cut-of grade at 0.1% Cu.
Category | Tonnage | Commodity | Grade | Contained Metal |
Measured
|
38.4 Mt
|
Copper
|
0.66 %
|
558 M lbs
|
Measured
|
38.4 Mt
|
Cobalt
|
305 g/t
|
|
Measured
|
38.4 Mt
|
Gold
|
0.14 g/t
|
174 koz
|
Measured
|
38.4 Mt
|
Magnesium
|
5.5 %
|
|
Measured
|
38.4 Mt
|
Copper Equivalent
|
0.9 %
|
|
Indicated
|
16.3 Mt
|
Copper
|
0.59 %
|
213 M lbs
|
Indicated
|
16.3 Mt
|
Cobalt
|
255 g/t
|
|
Indicated
|
16.3 Mt
|
Gold
|
0.16 g/t
|
86 koz
|
Indicated
|
16.3 Mt
|
Magnesium
|
4.3 %
|
|
Indicated
|
16.3 Mt
|
Copper Equivalent
|
0.8 %
|
|
Inferred
|
0.6 Mt
|
Copper
|
0.6 %
|
8 M lbs
|
Inferred
|
0.6 Mt
|
Cobalt
|
232 g/t
|
|
Inferred
|
0.6 Mt
|
Gold
|
0.21 g/t
|
4 koz
|
Inferred
|
0.6 Mt
|
Magnesium
|
2.7 %
|
|
Inferred
|
0.6 Mt
|
Copper Equivalent
|
0.8 %
|
|
Total Resource
|
55.4 Mt
|
Copper
|
0.64 %
|
779 M lbs
|
Total Resource
|
55.4 Mt
|
Cobalt
|
290 g/t
|
|
Total Resource
|
55.4 Mt
|
Gold
|
0.15 g/t
|
264 koz
|
Total Resource
|
55.4 Mt
|
Magnesium
|
5.1 %
|
|
Total Resource
|
55.4 Mt
|
Copper Equivalent
|
0.9 %
|
|
Financials:
| Units | 2017 |
Revenue
|
M AUD
|
79.6
|
Gross profit
|
M AUD
|
-6.4
|
After-tax Income
|
M AUD
|
-135.6
|
Corporate Filings & Presentations:
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