Overview
| Status | Closing / Closed |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Open stoping
- Longitudinal stoping
|
Underground mining at Murrawombie recommenced in December 2015 following closure of the adjacent North East and Larsen’s mine. Mining crews and equipment were progressively transferred from North East and Larsen’s underground mines to the Murrawombie underground mine development. |
Contractors
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Summary:
The North East and Larsens Mines are located 5 km north of Murrawombie.
Copper mineralisation at the North East Mine is hosted by weakly chlorite altered and silicified schist in a massive to banded pyrite – chalcopyrite lens that dips moderately to the east.
A higher grade core to the mineralisation is continuous across strike and plunge having a strike approximately 100 m and a width of 10 m.
Economic mineralisation strike is in the order of 175 m with a horizontal width averaging 30 m. The deposit is open at depth and resources, limited only by drilling.
Copper sulphide mineralisation, primarily chalcocite, at the adjacent Larsens Mine is hosted by weakly chlorite altered schist in three discrete, massive to banded pyrite – chalcopyrite lenses that dip steeply to the east and plunge moderately to the south – east. The central lens is the largest defined to date and comprises two sub parallel lenses each several metres thick with strike lengths of 40m.
The deposit is open at depth with very limited drilling. Mining operations have recommenced to establish underground drilling positions for resource extension.
Mining Methods
- Open stoping
- Longitudinal stoping
Summary:
Mining at the North East Decline is undertaken using longitudinal open stoping with partial rock fill, currently at a rate of 480,000 tpa. North East Decline ore is trucked to the processing plant at Tritton.
Mine Design Criteria
- Declines and Cross cuts 5.5 mH x 5.5 mW
- Decline gradient 1:7
- Decline curvature 15 m
- Decline standoff 40 m
- Decline access Hartmans pit
- Ore drives 5.0 mH x 5.0 mW
- Level interval 20 metres
Source:
Summary:
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Operational Metrics:
| Metrics | 2017 |
|
Annual processing capacity
| 1.8 Mt |
Reserves at December 31, 2015:
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Proven & Probable
|
65 kt
|
Copper
|
1.4 %
|
1 kt
|
|
Measured & Indicated
|
340 kt
|
Copper
|
1.5 %
|
5 kt
|
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