Overview
| Status | Closing / Closed |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
|
The development of the access decline to Avoca Tank commenced in mid-October 2021 and by end of the financial year was approximately 70% complete. The decline starts from a portal which was previously used to access the North-East and Larsens mines. |
Source:
p. 12
Contractors
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Summary:
Regionally the mineralisation is hosted within early Ordovician sediments as part of the
Girilambone metasedimaents. The Larsens mineralisation is hosted within with the Pelitic to Psammite sediments, and sparse zones of courser sandstones of the Girilambone Group.
The Larsens sulphide mineralisation is stratiform and is classified as a “Besshi style” volcanogenic massive sulphide. Mineralisation is dominated by massive pyrite – chalcopyrite, with minor banded to stringer pyrite – chalcopyrite, and sparse locally important magnetite chalcopyrite.
Structurally the Larsens sulphide mineralisation is hosted within a corridor of moderate to intense shearing related to a thrust fault observed in the east wall of the Eastern Shear of the Murrawombie Pit (Murrawombie pit is located approximately 4 km SW of the Larsens mineralisation). The shear corridor has been traced by Sirotem (geophysical exploration tool) to the north west of the Murrawombie pit, with the Larsens mineralisation sitting Hanging Wall to the Eastern Shear, in relatively un-deformed sediments.
Summary:
Open pit mining of the near surface oxide portion of the Larsons deposit was completed prior to 2002 by the Girilambone Copper Company.
The mine plans assume the use of up-hole bench stoping with sub-level developed at 20m vertical intervals. Rib pillars are to be left in sub economic areas of mineralisation. There is no backfill required.
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
|
272 kt
|
Copper
|
2.5 %
|
7 kt
|
|
Measured & Indicated
|
460 kt
|
Copper
|
2.6 %
|
12 kt
|
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