Overview
Stage | Production |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Production Start | ... |
Mine Life | 2035 |
Savage River consists of North Pit and Centre Pit and one previously mined pit (South Deposit) which is not yet planned to be mined as part of the Life Of Mine Plan.
A Definitive Feasibility Study (DFS) for underground mining is in progress and a declaration of an underground Ore Reserve has not yet been made. This is dependent on the outcomes of the DFS and integration with the open pit mining schedules. |
Source:
p. 28
Grange Resources Ltd. indirectly owns 100% interest in the Savage River mine through it's wholly owned subsidiary Grange Resources Tasmania Ltd.
Contractors
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Summary:
The Savage River magnetite deposit lies within and near the eastern margin of the Proterozoic Arthur Metamorphic Complex in north western Tasmania. This complex is exposed along a northeast-southwest trending structural corridor, the Arthur Lineament, which separates Proterozoic sedimentary rocks to the northwest from a variety of Palaeozoic rocks to the southeast.
The magnetite deposits at Savage River represent the largest of a series of discontinuous lenses that extend in a narrow belt for some 25 kilometres south of the Savage River Township. The deposit is subdivided into sections on the basis of areas that have been mined. The areas are referred to as North Pit, South Lens, Centre Pit, and South Deposit.
Magnetite ore is almost entirely enclosed within a highly sheared and strike-faulted belt of mafic and ultramafic rocks specifically serpentinite and talc-carbonate schist. The magnetite ranges in thickness from 40 to 150 metres in width and is termed the Main Ore Zone (MOZ).
Narrow (<20metre) lenses and layers also occur in the mafic sequence to the west. The mafic sequence comprises chlorite-calcite-albite schist and layered green amphibole-chlorite-albite schist.
A suite of late, strongly deformed metabasalt and metadolerite intrusive dykes occur either subparallel to or cut obliquely across the MOZ. Vein magnesite occurs adjacent to the MOZ with significant bodies developed in the east at South Lens and at the west in Nort ........
Summary:
The mine comprises three principal open pits - North, Central and South Pits - Oriented north-south covering a 4km strike length and separated by unmined zones of thin or low grade material. Centre Pit is separated from North Pit by the Savage River which runs through a pillar area left to retain the river channel. The pits average 100-150m in depth - the proposed cut back and extensions will deepen them by up to a further 250m.
Mining activities in the open pit involve the use of conventional off - highway rear-dump trucks and hydraulic excavators, with drilling and blasting being used to prepare the ground ahead of mining. Grade control sampling is conducted on all blast holes within the orebody, as well as on selected holes around the periphery.
Mining is undertaken by conventional bulk mining methods utilizing hydraulic face shovels, dump trucks and conventional drill and blast, which is suited to the local terrain.
The overall pit slopes used for the design and optimisation are based on geotechnical studies undertaken in the Feasibility Study and are reviewed and updated on an annual basis as part of Grange Resource’s Life Of Mine Planning process.
The Smallest Mining Unit (SMU) assumed is 5 m x 5 m x 2.5 m in the X, Y and Z direction consistent with the sub-cell resolution in the resource.
Mining widths of 20m are applied to the pit designs based on the current primary load and haul equipment’s minimum working requi ........
Source:
Source:
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Flow Sheet:
Summary:
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Pipelines and Water Supply
Source:
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Production:
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Operational Metrics:
Metrics | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
Ore tonnes mined
| ...... | ...... | ...... | 2,108,370 bcm | 1,050,067 bcm | 1,193,821 bcm |
Total tonnes mined
| ...... | ...... | ...... | 14,462,931 bcm | 14,730,697 bcm | 12,461,515 bcm |
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Reserves at December 31, 2022:
Savage River Ore Reserve and Mineral Resource Estimate:
• Elemental compositions were measured from Davis Tube Concentrate;
• Cut-off grade: 15% DTR:
• Stockpiles were included in this summary table.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade |
Proven
|
69 Mt
|
DTR
|
49.3 %
|
Proven
|
69 Mt
|
Iron
|
68.1 %
|
Probable
|
27.7 Mt
|
DTR
|
40.1 %
|
Probable
|
27.7 Mt
|
Iron
|
67.5 %
|
Proven & Probable
|
96.7 Mt
|
DTR
|
46.7 %
|
Proven & Probable
|
96.7 Mt
|
Iron
|
67.9 %
|
Measured
|
173 Mt
|
DTR
|
51.5 %
|
Measured
|
173 Mt
|
Iron
|
67.9 %
|
Indicated
|
172.6 Mt
|
DTR
|
41.8 %
|
Indicated
|
172.6 Mt
|
Iron
|
68.1 %
|
Inferred
|
139.4 Mt
|
DTR
|
37.4 %
|
Inferred
|
139.4 Mt
|
Iron
|
68.8 %
|
Total Resource
|
485 Mt
|
DTR
|
44.5 %
|
Total Resource
|
485 Mt
|
Iron
|
68.3 %
|
Corporate Filings & Presentations:
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