Australia

Savage River UG Project

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Categories

Overview

Mine TypeUnderground
StageFeasibility
Commodities
  • Iron Ore
Mining Method
  • Block caving
  • Sub-level caving
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Mine Life... Lock
SnapshotMining operations in Savage River Tasmania mine comprise two active open pits, North and Centre Pits. North Pit is approximately 360 metres in depth.

The strategic rationale for the underground project is to ensure the sustainability of the mine; reduce the long-term mining cost; decrease carbon emissions; reduce environmental impact; increase profitability and extend the life of the mine. The underground mining option was assessed against the alternative of deepening the existing North Pit.

Board decision for Grange to move forward with execution planning and permitting over 2024 with final construction decision in the second half of 2024.
Related AssetSavage River

Owners

SourceSource
CompanyInterestOwnership
Grange Resources Ltd. 100 % Indirect
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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Deposit type

  • Metamorphic

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.

The magnetite ores comprise three volumetrically important groups: pyritic ores, ores associated with serpentine and talc-carbonate ores. The ore may be massive, layered, or disseminated and range from being fine-grained to coarsely crystalline. Accessory mineral phases may include talc, tremolite, actinolite, chlorite, epidote, apatite and carbonate in varying amounts. The mineral assemblages preserved at Savage River imply middle to upper green-schist facies metamorphic conditions.

Dimensions
• The Savage River orebodies occur discontinuously over a strike length of 6km with thickness ranging from 40-150m.
• All lenses remain open at depth.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

CommodityUnitsLOM
All production numbers are expressed as concentrate.

Operational metrics

Metrics
Annual ore mining rate  ....  Subscribe
Ore tonnes mined, LOM  ....  Subscribe
* According to 2024 study.

Production Costs

CommodityUnitsAverage
C1 cash costs Iron Ore AUD  ....  Subscribe
Assumed price Iron Ore AUD  ....  Subscribe
* According to 2024 study / presentation.

Operating Costs

Currency2024
UG mining costs ($/t milled) AUD 13 *  
* According to 2024 study.

Project Costs

MetricsUnitsLOM Total
Total CapEx $M AUD  ......  Subscribe

Heavy Mobile Equipment

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Personnel

Mine Management

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 17, 2024
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....................... Subscription required ....................... Subscription required Subscription required Jun 17, 2024
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Aerial view:

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