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Australia
Iron Knob Mine

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 Location:
50 km NW from Whyalla, South Australia, Australia

  Regional Office:
Level 28, 88 Phillip Street
Sydney
New South Wales, Australia
2000
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeStockpile
Commodities
  • Iron (hematite)
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life6.5 years (as of Jan 1, 2020)
Iron Knob Mining Area (IKMA) includes the Iron Monarch and Iron Princess pits (East Princess and West Princess) and Monarch scree pits.

After a period of renewed mining (2013 – 2018) SIMEC temporarily ceased mining operations at the Iron Knob Mining Area (IKMA) and placed the mine sites into care and maintenance in July 2018. Recovery of low-grade stockpiles through the Integrated Processing Facility continues, with the upgraded ore shipped to Whyalla using the existing rail line.

The SIMEC Mining is going to recommencement of mining operations at Iron Monarch scree pit.


Owners

Source: p. 18
CompanyInterestOwnership
Gupta Family Group ("GFG") Alliance 100 % Indirect
SIMEC Mining (operator) 100 % Direct
Tenement holder and operator - OneSteel Manufacturing Pty Ltd (operating as SIMEC Mining). SIMEC Mining is a business of OneSteel Manufacturing Pty Ltd which is a company in the GFG Alliance.

Contractors

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Deposit Type

  • Alluvial / Placer
  • Banded iron formation
  • Metamorphic
  • Stratabound


Summary:

The Iron Knob mining area (IKMA) lies at the northern end of the Middleback Ranges (MBR).

• Hosted within the Palaeoproterozoic Hutchison Group metasediments.
• Mineralization is within the Lower Middleback Iron Formation grades upwards from Carbonate Haematite to Jaspilite Haematite facies.
• Ore Formation is considered through passive supergene enrichment of Magnetite Banded Iron Formations.
• Strongest Enrichment within the LMIF Carbonate Facies – leading to complete replacement of carbonates in highest grade zones.
• The Metasediments have a history of complex deformation dominated by East – West compression.
• Mineralised zones are bounded to the East and West regional scale North – South Shear Zones.
• Multiple Stages of Archean amphibolite dykes cross cut both deposits and are influence on mineralisation and Geotechnical Parameters.

Middleback Ranges Hematite
Hematite in the MBR occurs as stratabound Palaeoproterozoic deposits of the Lower Middleback Iron Formation (LMIF), part of the Hutchison Group. The Hutchison Group forms part of the Cleve Subdomain of the Gawler Craton, and lies on its western edge. The Cleve Subdomain comprises tightly folded high-grade metamorphic rocks that are mainly derived from marine shelf sediments and mafic and acidic volcanics (Parker, 2012b).

Middleback Ranges Framework In the MBR, the Hutchison Group is composed of the Warrow Quartzite and the Middleback Subgroup. ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Operations throughout the reporting period (FY 2020) continued the recovery and processing of low-grade stockpiles through the Integrated Processing Facility (IPF) and deposition of tailings into the Monarch void as approved under PEPR 2017/004.

SIMEC Mining placed the IKMA operations into care and maintenance on 1 July 2018. The decision to suspend operations at IKMA was a result of high production costs and ongoing low iron ore prices and part of SIMEC’s overall business response to this business environment. It was envisaged that mining operations would re-commence at some point following a sustained increase in the price of iron ore to a point at which the mine again becomes economically advantageous to operate.

While other areas of the IKMA are in a care and maintenance phase, SIMEC Mining are proposing to undertake scree mining operations.

Mining of scree ore will supply feed to SIMEC’s Integrated Processing Facility (IPF). Current (2020) IPF feed is from reclamation of historic low-grade dumps. The scree ore will supplement the low-grade feed and on depletion of stocks, will replace the low-grade feed altogether. During Monarch Scree mining operations, feed to the IPF is expected to be approximately 135 wet mass kilotonnes per month. A significant stockpile of IPF feed (approximately 100 kilotonnes) will be maintained, in order to feed the processing facility during times of mining cessation, due to detrimental weather conditions or ot ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits20212020
Iron (hematite) t  ......  Subscription required ^  ......  Subscription required
All production numbers are expressed as lump & fines. ^ Guidance / Forecast.
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Operational Metrics:

Metrics20212020
Tonnes processed  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
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Reserves at December 31, 2020:

CategoryTonnage Commodity
Probable 13.1 Mt Iron (hematite)
Proven & Probable 13.1 Mt Iron (hematite)
Indicated 40.1 Mt Iron (hematite)
Measured & Indicated 40.1 Mt Iron (hematite)
Inferred 21.6 Mt Iron (hematite)
Total Resource 61.7 Mt Iron (hematite)



Heavy Mobile Equipment as of February 7, 2021:
HME TypeModelQuantityStatus
Bulldozer ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Dozer ....................... Subscription required ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Loader (FEL) ....................... Subscription required ....................... Subscription required Existing
Truck (haul) ....................... Subscription required ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 25, 2022
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Apr 25, 2022
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Apr 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 25, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
Year-end Mineral Reserves 2015
Corporate Presentation 2013
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