Name of the Mine
Koolan Island mine.

Location  
In the Buccaneer Archipelago 140 km north of Derby, in Australia.

Mine Owner/s  
Mount Gibson.

Brief Description  
The Koolan Island mine is Mount Gibson’s flagship operation, and has the status of being Australia’s highest-grade direct shipping hematite iron-ore operation.

Brief History  
Mount Gibson acquired Koolan Island through the takeover of Aztec Resources in 2007.

Primary Metals/Minerals  
Iron-ore.

Secondary Metals/Minerals  
Silicon, aluminium and phosphorous.

Geology/Mineralisation  
Kooln Island’s mineralised zone is an overturned enriched haematitic sandstone horizon within the Yampi Sandstone Member, unconformably overlying the Elgee Siltstone. It is between 12 m and 30 m thick, and dips 55° to 80° to the south.

Reserves  
Total ore reserves as at June 30, 2022, were estimated at 16-million tonnes grading 64.5% iron, 4.79% silicon oxide, 0.85% aluminium oxide and 0.013% phosphorous.

Resources  
Total mineral resources as at June 30, 2022, were estimated at 44.7-million tonnes grading 63.6% iron, 7.71% silicon oxide, 0.61% aluminium oxide and 0.013% phosphorous.

Mining Method  
Conventional drill/blast and load/haul with an excavator and large openpit mining equipment.

Major Infrastructure/Equipment  
Koolan Island includes crushing facilities, which were upgraded in 2021. The upgrade comprised the construction of a new run-of-mine, ore-retaining wall, a feed bin, jaw and cone crushers, and screening circuits.

Prospects  
Mining is continuing to plan, allowing for the continued build-up of substantial high-grade iron-ore stockpiles.

Contact Details
Mount Gibson
Tel +61 8 9426 7500
Email admin@mtgibsoniron.com.au

Sources
Mount Gibson. Website: https://www.mtgibsoniron.com.au/
Mount Gibson. MGX Minerals resources and ore reserves (June 30, 2022).
Mount Gibson. Macquarie – Western Australia Forum Presentation (November 30, 2022).
Mount Gibson. Report for the quarter ended December 31, 2022 (January 30, 2023).