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Mount Gibson, Australia, slashes its annual sales forecast after rockfall shuts down the Koolan Island Mine

Mount Gibson, Australia, slashes its annual sales forecast after rockfall shuts down the Koolan Island Mine

Mount Gibson Iron retracted its fiscal 2026 guidance on Friday, after determining that it was not viable to resume its mining operations at Koolan Island in Western Australia following a large rockfall earlier in the month.

Iron ore miner estimated sales between 3 and 3.2 million wet-metric tons (WMT), at A$80 - A$85 FOB for each WMT shipped.

The firm's shares fell by 27.7%, to A$0.34, and are set for the weakest trading session they have experienced since December 2014. Stocks fell to their lowest level since July.

The company stated that it has decided not to remediate the affected pit area because of safety risks, the possibility of further instability, and the mine's remaining limited life. Since the rockfall on October 16, mining has been suspended, but no one was injured.

The company stated that "resuming mining was not feasible due to the safety risks associated with potential future instability, and the time and investments required to mitigate these risks in light of the limited remaining life of the mine."

The processing will continue with existing ore stocks, and 75 employees will be retained on site for rehabilitation work.

The transition costs are estimated to be between A$30 and A$40 Million ($19.49 to $25.99 millions).

The incident will not affect the company's plan to purchase a 50% stake in Central Tanami Gold Project before March 2026. Some Koolan Island staff and equipment will be relocated there. ($1 = 1.5389 Australian dollars) (Reporting by Jasmeen Ara Shaikh in Bengaluru; Editing by Alan Barona)

(source: Reuters)