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Occurring Fact1515Nittetsu Mining Co.,Ltd.Energy Resources

[Update on Disclosed Matter] (Arqueros Mine Development Project) Notice Regarding Progress on Initiatives Toward the Start of Production

Although some temporary sections remain on the road to the Arqueros Mine damaged by torrential rains, it has been restored to a condition that allows the transport of equipment, materials and personnel without disruption, and plant construction is progressing. The production start date remains under review, but the Company is aiming to commence production within the fiscal year ending March 2027.

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Progress in efforts to commence production under the Arqueros Mine Development Project

Subject Entity

Nittetsu Mining Co.,Ltd. and its group companies

Target Locations / Products

Arqueros Mine, production plant and public road to the mine

This disclosure10/07/2026
Cause

Damage to the public road to the Arqueros Mine caused by torrential rains

Impact on Earnings Forecast

The impact on the performance of the Group is currently under review. If the Company determines that the impact will be material, it will disclose the information promptly.

Outlook

The Company will continue efforts aimed at commencing production within fiscal 2026 (the fiscal year ending March 2027). The specific production start date will be disclosed promptly once the outlook becomes clear.

Event that occurred
ItemDetails
Event nameProgress in efforts to commence production under the Arqueros Mine Development Project
Subject EntityNittetsu Mining Co.,Ltd. and its group companies
Target Locations / ProductsArqueros Mine, production plant and public road to the mine
CauseDamage to the public road to the Arqueros Mine caused by torrential rains
Impact on Earnings ForecastThe impact on the performance of the Group is currently under review. If the Company determines that the impact will be material, it will disclose the information promptly.
OutlookThe Company will continue efforts aimed at commencing production within fiscal 2026 (the fiscal year ending March 2027). The specific production start date will be disclosed promptly once the outlook becomes clear.
Planned follow-up disclosureThe specific production start date will be disclosed promptly once the outlook becomes clear.
Items this document does not state (18)
Date of occurrenceDate recognized / date notice receivedAmount of Impact on Business PerformanceAccounting period in which recognizedType of litigation or proceedingCourt or authorityPlaintiffDefendantDate of filing / date of actionClaim amount / surcharge amountAmount of receivables at risk of non-collection or delayed collectionSuspended operationsScheduled resumption dateInvestigation structureMeasures to prevent recurrenceDirectors' and officers' liabilityVoting rights ownership percentage before the changeVoting rights ownership percentage after the change

These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.

The reasons the company gives

The company's own explanation, not something inferred from the numbers.

This is because the Company continues to maintain and repair the road, including its temporary sections, following damage to public roads caused by torrential rains. The production start date is being reviewed based on progress in plant construction, power reception and trial operations, among other factors.

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[Update on Disclosed Matter] (Arqueros Mine Development Project) Notice Regarding Progress on Initiatives Toward the Start of Production | Nittetsu Mining Co.,Ltd. (1515) timely disclosure | Komori