Komori
Occurring Fact1515Nittetsu Mining Co.,Ltd.Energy Resources

Update on Previously Disclosed Matter: Delay in Expected Start of Production at the Arqueros Mining Development Project

It has become clear that the start of copper concentrate production at the Arqueros Mining Development Project will be delayed from the previously scheduled period of July to September 2026 due to damage to roads and bridges caused by heavy rainfall and delays in the permitting procedures for receiving electricity. The new expected production start date is currently under review.

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Delay in the expected start of production at the Arqueros Mining Development Project due to heavy rainfall and other factors

Target Locations / Products

The Arqueros Mine in the Republic of Chile and the plant that produces copper concentrate from ore

This disclosure09/04/2026
Cause

Intermittent rainfall continued in August, causing washouts, bridge damage and other issues on public roads that disrupted the transport of materials, equipment and personnel, while the permitting procedures with the relevant administrative authorities concerning the receipt of electricity took longer than anticipated

Related procedures

Type

Permitting procedures with the relevant administrative authorities concerning the receipt of electricity

Court or authority

Local administrative authorities

Impact on Earnings Forecast

The impact on the financial results of the Company's group is currently under review. If the Company determines that the matter will have a material impact on its financial results, it will disclose the information promptly.

Outlook

Temporary restoration work on the public roads has been completed, and transport capacity has improved from its previous level. Discussions with the administrative authorities regarding the permitting procedures have progressed, and steady progress is being made toward completing the procedures. The expected production start date is currently under review, and the Company will disclose it promptly once confirmed.

Planned follow-up disclosure

The Company will disclose the expected production start date promptly once it is confirmed.

Event that occurred
ItemDetails
Event nameDelay in the expected start of production at the Arqueros Mining Development Project due to heavy rainfall and other factors
Target Locations / ProductsThe Arqueros Mine in the Republic of Chile and the plant that produces copper concentrate from ore
CauseIntermittent rainfall continued in August, causing washouts, bridge damage and other issues on public roads that disrupted the transport of materials, equipment and personnel, while the permitting procedures with the relevant administrative authorities concerning the receipt of electricity took longer than anticipated
Impact on Earnings ForecastThe impact on the financial results of the Company's group is currently under review. If the Company determines that the matter will have a material impact on its financial results, it will disclose the information promptly.
Type of litigation or proceedingPermitting procedures with the relevant administrative authorities concerning the receipt of electricity
Court or authorityLocal administrative authorities
OutlookTemporary restoration work on the public roads has been completed, and transport capacity has improved from its previous level. Discussions with the administrative authorities regarding the permitting procedures have progressed, and steady progress is being made toward completing the procedures. The expected production start date is currently under review, and the Company will disclose it promptly once confirmed.
Planned follow-up disclosureThe Company will disclose the expected production start date promptly once it is confirmed.
Items this document does not state (17)
Date of occurrenceDate recognized / date notice receivedSubject EntityAmount of Impact on Business PerformanceAccounting period in which recognizedPlaintiffDefendantDate 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.

Intermittent rainfall continued in August, causing washouts and bridge damage on public roads leading to the Arqueros Mine, and transport capacity for materials, equipment and personnel had not fully recovered. In addition, the permitting procedures required to receive electricity for plant operations have taken longer than anticipated.

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Update on Previously Disclosed Matter: Delay in Expected Start of Production at the Arqueros Mining Development Project | Nittetsu Mining Co.,Ltd. (1515) timely disclosure | Komori