Rio Tinto details $733m mine spend in October 6-K

Rio Tinto plc and Rio Tinto Limited furnish a Form 6-K summarising multiple stock exchange and media announcements made in October 2025.

Rhea-AI Filing Summary

Rio Tinto plc and Rio Tinto Limited furnish a Form 6-K summarising multiple stock exchange and media announcements made in October 2025. The exhibits include notices on total voting rights and issued capital, several disclosures of shareholdings by persons discharging managerial responsibility and key management personnel, and various substantial holder notices. One announcement states that the Robe River Joint Venture will invest $733 million to extend the West Angelas iron ore mine in Western Australia, highlighting a significant capital project in the iron ore business. Other exhibits cover board changes, notifications of the issue and cessation of unquoted equity securities, publication of a prospectus, and a media release on launching a battery swap truck trial fleet at the Oyu Tolgoi mine with China’s State Power Investment Corporation.

Insights

Mining & capital allocation analyst

6-K bundles routine governance updates with a sizeable mine investment.

This Form 6-K groups together a series of October 2025 announcements from Rio Tinto. Most exhibits relate to standard corporate housekeeping: total voting rights, board changes, movements in substantial holdings, and notifications of issues or cessations of unquoted equity securities. These are typical for a large dual-listed miner and mainly ensure transparency around ownership and governance.

The stand-out item is the Robe River Joint Venture plan to invest $733 million to extend the West Angelas iron ore mine in Western Australia. That points to ongoing commitment to sustaining iron ore production capacity, although this excerpt does not quantify expected volume or cost impacts. Another notable exhibit is the launch of a battery swap truck trial fleet at the Oyu Tolgoi mine with China’s State Power Investment Corporation, signalling interest in operational innovation and electrification. Overall, the mix of items looks consistent with ongoing operations rather than a change in the company’s strategic direction.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does Rio Tinto (RTNTF) disclose in this October 2025 Form 6-K?

The Form 6-K from Rio Tinto plc and Rio Tinto Limited compiles October 2025 stock exchange announcements and a media release, covering capital structure updates, substantial holder notices, board changes, a major mine investment, and a prospectus publication.

What major investment is highlighted for Rio Tinto (RTNTF) in October 2025?

One exhibit states that the Robe River Joint Venture will invest $733 million to extend the West Angelas iron ore mine in Western Australia, indicating a substantial capital project in Rio Tinto’s iron ore portfolio.

What governance and shareholding updates does Rio Tinto (RTNTF) include?

The exhibits include notices on total voting rights and issued capital, several disclosures of shareholdings of persons discharging managerial responsibility / key management personnel, and multiple Form 603, Form 605, and TR-1 notices related to substantial holdings.

Does the Rio Tinto (RTNTF) Form 6-K mention board or management changes?

Yes. One stock exchange announcement is titled “Rio Tinto Board changes”, indicating that board-level changes were disclosed during October 2025, although this excerpt does not provide further detail.

What does the Form 6-K say about Rio Tinto’s capital markets activity?

Among the exhibits is an announcement titled “Publication of Prospectus”, as well as multiple Appendix 3G and Appendix 3H notifications covering the issue, conversion, payment up, or cessation of unquoted equity securities.

What technology initiative at Oyu Tolgoi is referenced for Rio Tinto (RTNTF)?

A media release in the exhibits is titled “Rio Tinto and China’s State Power Investment Corporation launch batter swap truck trial fleet at Oyu Tolgoi mine”, highlighting a trial of battery swap truck technology at the Oyu Tolgoi operation.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 11/03/2025 - 04:19 PM Learn about SEC filing dates

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2025

Commission file number: 001-10533			Commission file number: 001-34121
Rio Tinto plc			Rio Tinto Limited
			ABN 96 004 458 404
(Translation of registrant’s name into English)			(Translation of registrant’s name into English)
6 St. James’s Square			Level 43, 120 Collins Street
London, SW1Y 4AD, United Kingdom			Melbourne, Victoria 3000, Australia
(Address of principal executive offices)			(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F ☒ Form 40-F ☐

EXHIBITS

99.1Stock Exchange announcement dated 1 October 2025 entitled ‘Total Voting Rights and Issued Capital’.

99.2Stock Exchange announcement dated 2 October 2025 entitled ‘Shareholdings of persons discharging managerial responsibility (PDMR) / Key Management Personnel (KMP)’.

99.3Stock Exchange announcement dated 3 October 2025 entitled ‘Shareholdings of persons discharging managerial responsibility (PDMR) / Key Management Personnel (KMP)’.

99.4Stock Exchange announcement dated 3 October 2025 entitled ‘Appendix 3Y – Change of Director’s Interest Notice’.

99.5Stock Exchange announcement dated 5 October 2025 entitled ‘Form 603 – Notice of initial substantial holder’.

99.6Stock Exchange announcement dated 7 October 2025 entitled ‘Robe River Joint Venture to invest $733 million to extend West Angelas iron ore mine in Western Australia’.

99.7Stock Exchange announcement dated 8 October 2025 entitled ‘Appendix 3G – Notification of issue, conversion or payment up of unquoted equity securities’.

99.8Stock Exchange announcement dated 8 October 2025 entitled ‘Appendix 3H – Notification of cessation of securities’.

99.9Stock Exchange announcement dated 8 October 2025 entitled ‘Form 603 – Notice of initial substantial holder’.

99.10Stock Exchange announcement dated 9 October 2025 entitled ‘Appendix 3G – Notification of issue, conversion or payment up of unquoted equity securities’.

99.11Stock Exchange announcement dated 9 October 2025 entitled ‘Form 605 – Notice of ceasing to be a substantial holder’.

99.12Stock Exchange announcement dated 10 October 2025 entitled ‘TR-1: Standard form for notification of major holdings’.

99.13Stock Exchange announcement dated 22 October 2025 entitled ‘Shareholdings of persons discharging managerial responsibility (PDMR) / Key Management Personnel (KMP)’.

99.14Stock Exchange announcement dated 24 October 2025 entitled ‘Rio Tinto Board changes’.

99.15Media release dated 27 October 2025 entitled ‘Rio Tinto and China’s State Power Investment Corporation launch batter swap truck trial fleet at Oyu Tolgoi mine’.

99.16Stock Exchange announcement dated 31 October 2025 entitled ‘Publication of Prospectus’.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on their behalf by the undersigned, thereunto duly authorised.

Rio Tinto plc						Rio Tinto Limited
(Registrant)						(Registrant)
By			/s/ Andrew Hodges			By			/s/ Tim Paine
Name			Andrew Hodges			Name			Tim Paine
Title			Company Secretary			Title			Company Secretary
Date			3 November 2025			Date			3 November 2025