File: '\\swfile\EmailIn\20250908 144220 Attachment REV3-Chatham Invited to Tender for Supply of Lump Phosphate V3.docx'

Error! Unknown document property name.

Error! Unknown document property name.

Error! Unknown document property name.

59057-1\#5509420v1

Error! Unknown document property name.

Error! Unknown document property name.

Error! Unknown document property name.

NEWS RELEASE 25-017 September 8, 2025

CHATHAM INVITED TO TENDER FOR SUPPLY OF LUMP PHOSPHATE

WELLINGTON New Zealand - Chatham Rock Phosphate Limited (TSXV: "NZP", NZX: "CRP" and "3GRE" (Frankfurt) or the "Company") confirms that it has further advanced the future prospects of its Korella North Mine with a recent invitation from Cahya Mata to tender for supply of lump phosphate to this yellow phosphorus producer in Malaysia.

The invitation to tender results from the positive test results of the lump phosphate samples provided in two tranches over the last two years. Tender submissions are required by 18 September 2025.

Background

The Malaysian phosphate producer Cahya Mata Phosphates is based in Sarawak and utilises abundant sustainable hydroelectric power in its three electric arc furnaces. With the three furnaces in full operation Cahya Mata Phosphates has a demand for 440,000 tonnes per annum of lump phosphate.

The plants produce Yellow Phosphorous, Technical Grade Phosphoric Acid and Food Grade Phosphoric Acid (to be used as feedstock for animal feed, fertiliser and other products), with an annual production capacity of 48,000 Metric Tons (MT), 75,000 MT and 60,000 MT respectively.

The recent sample sent to Cahya Mata is the second sample sent to them. The supply of samples to Malaysia follows the earlier supply of similar lump phosphate samples to a yellow phosphorus producer in China.

The initial Karumba export facility is planned to handle some 200,000 tpa of lump phosphate with the product being transported by road train from the Korella North Mine to an area at Karumba to be leased from Ports North.

About Yellow Phosphorus

Yellow phosphorus, also referred to as P4, is used as the base to produce Thermal Grade Phosphoric Acid/Purified Phosphoric Acid that is used in the manufacture of lithium-iron-phosphate batteries.

About Cahya Mata Phosphates Industries Sdn Bhd

Cahya Mata Phosphates Industries Sdn Bhd (also referred to as Cahya Mata Phosphates), formerly known as Malaysian Phosphate Additives (Sarawak) Sdn Bhd, is the first integrated phosphate complex in Malaysia.

The plant is located strategically opposite Samalaju Port in Samalaju Industrial Park and will increase the Group's footprint across the Sarawak Corridor of Renewable Energy (SCORE), as well as strengthening its earnings base in the future.

Chris Castle

President and Chief Executive Officer

Chatham Rock Phosphate Limited

64 21 55 81 85 or chris@crpl.co.nz

Statements about the Company's future expectations and all other statements in this press release other than historical facts are "forward looking statements". Such forward-looking statements are based on numerous assumptions, and involve known and unknown risks, uncertainties and other factors, current market conditions, and risks inherent in mineral exploration and development, which may cause the actual results, performance, or achievements of the Company to be materially different from any projected future results, performance, or achievements expressed or implied by such forward-looking statements.

Neither the TSX Venture Exchange, its Regulation Service Provider (as that term is defined under the policies of the TSX Venture Exchange), or New Zealand Exchange Limited has in any way passed upon the merits of the above described transaction, and has neither approved nor disapproved of the contents of this press release.