CRP SUPPLIES LUMP PHOSPHATE SAMPLES TO POTENTIAL CUSTOMER

NEWS RELEASE 25-013 July 21, 2025 CHATHAM SUPPLIES LUMP PHOSPHATE SAMPLES TO MALAYSIAN YELLOW PHOSPHORUS PRODUCER WELLINGTON New Zealand - Chatham Rock Phosphate Limited (TSXV: “NZP”, NZX: “CRP” and “3GRE” (Frankfurt) or the “Company”) is pleased to announce that it has once again advanced the future prospects of its Korella North Mine with the supply of lump phosphate samples to a yellow phosphorus producer in Malaysia. 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 Cayha Mata is the second sample sent to them and subject to further testing, negotiations for an offtake agreement will commence. The supply of samples to Malaysia follows the earlier supply of 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. Meanwhile, to further increase availability of lump phosphate from Korella North studies have commenced into briquetting of the phosphate fines that would normally be sold into the domestic market. A suitable source of carbon would be included in the briquettes to add further value since yellow phosphorus production requires carbon as a reductant. Currently in China some 20 per cent of the feed for yellow phosphorus plants are briquettes. China last year imported just under 4 million tonnes of phosphate, primarily for yellow phosphorus production. 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 strengthen its earnings base in the future. The three electric arc furnaces require an annual supply of 440,000 tonnes of lump phosphate. For further information contact: 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, including 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.