Australian explosives company Dyno Nobel will sell its 769,000 t/yr Phosphate Hill fertilizer plant to Australian energy and resources company Mayfair's wholly owned subsidiary Ryowa II GPS for up to A$100mn ($70mn), the company said today.
The finalisation of the sale on 1 April depends on agreements between Dyno Nobel, Mayfair, the Queensland government, and the Australian Competition and Consumer Commission, Dyno Nobel said. Dyno Nobel will close Phosphate Hill by 30 September 2026 if the sale is unsuccessful, the company said.
The agreement includes around A$80mn of inventory from Phosphate Hill. Dyno Nobel will provide A$125.9mn to support the future rehabilitation and remediation of the facility.
The sale also ensures employment for current employees, allowing the facility to continue to provide a domestic fertilizer supply, Dyno Nobel said.
Extended closures of the Mount Isa railway and disruptions to metallurgical gas supply to the Mount Isa plant affected Phosphate Hill's operations over July 2025-February 2026.
The facility depends on sulphuric acid supply from Glencore's Mount Isa copper smelter and refinery.
Phosphate Hill generated A$233.2mn of earnings ending before interest and taxes in the October 2024-September 2025 financial year, the company said on in November 2025. It has generated A$33mn in its October 2025-September 2026 financial year to date, it said.
Glencore received a A$600mn aid package from the Australian government to support the Mount Isa copper smelter and Townsville refinery, allowing the company to continue operations and invest in upgrades, Glencore said in October 2025.
Glencore and Phosphate Hill operations are interlinked, Australia's minister for industry Tim Ayres said in an interview on 18 February. They are interoperable, and it is very important that Phosphate Hill's owners operate in the regional interest and invest in the site, Ayres added.
Mayfair did not respond to comment by time of publishing.

