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The projects in the Boodarie and Ashburton North Strategic Industrial Areas (SIA) are valued at A$70 billion, according to the government.
The Boodarie SIA is about 4km west of South Hedland and 12km south of Port Hedland.
The companies allocated land in the SIA are POSCO, Fortescue Metals Group, Alinta Energy, Tees Valley Lithium and BP.
The projects will produce green iron ore, ammonia, hydrogen, and lithium sulphate monohydrate.
The Ashburton North SIA land allocations, 12km south of Onslow, focus on production of ammonia and methanol.
The proponents are FMG subsidiary Fortescue Future Industries and Western Gas Corporation subsidiary Equus Energy.
"The approval of land allocations for the Boodarie and Ashburton North SIAs will help transform these sites into globally competitive, multi-product industrial precincts," WA state development, jobs and trade minister Roger Cook said.
"The projects across the two SIAs will deliver a range of projects including ammonia, green iron ore, and hydrogen.
"From job creation to growing the local advanced manufacturing industry and servicing international markets, we will see the economic benefits of these land allocations and these projects flow through the WA economy over time."
