Nissan and Huntsmen are among the firms on their way into Lynemouth to try create job opportunities for laid-off Alcan workers.
The companies are gathering to hold an internal jobs fair at the smelter.
Rio Tinto confirmed it is closing the smelter and would make more than 500 people redundant.
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The four people who were all related were killed on the A64 near Malton as they returned from a wedding in Leeds.
GMB's Ben Shephard is cycling, running and swimming from Whitehaven to Tynemouth to raise money for the Children's Heart Unit Fund (CHUF).
Grandfather Stewart Anderson, 54, died after an incident at Durham's Loveshack nightclub in Durham City