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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There are 66 candidates standing in the Tyne and Wear area in the General Election on June 8
Richard Vincent, 32, of Southmead Avenue in Blakelaw, was last seen in Newcastle city centre near to Spital Tounges.
There are 32 candidates standing in the Tees Valley area for the 2017 General Election