Attempts have been made to replace the 400 jobs lost at the plant in 2009 A leisure resort could come to the Anglesey Aluminium site near Holyhead creating up to 600 jobs.
Anglesey Aluminium said they intended to work with a company called Land & Lakes, Anglesey Council and the Welsh Government to develop the plan on part of the site.
The company said the aim was to ensure “long term benefits” and increase “sustainable facilities”.
Part of the site had been for sale with offers invited in the region of £10m.
The company has previously said the re-melting plant on the land at Penrhos, Holyhead, will remain open and still be run by Anglesey Aluminium Metals Ltd (AAM).
There are also plans by Anglesey Aluminium Metal Renewables Limited (AAMR) for a proposed renewable energy plant on another section of the site.
Rio Tinto Group and Kaiser Aluminium closed the smelting part of the works in 2009 with the loss of 400 jobs after a discount energy deal failed.
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