Gupta's Liberty House and his father's related business, Simec, will pay around 330 million pounds to acquire the plant at Lochaber, in the western Scottish Highlands, and two hydro-electric plants that power it.
The group has committed to invest a further 120 million pounds, creating up to 600 jobs in coming years, Gupta said.
"Today is the start of an exciting new chapter in Scotland's manufacturing story and the Scottish government and its agencies will keep working with Sanjeev Gupta and the GFG Alliance to help them realise their enterprising vision for Lochaber," said Scotland's First Minister, Nicola Strugeon, during a site visit.
He said: "We hope this day will come to be recognised as the start of a bright new future for Highland industry. It puts Lochaber right at the heart of our vision for sustainable and integrated local production that can revitalise British manufacturing."
Today's announcement follows a deal unveiled last month involving Liberty House and Simec to take over the site formerly owned byRio Tintoin Scotland.
Gupta's plans include creating an aluminium wheel manufacturing facility with 300 jobs directly and another 300 in the supply chain.
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