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Shania Twain's estranged husband is set to spend millions on more prime South Island high country land.

Twain and music producer Mutt Lange paid $21.4 million for Motatapu and Mt Soho Stations near Wanaka seven years ago. Their marriage collapsed in 2008 after 14 years.

Now Lange is eyeing up the adjacent 22,395ha Coronet Peak Station, which has a capital value of $5.2 million. Russell Hamilton, who supervises Lange's existing 33,000ha property portfolio, said Lange's company Soho Properties had applied to the Overseas Investment Office to buy more land.