• Shares of Macmahon Holdings rise as much as 5% to A$1.050, posting their biggest intraday percentage gain since September 24

• Mining services provider's unit Macmahon Underground secures two-year contract extension from Vault Minerals at Daisy Milano gold mine in Western Australia

• Says extension is expected to generate about A$98 million ($68.13 million) in revenue, extends contract to October 2028

• Says FY27 guidance and capital expenditure budget remain unchanged

• Stock up 57.1% this year, as of last close

($1 = 1.4384 Australian dollars)

(Reporting by Roshan Thomas in Bengaluru)