Australia's Macmahon Holdings gains on securing $68 million gold mine contract extension
** Shares of Macmahon Holdings MAH.AX 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 VAU.AX 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)