** Shares of Perenti PRN.AX up 2.8% at A$0.925, set for
best day since Dec. 27, if gains hold
** Mining service co says its underground mining businesses
have been awarded contract extensions valued A$420 mln ($275.10
mln)
** Says extensions include a one-year A$180 mln contract at
AngloGold Ashanti's Obuasi underground gold mine in Ghana
** Stock down 13.5% this year, as of last close
($1 = 1.5267 Australian dollars)
(Reporting by Ayushman Ojha in Bengaluru)
((Ayushman.ojha@thomsonreuters.com;))