(19)

(11)

EP 2 232 014 A1

(12)

(43) Date of publication: 29.09.2010 Bulletin 2010/39 (21) Application number: 08864186.5 (22) Date of filing: 15.12.2008

(51) International Patent Classification (IPC):  E21D 20/00(2006.01) E21D 21/00(2006.01) E21D 20/02(2006.01) (86) International application number: PCT/AU2008/001838 (87) International publication number: WO 2009/079684 (02.07.2009 Gazette 2009/27)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 21.12.2007 AU 2007907063 (71) Applicant: Alminco Pty Ltd Fairy Meadow, NSW 2519 (AU)	(72) Inventor: RICARDO, Di Pietro Tarrawanna, NSW 2518 (AU) (74) Representative: Pearson, James Ginn  Abel & Imray 20 Red Lion Street London WC1R 4PQ London WC1R 4PQ (GB)