(19)

(11)

EP 2 678 529 A1

(12)

(43) Date of publication: 01.01.2014 Bulletin 2014/01 (21) Application number: 12749310.4 (22) Date of filing: 10.02.2012

(51) International Patent Classification (IPC):  E21F 11/00(2006.01) E21D 1/00(2006.01) (86) International application number: PCT/SE2012/050136 (87) International publication number: WO 2012/115569 (30.08.2012 Gazette 2012/35)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 24.02.2011 SE 1151286 (71) Applicant: BERGTEAMET AB 936 32 Boliden (SE)	(72) Inventors: BERGKVIST, Magnus S-936 32 Boliden (SE) STENBERG, Jonas S-931 96 Skellefteå (SE) WALLIN, Gunnar S-553 13 Jönköping (SE) (74) Representative: Norman, Pia Christiane  Zacco Sweden AB P.O. Box 5581 114 85 Stockholm 114 85 Stockholm (SE)