Mining Expansion Shells

Slot  and  wedge  anchors  were  one  of  the  first  types  of  anchors  to  be  developed.  They  were  found  to  be
acceptable  in  very  hard  rock  where  they  were  being  used  during  1950s  in  the  Snowy  Mountains  Scheme  in
Australia. The Kiruna bolt is stil
l being used, mainly in the mines in the north region of Sweden
The Kiruna bolt is designed to be inserted in a borehole that has been pre-Filled with cement grout with the
Objective of being a “one -Pass" system with the slot and wedge anchor providing im
Mediate reinforcement
Action prior to curing of the cement grout. An attempt was made in the 1990s to introduce these bolts or an
Alternative slot and wedge bolt in an Australian mine.