The mother of an Australian man killed in the Pike River mine disaster in New Zealand says she's heartbroken but will accept a decision never to re-enter the underground site.

Joanne Ufer’s 25-year-old son Joshua died in the tragedy that left 29 workers entombed after a methane-fuelled explosion four years ago. Mine owners Solid Energy announced on Thursday that despite its best efforts, it hadn’t been able to come up with a plan that would keep those involved in the…