Pike mine: South Australia shares NZ's pain - Rann

South Australians share the grief of everyone associated with the New Zealand mining disaster, Premier Mike Rann has told state parliament.

All 29 miners, including Australians William Joynson and Josh Ufer, who were trapped in the Pike River Mine are now believed dead after a second blast on Wednesday.

"As the family, friends and colleagues of the missing men gathered at the mine site earlier this week, we shared their hope and unwavering belief that fate would deliver their loved ones safe from harm, as it did in Chile," the premier said.

"Now, we share their grief and send them our thoughts and prayers, as they come to terms with this heart-rending outcome."

Mr Rann said he had no doubt that the neighbourhoods and communities of the Greymouth region would band together to provide support, understanding and hope in the days, weeks and months ahead.

"As they do so, they can be assured that the hearts and best wishes of South Australians are with them," he said.

As a mark of respect to the miners, flags on government buildings in South Australia were flown at half-mast on Thursday.

- AAP