Opposition MPs accuse Prime Minister John Key of breaking promises to the families of the 29 men killed in the Pike River coal mine.
Labour and the Greens ask if Solid Energy, now tasked with mine development, will recover the miners' bodies when the state-owned company is partially privatised.
Energy Minister Phil Heatley says Solid Energy and the government have an agreement about body recovery to formalise the Government's expectations.
Solid Energy, which has finalised the purchase of the mine where 29 men died after the blast on November 19, 2010, will take all reasonable steps to recover the bodies from the mine as long as it's "safe, technically feasible and financially credible".
Labour MP Damien O'Connor says the families have been told they may have to wait eight years to recover the bodies of their loved ones.
"John Key was one of the first to step in and offer comfort to the miners' families. He has now shifted all the responsibility to a company that he intends to sell off," Mr O'Connor said.
The families had every right to accuse Mr Key and the government of having broken a promise.
Greens MP Kevin Hague says a privatised Solid Energy may be less likely to focus on body recovery.
Solid Energy chief executive Don Elder says West Coast geology and mining conditions are among the hardest in the world and are unforgiving in every way.
The mine is on Department of Conservation administered land.
NZN