Police would have a strong legal foundation to lay charges against Pike River mine executives if New Zealand had a corporate manslaughter law, Labour's MP Andrew Little says.

The families of the victims were told on Wednesday there wasn't enough evidence to link individuals to specific events leading to the 2010 explosion in the West Coast coal mine that killed 29 men, including two from Queensland.

Police said manslaughter charges had to be ruled out.

Mr Little, Labour's justice spokesman and the author of a member's bill which would put corporate manslaughter on the statute book, says that under his proposed legislation police wouldn't have to tie the cause of the deaths to the specific actions of individuals.

"They could look at aggregate failures by a number of people to make a charge stick," he said on Thursday.

"The charge of corporate manslaughter focuses on a high level of negligence at the board and senior management level and means failures in corporate culture can be called to account."

Mr Little's bill is in the ballot and has to be drawn before it goes onto parliament's agenda.

The families of the victims were disappointed when police told them no criminal charges would be laid, and are considering civil action.