The families of the 29 men killed in the Pike River mining tragedy want the three parties charged in connection with the disaster to be named.
The Labour Department laid 25 charges under Health and Safety Act in the Greymouth District Court on Thursday. The names of those charged are suppressed.
Carol Rose, a spokesperson for the families of the dead, says they would like the names and types of charges released within a week as it is difficult to know what to think of them without that information.
Grey District Mayor Tony Kokshoorn, is calling on those charged to come forward as speculation over their identity is rife in the town.
He says the suppression is unfair to innocent parties who are being implicated and the identities will eventually emerge anyway.
The Labour Department says it is taking urgent steps to ensure the names can be published when possible.
The Engineering, Printing & Manufacturing Union says it's worried charges against individuals involved in disaster will impede the Royal Commission inquiry.
Assistant national secretary Ged O'Connell says the charges may complicate the inquiry.