A report into what led to multiple criminal charges being laid after the Pike River mine explosions will be made public.
The Royal Commission has denied a request that the Department of Labour's dossier, the result of a year-long investigation after the Pike River mine disaster, be divulged behind closed doors.
A series of explosions at the Pike River Coal mine on the West Coast killed 29 men in November last year.
The department laid 25 charges against Valley Longwall International Drilling company, Pike River Coal and its former chief executive Peter Whittall last month.
Mr Whittall's legal team argued the dossier should be heard secretly to ensure he got a fair trial later.
The dossier reportedly details why the company and Mr Whittall are being charged.
The Royal Commission had ruled that the report would be heard in public to ensure an open inquiry but would restrict the document's use on a case by case basis.
The Royal Commission said it was in the public interest to ensure an open inquiry.
