The investigative report looks at whether government officials should have warned local residents about the risk of a potential tailings pond breach in the province's Central Interior.
Last August, a wall of the Mount Polley tailings pond broke and spilled 10 billion litres of water and 4.5 million cubic metres of sand laden with toxic arsenic, nickel and lead into B.C. waterways.
Later that month, the province's privacy commissioner, Elizabeth Denham, announced she would investigate whether the province had information about the dangerous conditions at the mine but chose not to release it.
The investigation was triggered by a complaint filed by the executive director of the B.C. Freedom of Information and Privacy Association.
The release of today's report comes as the province contemplates the re-opening of the Mount Polley mine.
The Ministry of Energy and Mines says the facility could re-open for business later this month.