In 2006, there was a round table process that resulted in a multipartite agreement to have a tougher regime for Canadian companies that involved a kind of ombudsman with investigative power. That was originally agreed to by the mining industry. Having not been involved in any of that, what I understand from reading is that some players in the industry decided they no longer supported that arrangement, and the Harper government decided to go for a lighter version that was based around promoting CSR standards but without any disciplinary mechanism.
On September 28th, 2017. See this statement in context.