Johannesburg - The Association of Mining and Construction Union (Amcu) wants the report by the Marikana commission of inquiry reviewed.
"In our view Judge [Ian] Farlam's report was a disgrace - it was a bloodwash," Amcu president, Joseph Mathunjwa, told reporters in Johannesburg.
"The mineworkers that fought a heroic struggle were the ones blamed for causing the massacre."
He said the union was taking legal advice on having the commission's outcomes reviewed and if necessary, would support an independent inquiry into the massacre that saw police kill 34 miners.
Mathunjwa said the Farlam Commission of Inquiry into the shooting had robbed mineworkers of justice.
"As Amcu we believe that the Lonmin massacre, which is known as the Marikana massacre signalled the end of the dream of a new South Africa, of the rainbow nation of the negotiated settlement."
On Sunday, the third Marikana commemoration will be held at the koppie starting at 09:00. Legal representative for the injured and arrested mineworkers, Dali Mpofu, said the commemoration was an open to anyone who wanted to attend.
The struggle for truth
Mathunjwa said Amcu was also undertaking a major fundraising campaign to build houses for the widows of the mineworkers killed.
The union will be going on international speaking tours to share the "suffering we have had to endure".
The families of the dead mineworkers are suing the minister of police for the loss of their breadwinners.
"The struggle for the truth will be a long one but we are standing with our members, the widows and the other family members, for as long as it takes," said Mathunjwa.
"This search for justice begins with the Amcu supported civil claims against the minister of police lodged by the widows and families of those killed and maimed."
Thirty-seven claims have been lodged against Police Minister Nathi Nhleko.
More claims against the state were expected to be lodged this week.
Amcu was demanding that government not contest these claims, but rather provide compensation to the Marikana victims' families.
By Genevieve Quintal for news24