Family members of the Lily Mine workers trapped underground for nearly two months are upset by the slowing pace of the rescue and recovery mission.
Trade union federation the Congress of South African Trade Unions (Cosatu) said last week it would ensure those responsible for the Lily Mine tragedy were held to account.
Cosatu also suggested mine management was withholding key information about the cause of the collapse.
Cosatu spokesperson Sizwe Pamla said: “An investigation must be carried out and those who were reckless and those who failed to adhere to health and safety standards should be held accountable.
“The fact that we’ve been barred twice makes us suspicious about what they don’t want us to find out,” Pamla said.
Phindile Nkambule, the sister of one of the victims, said: “At the moment I’ve run out of energy to say anything to anyone.
“We’ve been emotionally drained by the whole ordeal.”
It has been almost two months since a lamp-room container plunged into a giant hole caused by a rock fall at the mine near Barberton in Mpumalanga.
Solomon Nyarenda, Yvonne Mnisi and Pretty Nkambule, who were inside the lamp-room container at the time, have been trapped underground since then and efforts to rescue them have not succeeded.