Search and rescue operations at the Lily gold mine near Barberton, Mpumalanga, remain suspended as geo-technicians are yet to conclude their safety assessment report.
Thursday marks 28 days since a container used as a lamp room collapsed into a mine shaft with three workers.
Pretty Nkambule, Yvonne Mnisi and Solomon Nyerenda are still trapped underground.
Mine spokesperson Coetzee Zietsman says the completion of drilling an 80 metre long escape route is a positive way forward.
However, Zietsman says rescue teams will only be sent underground once its deemed to be safe.
"We have a number of world renowned experts on the mine, to advise us and also to take some readings and to determine how safe it is to resume our operations. It's a very complex situation and we have to make sure that if we send rescue workers down into the mine that they will be safe. So, as soon as we have the report, then we will have a discussion with all the stakeholders."