Kenyan government nurses have gone on strike over delays in an agreement that will give them pay rises.
"We will continue to dialogue with them but we do not tolerate threats," Public Service and Labour Minister Prisca Mupfumira said.
The National Union of Mineworkers is opposed to the coal companies' intention to negotiate wages on an individual basis.
A decision has been taken "to support the candidacy of Cyril Ramaphosa for president".
Union members are concentrated in a handful of Amplats' operations including its Mogalakwena mine, the company's most profitable asset.