Johannesburg - About 150 000 coal workers, employed at 20 companies across South Africa, are expected to down tools at 18:00 on Sunday, the National Union of Mineworkers (NUM) said.
"The workers...are members of NUM and Solidarity," spokesperson Lesiba Seshoka said on Sunday.
Solidarity spokesperson Dirk Hermann was not immediately available for comment.
Chamber of Mines spokesperson Frans Barker said it had received a notice of intention to strike from the unions two days ago.
Negotiations deadlocked last week when both unions rejected the chamber's wage increase offer.
The chamber - negotiating for companies including Anglo Thermal Coal SA, Delmas Coal, Exxaro, Kangra Coal, Optimum Coal and Xstrata Coal - offered a revised 8.5% wage increase for entry-level employees and seven percent for other employees.
This offer was in conjunction with allowances for living out, medical incapacity and medical aid contributions.
NUM was demanding 14%, and Solidarity 12%.
"The workers...are members of NUM and Solidarity," spokesperson Lesiba Seshoka said on Sunday.
Solidarity spokesperson Dirk Hermann was not immediately available for comment.
Chamber of Mines spokesperson Frans Barker said it had received a notice of intention to strike from the unions two days ago.
Negotiations deadlocked last week when both unions rejected the chamber's wage increase offer.
The chamber - negotiating for companies including Anglo Thermal Coal SA, Delmas Coal, Exxaro, Kangra Coal, Optimum Coal and Xstrata Coal - offered a revised 8.5% wage increase for entry-level employees and seven percent for other employees.
This offer was in conjunction with allowances for living out, medical incapacity and medical aid contributions.
NUM was demanding 14%, and Solidarity 12%.