Mawethu stevens
Amcu threatens to halt SA's economy
Amcu wants its members from around the country to take part in a mass march to the Union Buildings.
Amcu says miners will regroup on Thursday for Mawethu Stevens' memorial service.
There are renewed fears of violence after Marikana miners downed tools and embarked on a wildcat strike.
NUM says Mathunjwa must follow up with police to ensure the allegations are investigated.
Mawethu Stevens had been threatened because miners in the area disagreed with Amcu.