"If Jacob Zuma doesn't want to come here, how does he expect to gain our votes?" one man shouted at the Cabinet ministers.
"Don't you know if the miners here don't vote for you, the ANC is going down?" another piped up, referring to the ruling African National Congress party.
Defense Minister Nosiviwe Noluthando Mapisa-Nqakula responded with the first official apology for the police killings.
"As a representative of the government, I apologize," the minister said. "I am begging, I beg and I apologize, may you find forgiveness in your hearts."
South Africa is the world's leading producer of platinum and ferrochrome, the fourth-largest producer of iron ore and is among the top 10 gold producers in the world.