"Specially trained mine rescue teams have been deployed underground," the company said.
The same mine was the site of a 2007 disaster in which nearly 3,000 miners were trapped after a pipe burst.
The office of President Jacob Zuma expressed shock at today’s events.
"The President wishes the miners and their families strength during this period," spokesman Mac Maharaj said in a statement. "He has also urged that everything possible should be done to ensure the safe rescue of the miners."
South Africa's gold mines are the deepest in the world and have been ranked as some of the most dangerous, particularly during apartheid. Officials said that the number of fatalities in 2014 was the recorded lowest in the industry's history with 84 deaths. Deaths in gold mines increased from 2013, however.
