The company said late in June that 19 workers at the mine tested positive during routine testing, after which the mine's operations were suspended and 298 workers on the site underwent further testing.
"A total of 82 workers have tested positive for COVID-19 using polymerase chain reaction (PCR) tests", the company said in a statement on Friday.
It added that while three workers are presently displaying mild symptoms, all other workers are currently asymptomatic.
"Workers who have tested positive will remain in safe quarantine for up to two weeks", the company said.
"If symptoms develop, the affected workers will be transported to medical facilities for treatment."