Newcrest's gold production dropped to 614,715 ounces in the quarter ended in December, from 615,498 ounces in the three months immediately prior and 620,691 ounces a year ago.
Mines minister Mosebenzi Zwane noted that 19 of the 73 miners who died in South Africa last year lost their lives at operations run by those companies.
World's largest listed copper miner said Indonesian export ban will force it to slash spending and operate its giant Grasberg operations at 40% capacity.
