Australian iron ore miner Fortescue Metals Group is working closely with the Department of Health to assist with contact tracing after a contractor, who had worked at its Cloudbreak mine in Western Australia from July 20-27, returned a "weak positive" test result.
CEO Elizabeth Gaines told reporters on the sidelines of the 30th annual Diggers & Dealers mining forum in Kalgoorlie the company had protocols in place and the ability to isolate close contacts on site if needed.
Among commodities, the gold price remains around US$1,810 an ounce.
Base metals were mainly lower, with copper down about 0.8% on the London Metal Exchange.
In London, Fresnillo lost 3.2% while Anglo American was up 1.5%.
In Australia, Fortescue was down 0.4% in morning trade and BHP was off 0.9%.