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Subsidiaries of TBP currently have a combined capacity of 305,000 tonnes per year ferronickel smelters and plan to add 12 more production lines.

The victims were operating two dump trucks Thursday in the disposal area when they were engulfed by a wall of black sludge-like material, a type of soft gravel that is removed in ferronickel burning, said Dedy Kurniawan, a spokesperson for PT Indonesia Morowali Industrial Park, known as PT IMIP.

However, most nickel investment so far have gone to production of crude metal such as nickel pig iron and ferronickel.

Indonesia, one of China's biggest trading partners, is an important source of ferronickel, coal, copper and natural gas for the world's second-largest economy.

It turns ore into ferronickel.