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Production stopped "after a period of pot instability" during ramp-up of the potline, it said.

A potline is a series of containers used to reduce, or smelt, aluminum.

Alcoa said it expects to bring the potline back into service between the first and second quarter of next year.

But Lane said that in the grand scheme of things, the idled potline is a relatively minor issue.

Alcoa said it is temporarily stopping production at smelters in Brazil that have annual capacity of about 124,000 tonnes, and will permanently close a 40,000 tonne potline at its Massena East plant.