CEO Fabio Schvartsman said the company would only invest further in nickel if global prices for the metal rise from $13,000 per tonne currently to around $20,000 per tonne.
Researchers from Curtin University discovered reidite, one of the rarest minerals on Earth buried deep within an ancient meteorite crater in Western Australia.
Azerbaijan's leading gold mining firm said it produced 21,318 ounces of the metal in the last quarter, against 14,468 ounces in the same period of last year.