KIEV. Jan 24 - Poltavsky GOK, Ukraine's biggest iron ore pellet producer, could increase its prices 10%-30% in the coming months, an owner of the company said.

"We think prices will go up 10%-30%," Konstantin Zhevago, a major PGOK shareholder, told an investment forum in Kiev, adding that the new prices would not be higher than Brazilian producers are charging or Japanese consumers are willing to pay.