Korea Zinc, world's lead producer of refined zinc, agreed to buy a 13.46% stake at Canadian junior miner Woulfe Mining for US$ 9.8 million, taking advantage of rising demand for the metal. Woulfe also produces industrial metals such as tungsten and molybdenum, and precious metals such as gold and silver. Korea Zinc also bought from Woulfe controlling stakes at the latter's projects in Korea, by paying a further US$ 29.4 million to the former.