October 28, 2008 Cliffs Natural Resources has initiated production curtailments at two of its six North American Iron Ore mines. Cliffs indicated that the curtailments were necessary to bring production levels in line with demand. Cliffs will temporarily idle two small pellet furnaces at Northshore Mining and one small pellet furnace at United Taconite. Both locations are in Minnesota, USA. On a combined basis, the three furnaces have monthly pellet production capacity of approximately 300,000 tons.