Smart tech is Kumba''s best hope of extending Sishen Iron Ore
May 22, 2018· KUMBA Iron Ore has a twopronged strategy to extend the current 13 years remaining for its Sishen mine in the Northern Cape: exploration and technology.. The downturn in iron ore prices after 2012 coincided with a period when Sishen faced a significant stepup in its stripping ratio as it had to reconfigure the pit.