The Hachinohe zinc smelter uses the Imperial Smelting Process (ISP) to make zinc. A process where the Imperial smelting Furnace (ISF) is the key unit operation simultaneously producing lead and zinc. Hachinohe is now the only ISP plant in Japan. The current capacity is 112kt/a slab zinc and there are currently no plans to expand this. Hachinohe is considered as one of if not the best example of ISP operation currently in operation.