The companies, which caused methylmercury pollution, were Chisso Corp.
(Kumamoto and Kagoshima) and Showa Denko Co., Ltd. (Niigata). Chemical
Particularly, Chisso developed a lot of original techniques and renewed
facilities to extend their production capacity. Minamata City also developed
with Chisso and highly relied on tax revenue (more than half revenue) from
the company. Hence, Chisso heavily influenced not only economy but also
administration in Minamata city.
Chisso grew up larger and larger owing to advantage of supply of labors,
water, electricity, materials and dump. But they less concerned about labors