In Japan in 1910, the Mitsui Mining and Smelting Company began discharging cadmium into the Jinzugawa river, as a byproduct of mining operations.
Di Jepang pada tahun 1910, Mitsui Mining and Smelting Company mulai membuang kadmium ke sungai Jinzugawa, sebagai produk sampingan dari operasi penambangan.