The ore wastes of the site poured into Watarase-gawa River, and through the river poured into the fields of Morita Village, Yamada County, Gunma Prefecture (present Morita in Ota City) which was drawing water for fields directly from Watarase-gawa River.
崩れた鉱石くずが渡良瀬川を流れ、渡良瀬川から直接農業用水を取水していた群馬県山田郡毛里田村（現在の太田市毛里田）の田畑に流れ込んだ。