Furukawa Mining paid 51 percents of the total cost of 4.34 billion yen of the land improvement project and the government and Gunma Prefecture paid the most of the rest (Kiryu City and Ota City also paid a fraction)
古河鉱業は土地改良事業費43億4000万円のうち51%を負担し、残りの大部分は国と群馬県が負担した（ごく一部を桐生市と太田市が負担）。