The committee concluded 'as for the copper which damages crops, there are the residues flowed before the preventive construction, however in the current operation, the flowing poison is a little, so the government exonerates Furukawa Mining from blame' (Masaomi YUI "Tanaka Shozo"), and in fact, in October of 1903, 'the damaged area had a good crop of rice' and Shozo TANAKA also gave lectures at many places setting the title of the lecture as 'the real circumstances of the rich harvest in the damaged area' ("the complete works of Shozo TANAKA" page 477 of the "supplementary volume").
同調査会の結論は「作物に被害を与える銅分は、予防工事前の残留分で現業によるものは少ないとして古河鉱業の責任を解除した」（由井正臣『田中正造』）ものだったが、実際、1903年10月には「被害地の稲は豊作」になり、田中正造も「被害地豊作の実況」と題する演説をして歩いた（『田中正造全集・別巻』477頁）。