abandoned workings
... 沸腾法：boiling method 废巷道：abandoned workings 废石装载机：dirt loader ...
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修复利用废弃巷道和采空区，储存矿山自身产生的废渣和工业废渣，缓解废石场与耕地争地的矛盾。
Also abandoned shaft and mined-out area repaired can be used for depositing waste slag from mine itself and other industrial waste to mitigate a contradiction between waste site and cultivation land.
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