... Head openings 封头开孔 mine openings 矿山巷道 driving openings 巷道掘进 ...
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After the inundation of shaft in Chengchao Iron Mine, large area collapse of development openings caused serious influence on production.
程潮铁矿淹井后采准井巷大面积坍塌，给生产造成严重影响。
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