ExecuteReader 要求已打开且可用的 Connection。连接的当前状态为正在连接。 Typical Iron Ore Mines Layout

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Typical Iron Ore Mines Layout

specifically assigned Before mining begins a mining plan and a mine closure and reclamation plan must be prepared and approved These plans should be updated regularly as mining progresses Base Metal and Iron Ore Mining Pollution Prevention and Abatement Handbook WORLD BANK GROUP Effective July 1998

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