run of mine coal

例句：

1. 1.The company's run of mine coalis expected to last for another 20 years.
   该公司的煤矿预计还能开采20年。
2. 2. The miners are runninga tight ship, ensuring the safety oftheir workers and the mine.
   矿工们正在严格管理，确保工人和矿井的安全。
3. 3.The mine has been in operation for over50 years, producing a significantamount of coal.
   这个矿已经运营了50多年，生产了大量的煤炭。