青云翻译

According to incomplete statistics, the average tons of coal surface mining subsidence 0. 2 km2, for every million tons of coal mined land to dig a loss of about 0. 1 km2, the normal production of open-pit mining tons of coal per average pressure accounted Dump 0 . 16 km2 of land.

Incomplete statistics show that for every million tons of coal mining surface subsidence 0. 2 km2, dug every million tons of coal mining loss of about 0. 1 km2, normal production every million tons of coal in open-pit mine dump on average accounted for 0. 16 km2 of land.

According to incomplete statistics, equally every time mines ten thousand ton coal surfaces to cave in 0. 2 km2, mines ten thousand tons coals to have every time to dig damages the land approximately 0. 1 km2, when strip mine regular production every time picks ten thousand ton coal row of depot ave

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Incomplete statistics show that for every million tons of coal mining surface subsidence 0. 2 km2, dug every million tons of coal mining loss of about 0. 1 km2, normal production every million tons of coal in open-pit mine dump on average accounted for 0. 16 km2 of land.