Large mining depth single seam non-full mining, surface structure has only minor extent of damage.

大采深单一煤层的非充分采动，地面建筑物受损程度很小。

youdao

The deposit is of large scale of mineralization, but the reserves of gold are small and so is the depth of mining.

该矿床矿化规模巨大，但已发现的金矿储量不大，矿体开采深度也较小。

youdao