Open-cast mine
As opposed to underground mines, in open-pit mines the layers covering coal are removed, so the coal can be extracted on the surface.
Lớp 5 – 12
Từ khoá
mozaLink
/Weblink
As opposed to underground mines, in open-pit mines the layers covering coal are removed, so the coal can be extracted on the surface.
Lớp 5 – 12
Từ khoá
mozaLink
/Weblink