Introducing
Your new presentation assistant.
Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.
Trending searches
-open space left behind from extraction
-country rock is sufficiently strong
-may required artificial support
-removing hazardous gas and dust
-manage underground temperatures
a vertical connection between levels, it is driven from a lower level to upper level
a tunnel driven downward from the surface and joining two different levels
3 types:
-Spiral ramps
-Switchback ramps
-Straight ramps
-horizontal openings
-Drifts are simply tunnels made in the rock, with a size and shape depending on their use.
Underground mining refers to various underground mining techniques used to excavate hard minerals, usually those containing metals.
-vertical opening
-provides access to an underground ore body
-excavated from the surface to the deepest mining horizon