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1. is the environment needed for coal to be formed anaerobic or aerobic
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2. what is the name of the collapsed coal in longwall mining?
3. what supports the roof of a working face
- iron hoops
- hydraulic jacks
- titanium hoops
- steel hoops
4. which of these processes are first in extracting coal from an opencast mine
- overlying soil is extracted and placed onto a separate pile
- overlying rock (overburden) is extracted and placed into a dump
- two access tunnels are drilled into the area of extraction
5. which of these is an advantage for opencast mining?
- does not create an eyesore for the environment?
- is flexible and can mine around the problems
- can mine under the sea
- can reach very deep coal seams
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