coal

control

controller

coworkers

dump

earth

energy

engineer

engineering

equipment

excavation

exploitation

export

fossil

fuel

geology

group

hard

hat

helmet

huge

industrial

industry

job

large

laughing

lignite

machine

man

material

metal

mine

miner

mineral

opencast

ore

people

pit

plant

power

production

quarry

quarrying

raw

rock

safety

science

team

teamwork

vehicle

walking

workbusiness

worker

working