Coalminers

3 clues
Underground employees
Diggers for anthracite
They get their picks in dark matter
Similar answers:
Abstainers
Airliners
Aliners
Attainers
Bagsonairliners
Barbarianentertainers
Baseliners
Berliners
Bluemoonshiners
Brainers
Carabiners
Chileanminers
Coalmen
Coalmien
Coalmine
Coalminer
Coalminers
Coalminersson
Coalmines
Coalmining