I believe the term shown in the question is mispelt. It would seem to be asking "what is a colliery hewer?". A colliery hewer is a person, invariably male owing to the nature of the work, employed below ground in a coal mine to cut and load coal. In former times, the hewer would use a pick and shovel for these tasks, loading the coal into wheeled containers on rails, but in more recent times the actual cutting is carried out by blasting with explosives and coal-cutting machines of various kinds, with the coal being transported away by conveyor belt. It was, and is, an extremely hazardous and exhausting occupation.
Seafield Colliery was created in 1960.
Kilnhurst Colliery ended in 1989.
Kellingley Colliery was created in 1965.
Steetley Colliery ended in 1983.
Kingsbury Colliery ended in 1968.
Kingsbury Colliery was created in 1897.
Sutton Colliery ended in 1989.
Benxihu Colliery happened in 1942.
Hamstead Colliery was created in 1876.
Silverwood Colliery ended in 1992.
Shireoaks Colliery ended in 1991.
Markham Main Colliery was created in 1916.