Joy miner

Joy miner

[′jȯi ′mīn·ər]
(mining engineering)
A continuous miner weighing about 15 tons (13,600 kilograms) and made up of a turntable, a ripper bar, and a discharge boom conveyor; used mainly in coal headings and in extraction of coal pillars.
References in periodicals archive ?
Two are mounted on each Joy miner, the first pair were installed in 1984, the second at the end of 1988 and the third at the end of 1989.
Massey Coal mining subsidiaries only use Joy miners and these account for a large portion of the company's total annual output of around 31 Mt.