Reducing roof fall accidents on retreat mining sections: Developing and following a mining plan, and using equipment properly could reduce miner exposure to ground falls
págs. 26-31
Spiral concentrators recover fine coal: Compound spirals offer better performance in a more efficient configuration
págs. 32-34
págs. 36-38
pág. 39
© 2001-2024 Fundación Dialnet · Todos los derechos reservados