prel - psep
- preliminary
- preliminary assay
- preliminary assembly
- preliminary breaker
- preliminary concentrate
- preliminary crushing
- preliminary developing
- preliminary drilling
- preliminary drying
- preliminary engineering inspection
- preliminary exploration
- preliminary grinding
- preliminary infusion
- preliminary investigation
- preliminary methane drainage
- preliminary oxidation
- preliminary robbing
- preliminary shaft
- preliminary sinking
- preliminary support
- preliminary survey
- preliminary work
- preliminator
- premafrost
- premature caving
- premature explosion
- premature failure
- premature sharpening
- premature shot
- premelt crystallization
- premine bolter
- premix
- premixed concrete
- premixing
- premoulded
- preore
- prepacked cement grout capsule
- preparation
- preparation equipment
- preparation loss
