richterite - room blower
- ripping face
- ripping head
- ripping lip
- ripping machine
- ripping web
- ripple
- ripple crest
- ripple index
- ripple mark
- ripple marks
- rippled
- riprap
- rips
- rise
- rise another 2.8% to
- rise entry
- rise heading
- rise level
- rise of piesometric surface
- rise of seam
- rise of water table
- rise working
- rise workings
- riser
- riser head
- riser shaft
- rising
- rising and falling motion
- rising blasthole
- rising formation waters expelled from compacted mudstones
- rising main
- rising mine
- rising of sea level
- rising sill type gate
- rising thermal
- risorite
- Riss
- Riss-Wurm
- Rissian
- Rissian stage