room conveyer - sand-clay matrix
- roselite
- rosenbuschite
- rosette structure
- rosickyite
- rosieresite
- rosin
- rosin jack
- rosolite
- ross
- rossite
- rosslerite
- rostellum
- rosthornite
- rostral
- rostrum
- rot damp
- rotaliform
- rotaliid
- rotary
- rotary airblast drilling
- rotary airblast hole (RAB hole)
- rotary bit
- rotary cardump
- rotary core bit
- rotary crusher
- rotary deflection
- rotary docking table
- rotary drier
- rotary drill
- rotary drilling
- rotary drilling machine
- rotary dump
- rotary dumper
- rotary elevator
- rotary fault
- rotary head
- rotary swivel
- rotary system
- rotary system of drilling
- rotary table press