ore-leaching tank - pad construction
- organolite
- organometallic
- organosedimentary
- organotrophic
- organpipe coral
- oribatids
- orido
- orient
- oriental
- oriental alabaster
- oriental amethyst
- oriental cat's eye
- oriental emerald
- oriental ruby
- oriental salmons
- oriental topaz
- orientate
- orientate the mineral
- orientation
- orientation of grain
- orientation of striae
- orientation-selective transformation
- oriented needles
- oriented specimen
- orientite
- orifice
- orifice 1. пал. апертура, отверстие, устье 2. выход; устье
- orifice board
- orifice meter
- orifice of ejection
- orifice of injection
- orifice of spring
- origin
- origin time
- original
- original blasting
- original dip
- original gas in-place
- original growth position
- original in-Place reserves