ore-leaching tank - pad construction
- overhead caving
- overhead conveyer
- overhead line
- overhead loader
- overhead mining
- overhead stoping
- overhead storage water tank
- overhead tippler
- overhead wire
- overhead wire locomotive
- overite
- overlain
- overland conveyor
- overlap
- overlap fault
- overlap fold
- overlap of beds
- overlap of oceans
- overlap section
- overlapped structure
- overlapping
- overlapping anomalies
- overlapping fissures
- overlapping lenses
- overlay
- overlie
- overload
- overload capacity
- overloaded river
- overlooked sand
- overlying bed
- overlying confining beds
- overlying cover
- overlying deposit
- overlying formation
- overlying layer
- overlying measures
- overlying reflector
- overlying refractor
- overlying rock