district air crossing - drill hole collar
- downcart side
- downcast
- downcast fault
- downcast shaft
- downcast side
- downcast ventilating shaft
- downcoast
- downcutting
- downdip
- downdip extent of mineralization
- downdip extent of the veins
- downdip ore continuity
- downdip shooting
- downdraft
- downfall
- downfaulted
- downfaulted block
- downfaulted trough
- downflow
- downfold
- downgoing
- downgoing data
- downgoing event
- downgoing ray
- downgoing signal
- downgoing wave
- downgoing wave energy
- downgoing wave field
- downgoing wave front
- downgoing wavefield
- downgoing wavefront
- downgrade
- downhill
- downhill creep
- downhole
- downhole analyzer
- downhole electrode configuration
- downhole geophysical survey
- downhole hardware
- downhole percussion source