old - outp
- old man
- old waste
- oligiste iron
- oligoclase
- olivine
- olivine rock
- on stream period
- one man drill
- one stage crushing
- one way traffic
- onsetter
- oolite
- ooze
- oozy
- opal
- open a mine
- open air plant
- open blasting
- open circuit
- open cog
- open cut drainage
- open cut method
- open cutting
- open ditch drainage
- open end method
- open height
- open hole
- open light mine
- open nog
- open pit bench
- open pit method
- open pit mine
- open stope method
- open stope mining
- open test pit
- open water drilling
- open work
- opencast
- opencast coal mining
- opencast explosive
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