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- Obsidian
- a natural volcanic glass produced by rapid cooling of silica-rich lava
- Oil shale
- deposits of organic compounds that are precursors to petroleum; usually as shale of freshwater lake origin
- Orebody
- naturally occurring mineral region containing a valuable substance (such as gold, uranium); suitable for mining and processing to produce a desirable commodity at a profit
- Overburden
- material (such as rock or soil) which covers an orebody
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