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Oblique fault

A fault that strikes oblique to, as opposed to parallel or perpendicular to, the dominant structure

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Overturned

Where older rock beds have been moved over younger rock beds

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Orogeny

The period of geological time where the Earth’s crust folded sufficiently to create mountains

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Orogen

A continuous structure of rock having similar metamorphosis or deformation

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Ore pass

A vertical or sloping passage or chute used to convey ore to a connecting level or passage

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Orebody

A defined mass of materials evaluated to contain a known percentage of target minerals

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Ore

Rocks outlined or extracted for the purpose of extracting target minerals