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| Open center circuit |
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One in which pump delivery flows freely through the system and back to the reservoir in neutral.
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| Open center valve |
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One in which all ports are interconnected and open to each other in the center or neutral position.
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| Open pit |
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A surface mine, open to daylight. Also referred to as open-cut or open-cast mine.
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| Ore |
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A mixture of ore minerals and gangue from which at least one of the metals can be extracted at a profit.
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| Ore dressing |
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Removal of waste and the preparation/concentration of ore.
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| Ore grade |
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Amount of minerals contained in an ore. Expressed as a percentage or grams per tonne.
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| Orebody |
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A natural concentration of valuable material that can be extracted and sold at a profit.
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| Oreshoot |
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The portion, or length, of the vein, or other ore structure, that carries sufficient valuable mineral to be extracted profitably.
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| Orifice |
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A restriction, the length of which is small in respect to its cross-sectional dimensions.
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| Overburden |
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Waste rock or cover above an orebody.
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| Oxidation |
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Chemical reaction caused by exposure to oxygen that results in a change in the chemical composition of a mineral.
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