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| Ultimate analysis |
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Determination, by chemical means, of the elements and compounds in coal.
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| Ultra basic |
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Igneous rocks containing less than 35% silica.
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| Umpire sample (assay) |
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An assay made by a third party to provide a basis for settling disputes between buyers and sellers of ore.
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| Uninterruptible power supply (UPS) |
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Provides conditioned power and battery backup for computers in the case of a power failure or brownout.
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| Unload |
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To release flow (usually directly to the reservoir), to prevent pressure being imposed on the system or portion of the system.
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| Unloading valve |
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A valve which by-passes flow to tank when a set pressure is maintained on its pilot port.
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| Uraninite |
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A uranium mineral with a high uranium oxide content.
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| Uranium |
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A radioactive, silvery-white, metallic element.
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