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| Efficiency |
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The ratio of output to input. Volumetric efficiency of a pump is the actual output in gpm divided by the theoretical or design output. The overall efficiency of a hydraulic system is the output power divided by the input power. Efficiency is usually expressed as a percent.
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| Electro-hydraulic servo valve |
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A directional type valve which receives a variable or controlled electrical signal and which controls or meters hydraulic flow.
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| Electrolysis |
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Process where an electric current is passed through a solution containing dissolved metals, causing the metals to be deposited on to a cathode.
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| Electrostatic separator |
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Machine using static electrical charges to separate mineral concentrates.
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| Element |
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Substance composed of atoms that can't be broken down further by ordinary means.
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| EM survey |
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A geophysical method of surveying where the electromagnetic properties of rocks are measured.
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| Encoder |
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Device attached to a moving chain that produces an electrical signal each time the chain moves a fixed distance. The encoder is attached to the chain and used to track the movement of the pieces through a scanner.
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| Energy |
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The ability or capacity to do work. Measured in units of work.
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| Environment |
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The aggregate of physical, chemical and biological factors that act upon an organism or an ecological community and ultimately determine its form and survival.
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| Environmental study |
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Study done to determine how a proposed mining operation would impact the natural surrounding and wildlife.
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| Error (signal) |
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The signal which is the albraic summation of an input signal and a feedback signal.
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| Evaluation |
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The calculated cost of mine construction in comparison to the value of the deposit.
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| Evaporate |
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Changing water from a liquid to a vapor form.
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| Excess air |
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Refers to the quantity of air supplied that exceeds the minimum necessary to support the combustion chemistry.
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| Exploration |
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The search for new mineral/ore deposits. Includes prospecting, sampling, mapping, drilling, etc.
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| Explosive |
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Rapidly combustive or expanding substance whose energy released can be used to break rock.
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| Extraction |
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The mining and removal of ore from a mine.
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