Electrical grounding - To connect with the ground to make the earth part of the circuit.
Entry - An underground horizontal or near-horizontal passage used for haulage, ventilation, or as a mainway; a coal heading; a working place where the coal is extracted from the seam in the initial mining; same as "gate" and "roadway," both British terms.
Evaluation - The work involved in gaining a knowledge of the size, shape, position and value of coal.
Exploration - The search for mineral deposits and the work done to prove or establish the extent of a mineral deposit. Alt: Prospecting and subsequent evaluation.
Explosive - Any rapidly combustive or expanding substance. The energy released during this
rapid combustion or expansion can be used to break rock.
Extraction - The process of mining and removal of cal or ore from a mine.
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