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Mining
Glossary
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Lamp-House - A room or building
at the surface of a mine, provided for charging, servicing, and
issuing all cap, hand, and flame safety lamps held at the mine.
Layout - The design or pattern of the main roadway
and workings.
Leaching - Extracting a soluble metallic compound
from an ore by dissolving it in a solvent, such as water, sulfuric
acid, etc. and then recovering the metal by precipitation.
Lignite - A brownish-black coal in which the
alteration of vegetal material has proceeded further than in peat
but not so far as subbituminous coal.
Liquid Oxygen Explosive (LOX) - Sawdust or other
suitable material, formed into cartridges and dipped into liquid
oxygen before use in blasting.
Loader - A mechanical shovel or other machine
for loading coal, ore, mineral, or rock.
Loading Machine - A machine for loading materials
such as coal, ore, or rock into cars or other means of conveyance
for transportation to the surface of the mine.
Loading Ramp - A surface structure, often incorporating
storage bins, used for gravity loading bulk material into transport
vehicles.
Locomotive - An electric engine, either operating
from current supplied from trolley and track or from storage batteries
carried on the locomotive.
Longwall - The coal seam is removed in one operation
by means of a long working face or wall, thus the name. The workings
advance (or retreat) in a continuous line which may be several
hundreds of yards in length. The space from which the coal has
been removed (the gob, goaf, or waste) is either allowed to collapse
(caving) or is completely or partially filled or stowed with stone
and debris. The stowing material is obtained from any dirt in
the seam and from the ripping operations on the roadways to gain
height. Stowing material is sometimes brought down from the surface
and packed by hand or by mechanical means.
Low Coal - Coal occurring in a thin seam or
bed.
Lump Coal - Bituminous coal in the large lumps
remaining after a single screening that is often designated by
the size of the mesh over which it passes and by which the minimum
size lump is determined. Also, the largest marketable size.
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