Industry Glossary

Industry Glossary

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Term Definition
Lagging
Planks or small timbers placed between steel ribs along the roof of a stope or drift to prevent rocks from falling, rather than to support the main weight of the overlying rocks.
Lamp
The electric cap lamp worn for visibility. Also, the flame safety lamp used in coal mines to detect methane gas concentrations and oxygen deficiency.
Lamprophyre
An igneous rock, composed of dark minerals, that occurs in dykes; sometimes contains diamonds.
Laterite
A residual soil, ususally found in tropical countries, out of which the silica has been leached. May form orebodies of iron, nickel, bauxite and manganese.
Launder
A chute or trough for conveying pulp, water or powdered ore in a mill.
Lava
A general name for the molten rock ejected by volcanoes.
Layout
The design or pattern of the main roadways and workings. The proper layout of mine workings is the responsibility of the manager aided by the planning department.
Leachable
Extractable by chemical solvents.
Leaching
A chemical process for the extraction of valuable minerals from ore; also, a natural process by which ground waters dissolve minerals, thus leaving the rock with a smaller proportion of some of the minerals than it contained originally.
Lens
Generally used to describe a body of ore that is thick in the middle and tapers towards the ends.
Lenticular
A deposit having roughly the form of a double convex lens.
Level
The horizontal openings on a working horizon in a mine; it is customary to work mines from a shaft, establishing levels at regular intervals, generally about 50 metres or more apart.
Lift
The amount of coal obtained from a continuous miner in one mining cycle.
Lignite
A soft, low-rank, brownish-black coal.
Limestone
A bedded, sedimentary deposit consisting chiefly of calcium carbonate.
Limit order
An order made by a client to a broker to buy or sell shares at a specified price or better.
Limonite
A brown, hydrous iron oxide.
Line cutting
Straight clearings through the bush to permit sightings for geophysical and other surveys.
Liquefaction
The process of converting coal into a synthetic fuel, similar in nature to crude oil and/or refined products, such as gasoline.
Lithology
The character of a rock described in terms of its structure, color, mineral composition, grain size, and arrangement of its component parts; all those visible features that in the aggregate impart individuality of the rock. Lithology is the basis of correlation in coal mines and commonly is reliable over a distance of a few miles.

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