Industry Glossary

Industry Glossary

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Term Definition
Igneous rocks composed mostly of dark, iron- and magnesium-rich minerals.
The molten material deep in the Earth from which rocks are formed.
Magmatic segregation
An ore-forming process whereby valuable minerals are concentrated by settling out of a cooling magma.
Magnetic gradient survey
A geophysical survey using a pair of magnetometers a fixed distance apart, to measure the difference in the magnetic field with height above the ground.
Magnetic separation
A process in which a magnetically susceptible mineral is separated from gangue minerals by applying a strong magnetic field; ores of iron are commonly treated in this way.
Magnetic survey
A geophysical survey that measures the intensity of the Earth's magnetic field.
Magnetic susceptibility
A measure of the degree to which a rock is attracted to a magnet.
Black, magnetic iron ore, an iron oxide.
An instrument used to measure the magnetic attraction of underlying rocks.
Main entry
A main haulage road. Where the coal has cleats, main entries are driven at right angles to the face cleats.
Main fan
A mechanical ventilator installed at the surface; operates by either exhausting or blowing to induce airflow through the mine roadways and workings.
Man trip
A carrier of mine personnel, by rail or rubber tire, to and from the work area.
A safety hole constructed in the side of a gangway, tunnel, or slope in which miner can be safe from passing locomotives and car. Also called a refuge hole.
An entry used exclusively for personnel to travel form the shaft bottom or drift mouth to the working section; it is always on the intake air side in gassy mines. Also, a small passage at one side or both sides of a breast, used as a traveling way for the miner, and sometimes, as an airway, or chute, or both.
A form of claim-staking practised in some jurisdictions whereby claims are staked by drawing lines around the claim on claim maps at a government office.
A metamorphic rock derived from the recrystallization of limestone under intense heat and pressure.
Cash deposited with a broker as partial payment of the purchase price for any type of listed stock. The stock is held by the broker as security for the loan.
Marginal deposit
An orebody of minimal profitability.
Market order
An order to buy or sell at the best price available. In absence of any specified price or limit, an order is considered to be at the market.
A product of a smelter, containing metal and some sulphur, which must be refined further to obtain pure metal.

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