Industry Glossary

Industry Glossary

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Term Definition
To wash gravel, sand or crushed rock samples in order to isolate gold or other valuable metals by their higher density.
A coal mining block that generally comprises one operating unit.
Panic bar
A switch, in the shape of a bar, used to cut off power at the machine in case of an emergency.
Participating interest
A company's interest in a mine, which entitles it to a certain percentage of profits in return for putting up an equal percentage of the capital cost of the project.
(1) A small joint in coal or rock; (2) a layer of rock in a coal seam; (3) a side track or turnout in a haulage road.
The ultimate stage of holding a mineral claim, after which no more assessment work is necessary because all mineral rights have been earned.
The partially decayed plant matter found in swamps and bogs, one of the earliest stages of coal formation.
A coarse-grained, igneous rock, generally coarse, but irregular in texture, and similar to a granite in composition; usually occurs in dykes or veins and sometimes contains valuable minerals.
A marble-sized ball of iron ore fused with clay for transportation and use in steelmaking.
Nickel iron sulphide, the most common nickel ore.
Percentage extraction
The proportion of a coal seam which is removed from the mine. The remainder may represent coal in pillars or coal which is too thin or inferior to mine or lost in mining. Shallow coal mines working under townships, reservoirs, etc., may extract 50%, or less, of the entire seam, the remainder being left as pillars to protect the surface. Under favorable conditions, longwall mining may extract from 80 to 95% of the entire seam. With pillar methods of working, the extraction ranges from 50 to 90% depending on local conditions.
Percussion drill
A drill, usually air powered, that delivers its energy through a pounding or hammering action.
An intrusive igneous rock consisting mainly of olivine.
That which is allowable or permitted. It is most widely applied to mine equipment and explosives of all kinds which are similar in all respects to samples that have passed certain tests of the MSHA and can be used with safety in accordance with specified conditions where hazards from explosive gas or coal dust exist.
As it pertains to mining, a document issued by a regulatory agency that gives approval for mining operations to take place.
A term used to describe the coarse-grained texture of some igneous rocks.
Picket line
A reference line, marked by pickets or stakes, established on a property for mapping and survey purposes.
Pig iron
Crude iron from a blast furnace.
A bridge conveyor.
A block of solid ore or other rock left in place to structurally support the shaft, walls or roof of a mine.

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