Industry Glossary

Industry Glossary

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Term Definition
Radioactivity
The property of spontaneously emitting alpha, beta or gamma rays by the decay of the nuclei of atoms.
Radon survey
A geochemical survey technique which detects traces of radon gas, a product of radioactivity.
Raise
A secondary or tertiary inclined opening, vertical or near-vertical opening driven upward form a level to connect with the level above, or to explore the ground for a limited distance above one level.
Rake
The trend of an orebody along the direction of its strike.
Ramp
A secondary or tertiary inclined opening, driven to connect levels, usually driven in a downward direction, and used for haulage.
Rare earth elements
Relatively scarce minerals such as niobium and yttrium.
Reaming shell
A component of a string of rods used in diamond drilling, it is set with diamonds and placed between the bit and the core barrel to maintain the gauge (or diameter) of the hole.
Reclamation
The restoration of land and environmental values to a surface mine site after the coal is extracted. Reclamation operations are usually underway as soon as the coal has been removed from a mine site. The process includes restoring the land to its approximate original appearance by restoring topsoil and planting native grasses and ground covers.
Reconnaissance
A preliminary survey of ground.
Record date
The date by which a shareholder must be registered on the books of a company in order to receive a declared dividend, or to vote on company affairs.
Recovery
The percentage of valuable metal in the ore that is recovered by metallurgical treatment.
Red dog
A nonvolatile combustion product of the oxidation of coal or coal refuse. Most commonly applied to material resulting from in situ, uncontrolled burning of coal or coal refuse piles. It is similar to coal ash.
Refractory ore
Ore that resists the action of chemical reagents in the normal treatment processes and which may require pressure leaching or other means to effect the full recovery of the valuable minerals.
Regional metamorphism
Metamorphism caused by both the heat of igneous processes and tectonic pressure.
Regulator
Device (wall, door) used to control the volume of air in an air split.
Replacement ore
Ore formed by a process during which certain minerals have passed into solution and have been carried away, while valuable minerals from the solution have been deposited in the place of those removed.
Reserve
That portion of the identified coal resource that can be economically mined at the time of determination. The reserve is derived by applying a recovery factor to that component of the identified coal resource designated as the reserve base.
Resin bolting
A method of permanent roof support in which steel rods are grouted with resin.
Resistivity survey
A geophysical technique used to measure the resistance of a rock formation to an electric current.
Resources
Concentrations of coal in such forms that economic extraction is currently or may become feasible. Coal resources broken down by identified and undiscovered resources. Identified coal resources are classified as demonstrated and inferred. Demonstrated resources are further broken down as measured and indicated. Undiscovered resources are broken down as hypothetical and speculative.

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