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reworking (n) – any geologic material that has been removed or displaced by
natural agents from its origin and incorporated in a younger formation.
rich in (n) – having valuable resources.
risk (n)-
the likelihood that illness, injury, or even death might result
rock dust machine (n) – a machine that distributes rock dust over the interior
surfaces of a coal mine by means of air to prevent coal dust explosions.
rock splitter (n) – a person who splits rough dimension stone into smaller
units, such as paving blocks, ashlar, or rubble.
roof bolt (n) – a long steel bolt driven into the roof of underground excavations
to support the roof, preventing and limiting the extent of roof falls.
S
safety (n)- the quality of averting or not causing injury, danger or loss.
safety inspector ( n )– an engineer who controls the whole mining process to
be safe for the workers and environment.
shaft (n)- a primary vertical or non-vertical opening through mine strata used
for ventilation or drainage and/or for hoisting of personnel or materials;
connects the surface with underground workings.
shaft mine (n)– an underground mine in which the main entry or access is by
means of a vertical shaft.
shaft pillar (n) – a large area of a ore seam which is left unworked around the
shaft bottom to protect the shaft from damage by subsidence.
shuttle car (n) – a self-discharging truck, used for receiving coal from the
loading or mining machine and transferring it to an underground loading
point, mine railway or belt conveyor system.
silver (n)- metallic chemical element, nearly white, lustrous, soft, very
ductile, malleable and an excellent conductor of heat and electricity.
slope (n)- a belt conveyor incline.