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Diorite
An igneous rock formed by the solidification of molten material.
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Return idler
The idler or roller underneath the cover or cover plates on which the conveyor belt rides after the load which it was carrying has been dumped at the head section and starts the return trip toward the foot section.
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Sounding
Knocking on a roof to see whether it is sound and safe to work under.
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Squeeze
The settling, without breaking, of the roof and the gradual upheaval of the floor of a mine due to the weight of the overlying strata.
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Acid neutralization capacity (ANC)
Acid-base accounting involves measurement of the maximum potential acidity (MPA) and the acid neutralizing capacity (ANC), with net acid producing potential (NAPP) calculated as the difference between the two values. The MPA is calculated from the total sulfur content, determined by the Leco furnace method. The ANC represents the inherent acid buffering of the sample. It is determined by the Modified Sobek method in which the sample is reacted with hydrochloric acid (HCl), followed by back-titrating with sodium hydroxide (NaCl) to quantify the unreacted HCl. The acid consumed by the reaction (HCl added minus unreacted HCl) is then expressed as kg H2SO4/t of sample
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