Goodquarry Glossary

A form of Horizontal Shaft Impact (HSI) crusher; the main difference being that the hammers are pivoted and are allowed to swing freely within the crushing chamber.

Hammers

The fixed rotors within an impact crusher, also known as beaters, impellors and blow bars.

Hard rock

In the aggregate industry, this refers to indurated rock (rock that is difficult to break) as opposed to unconsolidated deposits.

Hauling

Movement of mineral and waste around a mine or quarry by truck, rather than by conveyor.

Headwaters

The small streams that come together to form a river.

Heritage

historic or cultural associations.

Hertz (Hz)

The number of cycles per second that something vibrates at.

Hoggin

Clayey sand and gravel used as dug as constructional fill or for low-grade purposes, paths etc.

Horizontal Shaft Impact (HSI) crusher

An impact crusher with a horizontal shaft, typically used for coarse (primary and secondary) crushing.

HSI

Horizontal Shaft Impact crusher. This is an impact crusher with a horizontal shaft, typically used for coarse (primary and secondary) crushing.

Hydraulic Gradient

The difference in hydraulic head between any two points (represented by a difference in water level) defines the 'hydraulic gradient' between those points.

Hydraulic Head

'Hydraulic head' is simply the level to which groundwater would rise within an open standpipe (or 'piezometer') inserted into the saturated zone, and is a measure of the pressure that the water is under at that location

Hydrocyclone

Conical machine for the centrifugal aqueous separation and classification of solids and liquids.

Hydrogeological

Study of the relationship between the Earth's water and geological factors (e.g. rock type and structure).

Hydrogeology

Study of the relationship between the Earth's water and geological factors (e.g. rock type and structure).

Hydrology

Study of all waters in and upon the Earth.