Aggregate – Any of several hard materials such as crushed rock, sand, gravel, stone, slag, cinders or other inactive materials.

Asphalt – A brown or black tarlike substance mixed with sand or gravel and used for paving, roofing, etc.

Ballast – Gravel or broken rock placed in a railroad bed.

Cement – A powdered substance of lime and clay, mixed with water and sand to make mortar (an adhesive) or with water, sand and gravel to make concrete.

Crusher – A machine that breaks rock into smaller pieces by crushing it like a jaw or spinning it in a circular motion at high speeds.

Granite – A hard rock consisting chiefly of feldspar and quartz.

Gravel – A loose mixture of pebbles and rock fragments that are coarser than sand.

Greensite – A parcel of undeveloped land designated for quarrying.

Limestone – A sedimentary rock composed of calcium carbonate, formed by the accumulation and recrystallization of seashells which have gone through some degree of change so that the shells are not identifiable.

Muck Pile – Blasted rock in the pit, which is ready to be taken to the primary crusher.

Ready Mixed Concrete – A hard building material made of sand and gravel, bonded together with cement.

Riprap – Large pieces of rock (usually 6 to 30 inches in diameter) which have undergone only primary crushing and sizing, or larger, uncrushed pieces. Riprap is used to stabilize slopes and shorelines and construct erosion-control structures.

Sand – Loose, gritty grains of disintegrated rock, as on beaches, in deserts, etc.

Screen Media – A wire mesh screen used for sizing stone in the processing plant.