Quarry

A quarry is a type of open-pit mine from which rock or minerals are extracted.

Quarries are generally used for extracting building materials, such as dimension stone. Quarries are usually shallower than other types of open-pit mines.

A quarry is often mistaken for other types of open-pit or open-cast mines such as borrow or gravel pits.

Types of rock extracted from quarries include:

Cinder

China Clay

Coquina

Construction aggregate

Granite

Gritstone

Gypsum a mineral

Limestone

Marble

Sandstone

Slate

Quarries in level areas often have special engineering problems for drainage. The Coquina Quarry at the right is excavated to more than sixty feet (18 meters) below sea level. To reduce surface leakage a moat, lined with clay, was constructed around the entire quarry. Ground water that seeps into the pit is pumped up into the moat.

Many quarries fill with water to become ponds or small lakes after abandonment for mining purposes. Others have become landfills.

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