Quarry
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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.
Problems
Quarries in level areas often have special engineering problems for drainage. The Coquina Quarry is excavated to more than 60 feet (18 m) 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 after abandonment and become lakes. Others are made into landfills.
Types of rock
Types of rock extracted from quarries include:
- Cinder
- Chalk
- China Clay
- Clay
- Coal
- Coquina
- Construction aggregate (sand and gravel)
- Globigerina Limestone (Malta)
- Granite
- Gritstone
- Gypsum
- Limestone
- Marble
- Ores
- Phosphate rock
- Sandstone
- Slate
See also
Wikimedia Commons has media related to Quarries.
- Coal mining
- Clay pit
- Collecting fossils
- Gravel pit
- Kouloura
- List of minerals
- List of rock types
- List of stones
- Miner
- Mountaintop removal mining
External links
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