Quarrying businesses extract stone, rock, sand, gravel and other minerals from open pits or quarries. The material is removed using methods suited to the geology and intended use, which can include drilling, blasting, cutting and mechanical excavation. Operations may involve crushing, screening and washing material on site to produce different grades and sizes. Customers can expect products such as crushed stone and aggregate for roads, building foundations, concrete and drainage, as well as sand, gravel, limestone, slate and decorative or building stone. Some quarries supply blocks or slabs for construction and landscaping, or provide services such as contract extraction, processing and delivery. Quarry operators may also manage stockpiles, monitor the effects of their operations and restore worked areas as extraction ends. Availability depends on the local geology and the materials permitted to be worked at each site.